These are representative sample records from Science.gov related to your search topic.
For comprehensive and current results, perform a real-time search at Science.gov.
1

Public service satellite communications  

NASA Technical Reports Server (NTRS)

It is suggested that the high effective isotropic radiated power provided by high-power satellite transmitters and high-gain antennas could be used in conjunction with economical ground receivers to furnish public services in remote areas of the U.S. Applications to health care, education and public safety are mentioned. A system concept involving a communications satellite operating in the Ku-band (12-GHz down, 14-GHz up) and either 100/30 watt stationary earth terminals with 1-1.8 m antennas or mobile terminals with omnidirectional antennas is presented.

Wolff, E. A.

1978-01-01

2

Satellite communication for public services  

NASA Technical Reports Server (NTRS)

Public service programs using NASA's ATS-6 and CTS satellites are discussed. Examples include the ATS-6 Health and Education Telecommunications experimental program and the use of CTS to enable students in one university to take courses presented at another distant university. Possible applications of satellite communication systems to several areas of public service are described, and economic and political obstacles hindering the implementation of these programs are considered. It is suggested that a federally sponsored program demonstrating the utility of satellites accomodating a large number of small terminals is needed to encourage commercial satellite operations.

Cooper, R. S.; Redisch, W. N.

1977-01-01

3

A public service communications satellite user brochure  

NASA Technical Reports Server (NTRS)

The capabilities of a proposed communications satellite that would be devoted to experiments and demonstrations of various public services is described. A Public Service Communications Satellite study was undertaken at the NASA Goddard Space Flight Center (GSFC) to define the problems and opportunities of a renewed NASA role and the form such NASA involvement should take. The concept that has evolved has resulted from careful consideration of experiments that were already undertaken on existing satellites.

1977-01-01

4

Communication Satellites: Experimental & Operational, Commercial & Public Service.  

ERIC Educational Resources Information Center

The title reflects the first and major article in an issue of this newsletter devoted entirely to communication satellites. This series of articles on the potential and applications of communication satellites in development projects is concerned with their development for commercial and public service, development in the Pacific region, SPACECOM…

Development Communication Report, 1979

1979-01-01

5

Servicing communication satellites in geostationary orbit  

NASA Technical Reports Server (NTRS)

The econmic benefits of a LEO space station are quantified by identifying alternative operating scenarios utilizing the space station's transportation facilities and assembly and repair facilities. Particular consideration is given to the analysis of the impact of on-orbit assembly and servicing on a typical communications satellite is analyzed. The results of this study show that on-orbit servicing can increase the internal rate of return by as much as 30 percent.

Russell, Paul K.; Price, Kent M.

1990-01-01

6

Mobile satellite communications in the Forest Service  

NASA Technical Reports Server (NTRS)

There are usually some places within a forest that do not have adequate communication coverage due to line-of-sight or other reasons. These areas are generally known by the foresters and radio technicians and allowances are made for that when working or traveling in those areas. However, when wildfire or other emergencies occur, communications are vital because wildfires can require hundreds of firefighters and cover thousands of acres. During these emergency operations, the existing communications are not adequate and complete radio systems are moved into the area for the conduct of fire communications. Incident command posts (ICPs) and fire camps are set up in remote locations and there is constant need for communications in the fire area and to agency headquarters and dispatch offices. Mobile satellite communications would be an ideal supplement to the Forest Service's current communications system in aiding forest fire control activities.

Warren, John R.

1988-01-01

7

Communication satellite services for special purpose users  

NASA Technical Reports Server (NTRS)

The present study identifies potential satellite services, examines the technology necessary for efficient implementation of these services, and determines minimum service cost versus user network size. The generic satellite services evaluated comprise TV and radio distribution (for retransmission), video teleconferencing (interactive), audio/facsimile teleconferencing (interactive), multiplexed data/voice (point-to-point), and satellite-supported land mobile. Satellite costs are based on extrapolations from ongoing commercial satellite programs. Production methods, new technology, and effect of production quantities on present and future production costs are examined to provide information on earth station equipment cost versus the variable 'buy'. Six different launch vehicles from a Delta 2914 to a dedicated Shuttle and three frequency bands and both broadcast (no eclipse capability) and fixed service satellites are considered to assess the effect of satellite size on cost and performance. It is assumed that the user pays only for his prorata share of the space segment costs.

Wright, D. L.; Kiesling, J. D.

1977-01-01

8

USDA Forest Service mobile satellite communications applications  

NASA Technical Reports Server (NTRS)

The airborne IR signal processing system being developed will require the use of mobile satellite communications to achieve its full capability and improvement in delivery timeliness of processed IR data to the Fire Staff. There are numerous other beneficial uses, both during wildland fire management operations or in daily routine tasks, which will also benefit from the availability of reliable communications from remote areas.

Warren, John R.

1990-01-01

9

Mobile satellite service communications tests using a NASA satellite  

NASA Technical Reports Server (NTRS)

Emerging applications of commercial mobile satellite communications include satellite delivery of compact disc (CD) quality radio to car drivers who can select their favorite programming as they drive any distance; transmission of current air traffic data to aircraft; and handheld communication of data and images from any remote corner of the world. Experiments with the enabling technologies and tests and demonstrations of these concepts are being conducted before the first satellite is launched by utilizing an existing NASA spacecraft.

Chambers, Katherine H.; Koschmeder, Louis A.; Hollansworth, James E.; ONeill, Jack; Jones, Robert E.; Gibbons, Richard C.

1995-01-01

10

Satellite Communication.  

ERIC Educational Resources Information Center

Presents a discussion of communication satellites: explains the principles of satellite communication, describes examples of how governments and industries are currently applying communication satellites, analyzes issues confronting satellite communication, links mathematics and science to the study of satellite communication, and applies…

Technology Teacher, 1985

1985-01-01

11

Emerging markets for satellite data communications in the public service  

NASA Technical Reports Server (NTRS)

The paper discusses some of the current and potential markets for satellite data communications as projected by the Public Service Satellite Consortium (PSSC). Organizations in the public service sector are divided into three categories, depending on their expected benefits and organizational changes due to increased satellite telecommunications use: A - modest institutional adjustments are necessary and significant productivity gains are likely; B - institutional requirements picture is promising, but more information is needed to assess benefits and risk; and C - major institutional adjustments are needed, risks are high but possible benefits are high. These criteria are applied to the U.S. health care system, continuing education, equipment maintenance, libraries, environmental monitoring, and other potential markets. The potential revenues are seen to be significant, but what is needed is a cooperative effort by common carriers and major public service institutions to aggregate the market.

Potter, J. G.

1978-01-01

12

Developing satellite communications for public service: Prospects in four service areas  

NASA Technical Reports Server (NTRS)

The Public Service Satellite Consortium evaluated prospects for satellite telecommunications in four areas of the public service: the U.S. health care system, elementary and secondary education, American libraries, and that sector of the public service which is concerned with the provision of continuing education to health professionals. Three important conclusions were reached. First, throughout the public service there are three recurring needs: improved access, cost containment, and maintenance of quality. Appropriate application of communication satellite systems could ameliorate each of these concerns. Second, there appears to be an enormous latent demand for data communication services throughout the public service. The potential demand in 1982 to support requirements in hospital administration, library services and other information-retrieval activities, equipment maintenance, and environmental monitoring may be in excess of $300 million a year. Third, administrative applications of data communication networks show particular promise, especially in rural areas.

1977-01-01

13

Provision of Electronic Healthcare Services via DVB-RCS Satellite Communication Technology  

E-print Network

Provision of Electronic Healthcare Services via DVB-RCS Satellite Communication Technology V. Satellite broadband communications technologies, such as the Digital Video Broadcasting with Return Channel of Information and Communication Systems Engineering, University of the Aegean, Karlovasi 83200, Samos, Greece, e

Vouyioukas, Demosthenes

14

Public service communications satellite. [health, education, safety and information transfer applications  

NASA Technical Reports Server (NTRS)

Health, education, public safety, and information transfer applications of public service communications satellites are discussed with particular attention to the use of communications satellites to improve rural health delivery. Health-care communications requirements are summarized. The communications system concept involves small inexpensive stationary, portable, and moving ground terminals which will provide communications between any two points in the U.S. with both fixed and moving terminals on a continuous 24-hour basis. User requirements, wavebands, and privacy techniques are surveyed.

Wolff, E. A.

1978-01-01

15

Satellite communications experiment for the Ontario air ambulance service  

NASA Technical Reports Server (NTRS)

A satellite communications experiment was conducted to develop a reliable voice communications system between paramedics and doctors at certain larger medical centers. The experiment used INMARSAT's Atlantic Ocean Region satellite which provides coverage to the western border of Ontario. Forward downlink power from the satellite is in great demand, so two highly power-efficient modulation schemes were chosen for evaluation during the experiment. These were amplitude-companded single-sideband (ACSSB) and linear predictive coding in conjunction with DMSK modulation. Good performance with a signal to noise ratio of about 10 dB was demonstrated from many parts of the province with the evevation angle to the satellite ranging from five to twenty degrees and with the aircraft both in-flight and on the runway.

Butterworth, John S.

1988-01-01

16

Satellite provided fixed communications services: A forecast of potential domestic demand through the year 2000: Volume 2: Main text  

NASA Technical Reports Server (NTRS)

Potential satellite-provided fixed communications services, baseline forecasts, net long haul forecasts, cost analysis, net addressable forecasts, capacity requirements, and satellite system market development are considered.

Kratochvil, D.; Bowyer, J.; Bhushan, C.; Steinnagel, K.; Kaushal, D.; Al-Kinani, G.

1983-01-01

17

The application of mobile satellite services to emergency response communications  

NASA Technical Reports Server (NTRS)

The application of an integrated satellite/terrestrial emergency response communications system in disaster relief operations is discussed. Large area coverage communications capability, full-time availability, a high degree of mobility, plus reliability, are pointed out as criteria for an effective emergency communications system. Response time is seen as a major factor determining the possible survival and/or protection of property. These criteria, can not be met by existing communications systems and complete blackouts were experienced during the past decades caused by either interruption or destruction of existing power lines, and overload or inadequacy of remaining lines. Several emergency cases, caused by either hurricanes, tornados, or floods, during which communication via satellite was instrumental to inform rescue and relief teams, are described in detail. Seismic Risk Maps and charts of Major Tectonic Plates Earthquake Epicenters are given, and it is noted that, 35 percent of the U.S. population is living in critical areas. National and international agreements for the implementation of a satellite-aided global Search and Rescue Program is mentioned. Technological and economic breakthroughs are still needed in large multibeam antennas, switching circuits, and low cost mobile ground terminals. A pending plan of NASA to initiate a multiservice program in 1982/83, with a Land Mobile Satellite capability operating in the 806 - 890 MHz band as a major element, may help to accelerate the needed breakthroughs.

Freibaum, J.

1980-01-01

18

Satellite applications to electric-utility communications needs. [land mobile satellite service  

NASA Technical Reports Server (NTRS)

Significant changes in the Nation's electric power systems are expected to result from the integration of new technology, possible during the next decade. Digital communications for monitor and control, exclusive of protective relaying, are expected to double or triple current traffic. A nationwide estimate of 13 Mb/s traffic is projected. Of this total, 8 Mb/s is attributed to the bulk-power system as it is now being operated (4 Mb/s). This traffic could be accommodated by current communications satellites using 3- to 4.5-m-diameter ground terminals costing $35,000 to $70,000 each. The remaining 5-Mb/s traffic is attributed to new technology concepts integrated into the distribution system. Such traffic is not compatible with current satellite technology because it requires small, low-cost ground terminals. Therefore, a high effective isotropic radiated power satellite, such as the one being planned by NASA for the Land Mobile Satellite Service, is required.

Horstein, M.; Barnett, R.

1981-01-01

19

Preliminary benefits study for a public service communications satellite system: Task order 2  

NASA Technical Reports Server (NTRS)

The economic and social benefits to accrue from an operational public service communications satellite system are estimated for the following applications: teleradiology, emergency medical services, teleconferencing for both civilian and defense agencies, data transfer, remote cardiac monitoring, teleconsultation, continuing education for professionals, and severe storm warning. The potential impact of improved communication on the cost and quality of services are assessed for various agencies, professions, and industries.

1978-01-01

20

Use of communications. [satellite communication  

NASA Technical Reports Server (NTRS)

Progress in the field of satellite communications is reviewed, and useful services which may be provided by future satellite communications systems are considered. Recommendations are made with regard to mobile communications for use on land and at sea, position determination, mineral and energy exploration, the possibility of using electronic means to assist in main delivery, education and health-care experiments, and the use of satellite telecommunications to enhance the quality of life in rural areas by making available a full range of educational and entertainment programs. The needs of the amateur radio community are also considered.

1975-01-01

21

Advanced communications satellite systems  

NASA Technical Reports Server (NTRS)

There is a rapidly growing demand for satellite circuits, particularly for domestic service within the U.S. NASA's current program is aimed at developing the high risk, advanced satellite communications technologies required to significantly increase the capacity of future satellite communications systems. Attention is given to aspects of traffic distribution and service scenario, problems related to effects of rain attenuation, details regarding system configuration, a 30/20 GHz technology development approach, an experimental flight system, the communications payload for the experimental flight system, a typical experiment flight system coverage, and a typical three axis stabilized flight spacecraft.

Sivo, J. N.

1983-01-01

22

The Role of Satellites in Personal Communication Services  

Microsoft Academic Search

This paper aims at providing a complete analysis of the issues relevant to satellite systems in the perspective of the third generation of mobile systems. The analysis considers, on the one hand, the possible satellite system evolutionary paths and, on the other hand, the satellite system requirements related to technological issues. As regards the satellite evolutionary paths, the paper provides

Fulvio Ananasso; Francesco Delli Priscoli

1995-01-01

23

Satellite/Terrestrial Networks: End-to-End Communication Interoperability Quality of Service Experiments  

NASA Technical Reports Server (NTRS)

Various issues associated with satellite/terrestrial end-to-end communication interoperability are presented in viewgraph form. Specific topics include: 1) Quality of service; 2) ATM performance characteristics; 3) MPEG-2 transport stream mapping to AAL-5; 4) Observation and discussion of compressed video tests over ATM; 5) Digital video over satellites status; 6) Satellite link configurations; 7) MPEG-2 over ATM with binomial errors; 8) MPEG-2 over ATM channel characteristics; 8) MPEG-2 over ATM over emulated satellites; 9) MPEG-2 transport stream with errors; and a 10) Dual decoder test.

Ivancic, William D.

1998-01-01

24

Satellite Communications for ATM  

NASA Technical Reports Server (NTRS)

This presentation is an overview on Satellite Communication for the Aeronautical Telecommunication Management (ATM) research. Satellite Communications are being considered by the FAA and NASA as a possible alternative to the present and future ground systems supporting Air Traffic Communications. The international Civil Aviation Organization (ICAO) have in place Standards and Recommended Practices (SARPS) for the Aeronautical Mobile Satellite Services (AMSS) which is mainly derived from the pre-existing Inmarsat service that has been in service since the 1980s. The Working Group A of the Aeronautical Mobile Communication Panel of ICAO has also been investigating SARPS for what is called the Next Generation Satellite Service (NGSS) which conforms less to the Inmarsat based architecture and explores wider options in terms of satellite architectures. Several designs are being proposed by Firms such as Boeing, ESA, NASA that are geared toward full or secondary usage of satellite communications for ATM. Satellite communications for ATM can serve several purposes ranging from primary usage where ground services would play a minimal backup role, to an integrated solution where it will be used to cover services, or areas that are less likely to be supported by the proposed and existing ground infrastructure. Such Integrated roles can include usage of satellite communications for oceanic and remote land areas for example. It also can include relieving the capacity of the ground network by providing broadcast based services of Traffic Information Services messages (TIS-B), or Flight Information Services (FIS-B) which can take a significant portion of the ground system capacity. Additionally, satellite communication can play a backup role to support any needs for ground replacement, or additional needed capacity even after the new digital systems are in place. The additional bandwidth that can be provided via satellite communications can also open the door for many new applications that generally will enhance the standard services provided. All of those possibilities were investigated and comments, as well as descriptions of those analyses are put forward, as well as suggestions for future areas of study.

Shamma, Mohammed A.

2003-01-01

25

An approach to effective UHF (S/L band) data communications for satellite Personal Communication Service (PCS)  

NASA Technical Reports Server (NTRS)

Reliable signaling information transfer is fundamental in supporting the needs of data communication PCS via LMS (Land Mobile Service) SSs (satellite systems). The needs of the system designer can be satisfied only through the collection of media information that can be brought to bear on the pertinent design issues. We at ISI hope to continue our dialogue with fading media experts to address the unique data communications needs of PCS via LMS SSs.

Hayase, Joshua Y.

1995-01-01

26

Videoconferencing services via satellite  

NASA Astrophysics Data System (ADS)

Videoconferencing services in general are discussed with special attention being given to satellite use. The always increasing internationalization of professional activities stimulates the demand for novel and flexible communication media. Videoconferencing is such a promising medium, for which the technology is rapidly maturing. An introductory analysis of human to human communication and its practical problems is presented, as a framework for deriving generic user requirements. The subject of videoconferencing services via satellite is approached both from the user's and from the service provider's perspective. A practical implementation of a videoconferencing network via satellite is described.

Desonville, E.

1991-10-01

27

47 CFR 25.279 - Inter-satellite service.  

Code of Federal Regulations, 2011 CFR

...Section 25.279 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations § 25.279 Inter-satellite service. (a) Any satellite...

2011-10-01

28

47 CFR 25.279 - Inter-satellite service.  

Code of Federal Regulations, 2010 CFR

...Section 25.279 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations § 25.279 Inter-satellite service. (a) Any satellite...

2010-10-01

29

47 CFR 25.279 - Inter-satellite service.  

Code of Federal Regulations, 2013 CFR

...Section 25.279 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations § 25.279 Inter-satellite service. (a) Any satellite...

2013-10-01

30

47 CFR 25.279 - Inter-satellite service.  

Code of Federal Regulations, 2012 CFR

...Section 25.279 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations § 25.279 Inter-satellite service. (a) Any satellite...

2012-10-01

31

47 CFR 25.279 - Inter-satellite service.  

Code of Federal Regulations, 2014 CFR

...Section 25.279 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations § 25.279 Inter-satellite service. (a) Any satellite...

2014-10-01

32

Radio determination satellite service  

NASA Astrophysics Data System (ADS)

The capabilities and measured performance of a geosynchronous satellite-based service called the radio determination satellite service (RDSS), which operates at radio frequencies allocated by the International Telecommunications Union (ITU) and is licensed in the United States by the Federal Communications Commission (FCC), are discussed. Plans for both improvement in capability and expansion to nearly global coverage are described. Since RDSS can also provide radio navigation, some comparisons of this service with the Global Positioning System (GPS) are made.

Briskman, Robert D.

1990-07-01

33

Study of spread spectrum multiple access systems for satellite communications with overlay on current services  

NASA Technical Reports Server (NTRS)

The feasibility of using spread spectrum techniques to provide a low-cost multiple access system for a very large number of low data terminals was investigated. Two applications of spread spectrum technology to very small aperture terminal (VSAT) satellite communication networks are presented. Two spread spectrum multiple access systems which use a form of noncoherent M-ary FSK (MFSK) as the primary modulation are described and the throughput analyzed. The analysis considers such factors as satellite power constraints and adjacent satellite interference. Also considered is the effect of on-board processing on the multiple access efficiency and the feasibility of overlaying low data rate spread spectrum signals on existing satellite traffic as a form of frequency reuse is investigated. The use of chirp is examined for spread spectrum communications. In a chirp communication system, each data bit is converted into one or more up or down sweeps of frequency, which spread the RF energy across a broad range of frequencies. Several different forms of chirp communication systems are considered, and a multiple-chirp coded system is proposed for overlay service. The mutual interference problem is examined in detail and a performance analysis undertaken for the case of a chirp data channel overlaid on a video channel.

Ha, Tri T.; Pratt, Timothy

1989-01-01

34

Telelibrary: Library Services via Satellite.  

ERIC Educational Resources Information Center

Investigates the provision of library services via satellite, explains briefly the operation and advantages of communication satellites, and discusses the various telecommunications equipment and services which, when coupled with satellite transmission, will enhance library activities. Demand trend projections for telecommunications services

Liu, Rosa

1979-01-01

35

The FAA satellite communications program  

NASA Technical Reports Server (NTRS)

The Federal Aviation Administration is developing satellite communications capabilities to enhance air traffic services, first in oceanic and remote regions, and later for United States domestic services. The program includes four projects which develop technical standards, assure adequate system performance, support implementation, and provide for research and development for selected areas of U.S. domestic satellite communications. The continuing focus is the application of automated data communications, which is already permitting enhanced and regular position reporting. Voice developments, necessary for non-routine communications, are also included among the necessary activities to improve ATC communications.

Burcham, Karen L.

1993-01-01

36

Equalizers for communications satellites  

E-print Network

This thesis investigates equalization for advanced protected satellite communications systems in development at MIT Lincoln Laboratory. Equalizers facilitate high data rate communication by correcting dispersion in the ...

Fay, Leon

2008-01-01

37

Communications satellite systems capacity analysis  

NASA Technical Reports Server (NTRS)

Analog and digital modulation techniques are compared with regard to efficient use of the geostationary orbit by communications satellites. Included is the definition of the baseline systems (both space and ground segments), determination of interference susceptibility, calculation of orbit spacing, and evaluation of relative costs. It is assumed that voice or TV is communicated at 14/11 GHz using either FM or QPSK modulation. Both the Fixed-Satellite Service and the Broadcasting-Satellite Service are considered. For most of the cases examined the digital approach requires a satellite spacing less than or equal to that required by the analog approach.

Browne, L.; Hines, T.; Tunstall, B.

1982-01-01

38

Communications technology satellite  

NASA Technical Reports Server (NTRS)

A description of the Communications Technology Satellite (CTS), its planned orbit, its experiments, and associated ground facilities was given. The communication experiments, to be carried out by a variety of groups in both the United States and Canada, include tele-education, tele-medicine, community interaction, data communications and broadcasting. A historical summary of communications satellite development was also included.

1976-01-01

39

Advanced Communications Technology Satellite (ACTS)  

NASA Technical Reports Server (NTRS)

The NASA Advanced Communications Technology Satellite (ACTS) was conceived to help maintain U.S. leadership in the world's communications-satellite market. This experimental satellite is expected to be launched by NASA in 1992 and to furnish the technology necessary for establishing very small aperture terminal digital networks which provide on-demand full-mesh connectivity, and 1.544-MBPS services with only a single hop. Utilizing on-board switching and processing, each individual voice or data circuit can be separately routed to any location in the network. This paper provides an overview of the ACTS and discusses the value of the technology for future communications systems.

Gedney, Richard T.; Schertler, Ronald J.

1989-01-01

40

76 FR 79110 - Service Rules and Policies for the Broadcasting Satellite Service (BSS)  

Federal Register 2010, 2011, 2012, 2013, 2014

...FEDERAL COMMUNICATIONS COMMISSION 47 CFR Part...Policies for the Broadcasting Satellite Service (BSS) AGENCY: Federal Communications Commission. ACTION...Policies for the Broadcasting Satellite Service (BSS),...

2011-12-21

41

47 CFR 25.225 - Geographic Service Requirements for 17/24 GHz Broadcasting Satellite Service.  

Code of Federal Regulations, 2013 CFR

...Requirements for 17/24 GHz Broadcasting Satellite Service. 25.225 Section 25.225 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2013-10-01

42

47 CFR 25.225 - Geographic Service Requirements for 17/24 GHz Broadcasting Satellite Service.  

Code of Federal Regulations, 2012 CFR

...Requirements for 17/24 GHz Broadcasting Satellite Service. 25.225 Section 25.225 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2012-10-01

43

47 CFR 25.225 - Geographic Service Requirements for 17/24 GHz Broadcasting Satellite Service.  

Code of Federal Regulations, 2011 CFR

...Requirements for 17/24 GHz Broadcasting Satellite Service. 25.225 Section 25.225 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2011-10-01

44

47 CFR 25.225 - Geographic Service Requirements for 17/24 GHz Broadcasting Satellite Service.  

Code of Federal Regulations, 2010 CFR

...Requirements for 17/24 GHz Broadcasting Satellite Service. 25.225 Section 25.225 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2010-10-01

45

47 CFR 25.225 - Geographic Service Requirements for 17/24 GHz Broadcasting Satellite Service.  

Code of Federal Regulations, 2014 CFR

...Requirements for 17/24 GHz Broadcasting Satellite Service. 25.225 Section 25.225 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2014-10-01

46

IRIDIUM(R) aeronautical satellite communications  

Microsoft Academic Search

The ever-increasing demand to stay in touch, to be able to communicate anywhere and anytime, has created a market for Low Earth Orbit (LEG) satellite communications services such as the Iridium System. The Iridium satellite communications network is being developed to support the needs of the passenger, the cabin crew and the flight crew. Iridium Communications LLC owns a network

P. W. Lemme; S. M. Glenister; A. W. Miller

1998-01-01

47

Domestic Communications Satellites.  

ERIC Educational Resources Information Center

The June, 1972 Federal Communications Commission's (FCC) decision allowed an "open skies" policy in regard to domestic communication satellites and raised Liberal opposition to a situation where exclusive and unchecked communications power is now in the hands of private entrepreneurs, primarily the big Defense Department oriented aerospace…

Network Project Notebook, 1972

1972-01-01

48

Experiment In Aeronautical-Mobile/Satellite Communication  

NASA Technical Reports Server (NTRS)

Report describes study of performance of digital mobile/satellite communication terminals of advanced design intended for use in ground stations and airplanes in aeronautical-mobile service. Study was collaboration of NASA, Federal Aviation Administration (FAA), Communications Satellite Corp. (COMSAT), and International Maritime Satellite System (INMARSAT).

Jedrey, Thomas C.; Lay, Norman E.; Dessouky, Khaled

1992-01-01

49

Realizing Future Broadband Satellite Network Services  

E-print Network

@cis.ohio-state.edu ABSTRACT Future satellite communication systems proposed use geosynchronous (GEO) satellites, medium earth challenges before telecommunications industry in the 21st century. Satellite communication networks canRealizing Future Broadband Satellite Network Services Sastri Kota Arjan Durresi, Raj Jain Lockheed

Jain, Raj

50

Advanced Communications Technology Satellite (ACTS)  

NASA Technical Reports Server (NTRS)

The NASA Advanced Communications Technology Satellite (ACTS) provides high risk technologies having the potential to dramatically enhance the capabilities of the satellite communications industry. This experimental satellite, which will be launched by NASA in 1993, will furnish the technology necessary for providing a range of services. Utilizing the ACTS very-high-gain-hopping spot-beam antennas with on-board routing and processing, Very Small Aperture Terminal (VSAT) digital networks which provide on-demand, full-mesh-convectivity 1.544-MBPS services with only a single hop can be established. The high-gain spot-beam antenna at Ka-band permits wide area, flexible networks providing high data rate services between modest-size earth terminals.

Plecity, Mark S.; Nall, Mark E.

1991-01-01

51

Iridium(R) aeronautical satellite communications  

Microsoft Academic Search

The ever-increasing demand to stay in touch, to be able to communicate anywhere and anytime, has created a market for low Earth orbit (LEO) satellite communications services such as the Iridium system. The Iridium satellite communications network is being developed to support the needs of the passenger, the cabin crew and the flight crew for: aeronautical public correspondence (APC); aeronautical

P. W. Lemme; S. M. Glenister; A. W. Miller

1999-01-01

52

78 FR 19172 - Earth Stations Aboard Aircraft Communicating with Fixed-Satellite Service Geostationary-Orbit...  

Federal Register 2010, 2011, 2012, 2013, 2014

...CFR Parts 2 and 25 [IB Docket No. 12-376; FCC 12-161] Earth Stations Aboard Aircraft Communicating with Fixed-Satellite...Register of March 8, 2013. The document proposed rules for Earth Stations Aboard Aircraft. FOR FURTHER INFORMATION...

2013-03-29

53

Domestic Communication Satellites  

ERIC Educational Resources Information Center

A discussion of the Federal Communications Commission's new policy on domestic satellites in light of our 1) military and economic history; 2) corporate interests; 3) citizen surveillance; and 4) media control. (HB)

Horowitz, Andrew

1974-01-01

54

Communication satellite antennas  

Microsoft Academic Search

During the previous two decades, communication satellites have developed from the pioneering Telstar to the highly sophisticated ATS-6. Concurrrently, the spacecraft antennas have developed from a low-gain \\

LEON J. RICARDI

1977-01-01

55

Satellite-Based Educational Services. Technical Memorandum.  

ERIC Educational Resources Information Center

This memorandum contains engineering information relevant to the use of communication satellites for educational purposes. Information is provided for ground terminals as well as satellites. Satellite related issues addressed include: (1) expected life of service of various satellites, (2) constraints on the availability of the satellites, (3)…

Operations Research, Inc., Silver Spring, MD.

56

Efficient Packet Satellite Communications  

Microsoft Academic Search

This paper gives an extensive analysis of a Packet satellite (PACSAT) communications system that uses a digital processing satellite in a packet data network. It is shown that multiple uplinks coupled with on-board switching and storage can provide significant gains in throughput, efficiency, and margin against instability. Design tradeoffs are presented and the theoretical results are verified by extensive computer

JOSEPH K. DEROSA; LAWRENCE H. OZAROW; LESLIE N. WEINER

1979-01-01

57

Mobile satellite communications  

Microsoft Academic Search

The paper presents an up-to-date overview as well as new results on mobile satellite communications. Specifically, the following subjects are addressed: worldwide activities; satellite orbits; multiple access techniques; Novstar global positioning system; economic and regulatory issues; future trends. Some of these technical and nontechnical subjects appeal disjoint, but they are unique and significant among the many facets, which effect the

W. W. Wu; E. F. Miller; W. L. Pritchard; R. L. Pickholtz

1994-01-01

58

Signals from Communications Satellites.  

ERIC Educational Resources Information Center

Discusses the Doppler effect for relative motion between a source of waves and an observer and the orbital dynamics of communications satellites. Presents preliminary calculations of the satellite's altitude and linear velocity using only the concepts of the Doppler shift and the mechanics of motion in a circular path. (JRH)

Thomsen, Volker

1996-01-01

59

75 FR 13085 - Pan-Pacific Education and Communications Experiments by Satellite (PEACESAT): Closing Date  

Federal Register 2010, 2011, 2012, 2013, 2014

...Program's acquisition of satellite communications to service Pacific Basin...Program's acquisition of satellite communications to service Pacific Basin...Stat. 2758) to acquire satellite communications services to provide...

2010-03-18

60

The 18 and 30 GHz fixed service communications satellite system study. [to determine the cost and performance characteristics  

NASA Technical Reports Server (NTRS)

The use of the 18 and 30 GHz bands for fixed service satellite communications is examined. The cost and performance expected of 18 and 30 GHz hardware is assessed, selected trunking and direct to user concepts are optimized, and the cost of these systems are estimated. The effect of rain attenuation on the technical and economic viability of the system and methods circumventing the problem are discussed. Technology developments are investigated and cost estimates of these developments are presented.

Bronstein, L. M.

1979-01-01

61

Demand for satellite-provided domestic communications services up to the year 2000  

NASA Technical Reports Server (NTRS)

Three fixed service telecommunications demand assessment studies were completed for NASA by The Western Union Telegraph Company and the U.S. Telephone and Telegraph Corporation. They provided forecasts of the total U.S. domestic demand, from 1980 to the year 2000, for voice, data, and video services. That portion that is technically and economically suitable for transmission by satellite systems, both large trunking systems and customer premises services (CPS) systems was also estimated. In order to provide a single set of forecasts a NASA synthesis of the above studies was conducted. The services, associated forecast techniques, and data bases employed by both contractors were examined, those elements of each judged to be the most appropriate were selected, and new forecasts were made. The demand for voice, data, and video services was first forecast in fundamental units of call-seconds, bits/year, and channels, respectively. Transmission technology characteristics and capabilities were then forecast, and the fundamental demand converted to an equivalent transmission capacity. The potential demand for satellite-provided services was found to grow by a factor of 6, from 400 to 2400 equivalent 36 MHz satellite transponders over the 20-year period. About 80 percent of this was found to be more appropriate for trunking systems and 20 percent CPS.

Stevenson, S.; Poley, W.; Lekan, J.; Salzman, J. A.

1984-01-01

62

Results of thin-route satellite communication system analyses including estimated service costs  

NASA Technical Reports Server (NTRS)

Ways for determining optimum satellite and terrestrial system architectures and parameters for providing the most economical telephone service to remote areas of the U.S. are explored. Several configurations for an isolated rural telephone system, covering all the states plus Alaska, employing satellites is considered. Both direct-to-the-user and community-type of systems are evaluated using UHF and Ku-band RF equipment for the rural/satellite links. The effect of multiple spot beams, outage, signal quality, modulation method, satellite accessing, forward error correction, and the number of users are also evaluated. The total cost for a 5-minute call from an isolated rural user to a TELCO user was shown to be as low as $1.30 for a system with 1.8 X 10 to the sixth rural users.

Wright, D. L.

1979-01-01

63

Experimental Satellite Quantum Communications  

E-print Network

Quantum Communications on planetary scale require complementary channels including ground and satellite links. The former have progressed up to commercial stage using fiber-cables, while for satellite links, the absence of terminals in orbit has impaired theirs development. However, the demonstration of the feasibility of such links is crucial for designing space payloads and to eventually enable the realization of protocols such as quantum-key-distribution (QKD) and quantum teleportation along satellite-to-ground or intersatellite links. We demonstrated the faithful transmission of qubits from space to ground by exploiting satellite corner cube retroreflectors acting as transmitter in orbit, obtaining a low error rate suitable for QKD. We also propose a two-way QKD protocol exploiting modulated retroreflectors that necessitates a minimal payload on satellite, thus facilitating the expansion of Space Quantum Communications.

Giuseppe Vallone; Davide Bacco; Daniele Dequal; Simone Gaiarin; Vincenza Luceri; Giuseppe Bianco; Paolo Villoresi

2014-06-16

64

Satellite Communications Using Commercial Protocols  

NASA Technical Reports Server (NTRS)

NASA Glenn Research Center has been working with industry, academia, and other government agencies in assessing commercial communications protocols for satellite and space-based applications. In addition, NASA Glenn has been developing and advocating new satellite-friendly modifications to existing communications protocol standards. This paper summarizes recent research into the applicability of various commercial standard protocols for use over satellite and space- based communications networks as well as expectations for future protocol development. It serves as a reference point from which the detailed work can be readily accessed. Areas that will be addressed include asynchronous-transfer-mode quality of service; completed and ongoing work of the Internet Engineering Task Force; data-link-layer protocol development for unidirectional link routing; and protocols for aeronautical applications, including mobile Internet protocol routing for wireless/mobile hosts and the aeronautical telecommunications network protocol.

Ivancic, William D.; Griner, James H.; Dimond, Robert; Frantz, Brian D.; Kachmar, Brian; Shell, Dan

2000-01-01

65

Coding for Satellite Communication  

Microsoft Academic Search

This paper discusses a number of coding techniques for future satellite communication; they include Reed-Solomon error decoding for message blocks, probabilistic decoding techniques for punctured convolutional codes, and planar Euclidean geometry difference set codes for random multiple access applications. The provision of code concatenation, helical interleaving, and simulation results of new punctured convolutional codes are included. A number of coded

William W. Wu; David Haccoun; Robert Peile; Yasuo Hirata

1987-01-01

66

Communication satellite processing repeaters  

Microsoft Academic Search

Two kinds of processing repeaters which may find application on communication satellites in the near future are described. The type I repeater allows access only if the transmitted signal contains a predetermined code structure. This serves three purposes: first, unauthorized users are excluded, second, co-channel interfering signals are not retransmitted on the downlink, so as not to waste a portion

R. Y. Huang; P. Hooten

1971-01-01

67

Future communications satellite applications  

NASA Technical Reports Server (NTRS)

The point of view of the research is made through the use of viewgraphs. It is suggested that future communications satellite applications will be made through switched point to point narrowband communications. Some characteristics of which are as follows: small/low cost terminals; single hop communications; voice compatible; full mesh networking; ISDN compatible; and possible limited use of full motion video. Some target applications are as follows: voice/data networks between plants and offices in a corporation; data base networking for commercial and science users; and cellular radio internodal voice/data networking.

Bagwell, James W.

1992-01-01

68

Land-mobile satellite communication system  

NASA Technical Reports Server (NTRS)

A satellite communications system includes an orbiting communications satellite for relaying communications to and from a plurality of ground stations, and a network management center for making connections via the satellite between the ground stations in response to connection requests received via the satellite from the ground stations, the network management center being configured to provide both open-end service and closed-end service. The network management center of one embodiment is configured to provides both types of service according to a predefined channel access protocol that enables the ground stations to request the type of service desired. The channel access protocol may be configured to adaptively allocate channels to open-end service and closed-end service according to changes in the traffic pattern and include a free-access tree algorithm that coordinates collision resolution among the ground stations.

Yan, Tsun-Yee (Inventor); Rafferty, William (Inventor); Dessouky, Khaled I. (Inventor); Wang, Charles C. (Inventor); Cheng, Unjeng (Inventor)

1993-01-01

69

AERONAUTICAL BROADBAND COMMUNICATIONS VIA SATELLITE  

Microsoft Academic Search

The paper discusses various aspects of aeronautical broadband satellite communications (AirCom). A range of applications and services is identified and categorized into the scenarios of in-flight entertainment, in-flight office, telemedicine, flight security, and flight logistics & maintenance. A number of operational and planned AirCom systems are presented. A structured overview of key issues and respective steps for the system design

M. Werner; M. Holzbock

70

47 CFR 25.215 - Technical requirements for space stations in the Direct Broadcast Satellite Service.  

Code of Federal Regulations, 2010 CFR

...stations in the Direct Broadcast Satellite Service. 25.215 Section 25.215 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2010-10-01

71

47 CFR 25.148 - Licensing provisions for the Direct Broadcast Satellite Service.  

Code of Federal Regulations, 2010 CFR

...provisions for the Direct Broadcast Satellite Service. 25.148 Section 25.148 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2010-10-01

72

47 CFR 25.210 - Technical requirements for space stations in the Fixed-Satellite Service.  

Code of Federal Regulations, 2012 CFR

...for space stations in the Fixed-Satellite Service. 25.210 Section 25.210 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2012-10-01

73

47 CFR 25.148 - Licensing provisions for the Direct Broadcast Satellite Service.  

Code of Federal Regulations, 2013 CFR

...provisions for the Direct Broadcast Satellite Service. 25.148 Section 25.148 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2013-10-01

74

47 CFR 25.148 - Licensing provisions for the Direct Broadcast Satellite Service.  

Code of Federal Regulations, 2012 CFR

...provisions for the Direct Broadcast Satellite Service. 25.148 Section 25.148 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2012-10-01

75

47 CFR 25.215 - Technical requirements for space stations in the Direct Broadcast Satellite Service.  

Code of Federal Regulations, 2011 CFR

...stations in the Direct Broadcast Satellite Service. 25.215 Section 25.215 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2011-10-01

76

47 CFR 25.210 - Technical requirements for space stations in the Fixed-Satellite Service.  

Code of Federal Regulations, 2011 CFR

...for space stations in the Fixed-Satellite Service. 25.210 Section 25.210 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2011-10-01

77

47 CFR 25.215 - Technical requirements for space stations in the Direct Broadcast Satellite Service.  

Code of Federal Regulations, 2013 CFR

...stations in the Direct Broadcast Satellite Service. 25.215 Section 25.215 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2013-10-01

78

47 CFR 25.215 - Technical requirements for space stations in the Direct Broadcast Satellite Service.  

Code of Federal Regulations, 2012 CFR

...stations in the Direct Broadcast Satellite Service. 25.215 Section 25.215 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2012-10-01

79

47 CFR 25.210 - Technical requirements for space stations in the Fixed-Satellite Service.  

Code of Federal Regulations, 2010 CFR

...for space stations in the Fixed-Satellite Service. 25.210 Section 25.210 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2010-10-01

80

47 CFR 25.148 - Licensing provisions for the Direct Broadcast Satellite Service.  

Code of Federal Regulations, 2011 CFR

...provisions for the Direct Broadcast Satellite Service. 25.148 Section 25.148 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2011-10-01

81

47 CFR 25.148 - Licensing provisions for the Direct Broadcast Satellite Service.  

Code of Federal Regulations, 2014 CFR

...provisions for the Direct Broadcast Satellite Service. 25.148 Section 25.148 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2014-10-01

82

Low Earth orbit communications satellite  

NASA Astrophysics Data System (ADS)

A current thrust in satellite communication systems considers a low-Earth orbiting constellations of satellites for continuous global coverage. Conceptual design studies have been done at the time of this design project by LORAL Aerospace Corporation under the program name GLOBALSTAR and by Motorola under their IRIDIUM program. This design project concentrates on the spacecraft design of the GLOBALSTAR low-Earth orbiting communication system. Overview information on the program was gained through the Federal Communications Commission licensing request. The GLOBALSTAR system consists of 48 operational satellites positioned in a Walker Delta pattern providing global coverage and redundancy. The operational orbit is 1389 km (750 nmi) altitude with eight planes of six satellites each. The orbital planes are spaced 45 deg., and the spacecraft are separated by 60 deg. within the plane. A Delta 2 launch vehicle is used to carry six spacecraft for orbit establishment. Once in orbit, the spacecraft will utilize code-division multiple access (spread spectrum modulation) for digital relay, voice, and radio determination satellite services (RDSS) yielding position determination with accuracy up to 200 meters.

Moroney, D.; Lashbrook, D.; McKibben, B.; Gardener, N.; Rivers, T.; Nottingham, G.; Golden, B.; Barfield, B.; Bruening, J.; Wood, D.

83

Low Earth orbit communications satellite  

NASA Technical Reports Server (NTRS)

A current thrust in satellite communication systems considers a low-Earth orbiting constellations of satellites for continuous global coverage. Conceptual design studies have been done at the time of this design project by LORAL Aerospace Corporation under the program name GLOBALSTAR and by Motorola under their IRIDIUM program. This design project concentrates on the spacecraft design of the GLOBALSTAR low-Earth orbiting communication system. Overview information on the program was gained through the Federal Communications Commission licensing request. The GLOBALSTAR system consists of 48 operational satellites positioned in a Walker Delta pattern providing global coverage and redundancy. The operational orbit is 1389 km (750 nmi) altitude with eight planes of six satellites each. The orbital planes are spaced 45 deg., and the spacecraft are separated by 60 deg. within the plane. A Delta 2 launch vehicle is used to carry six spacecraft for orbit establishment. Once in orbit, the spacecraft will utilize code-division multiple access (spread spectrum modulation) for digital relay, voice, and radio determination satellite services (RDSS) yielding position determination with accuracy up to 200 meters.

Moroney, D.; Lashbrook, D.; Mckibben, B.; Gardener, N.; Rivers, T.; Nottingham, G.; Golden, B.; Barfield, B.; Bruening, J.; Wood, D.

1992-01-01

84

Business Use of Satellite Communications.  

ERIC Educational Resources Information Center

Reviews business communications development and discusses business applications of satellite communications, system technology, and prospects for future developments in digital transmission systems. (JN)

Edelson, Burton I.; Cooper, Robert S.

1982-01-01

85

Laser satellite communication network-vibration effect and possible solutions  

Microsoft Academic Search

A number of serious consortiums develop satellite communication networks. The objective of these communication projects is to service personal communication users almost everywhere on Earth. The intersatellite links in those projects use microwave radiation as the carrier. Free-space optical communication between satellites networked together can make possible high-speed communication between different places on Earth. Some advantages of an optical communication

SHLOMI ARNON; N. S. Kopeika

1997-01-01

86

Digital, Satellite-Based Aeronautical Communication  

NASA Technical Reports Server (NTRS)

Satellite system relays communication between aircraft and stations on ground. System offers better coverage with direct communication between air and ground, costs less and makes possible new communication services. Carries both voice and data. Because many data exchanged between aircraft and ground contain safety-related information, probability of bit errors essential.

Davarian, F.

1989-01-01

87

Advanced Communications Technology Satellite (ACTS)  

Microsoft Academic Search

The authors provide an overview of the NASA Advanced Communications Technology Satellite (ACTS) and discuss the value of the technology for future communication systems. The high-risk technologies selected for ACTS were those having the potential to dramatically enhance the capabilities of the satellite communications industry. This experimental satellite, which is scheduled to be launched in 1992, will furnish very small

R. T. Gedney; R. J. Schertler

1989-01-01

88

47 CFR 25.149 - Application requirements for ancillary terrestrial components in the mobile-satellite service...  

Code of Federal Regulations, 2012 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...1093 of this chapter for Satellite Communications Services devices....

2012-10-01

89

47 CFR 25.149 - Application requirements for ancillary terrestrial components in the Mobile-Satellite Service...  

Code of Federal Regulations, 2013 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...1093 of this chapter for Satellite Communications Services devices....

2013-10-01

90

47 CFR 25.149 - Application requirements for ancillary terrestrial components in the mobile-satellite service...  

Code of Federal Regulations, 2011 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...1093 of this chapter for Satellite Communications Services devices....

2011-10-01

91

47 CFR 25.142 - Licensing provisions for the non-voice, non-geostationary Mobile-Satellite Service.  

Code of Federal Regulations, 2013 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and...Safety and distress communications. Stations operating...non-geostationary mobile-satellite service that...

2013-10-01

92

47 CFR 25.149 - Application requirements for ancillary terrestrial components in the mobile-satellite service...  

Code of Federal Regulations, 2010 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...1093 of this chapter for Satellite Communications Services devices....

2010-10-01

93

47 CFR 25.142 - Licensing provisions for the non-voice, non-geostationary mobile-satellite service.  

Code of Federal Regulations, 2011 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and...Safety and distress communications. Stations operating...non-geostationary mobile-satellite service that...

2011-10-01

94

47 CFR 25.142 - Licensing provisions for the non-voice, non-geostationary mobile-satellite service.  

Code of Federal Regulations, 2012 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and...Safety and distress communications. Stations operating...non-geostationary mobile-satellite service that...

2012-10-01

95

Satellite Services Rate Schedule Effective March 26, 2014  

E-print Network

Satellite Services Rate Schedule Effective March 26, 2014 SCPS offers satellite communications Satellite Services email satellite@virginia.edu or call 434-982-5268. Services UVa/State Regular* UVa Studio to Vyvx $335 $500 $400 $600 IFB & PL $15 $20 $20 $30 Tape Playback $65 $100 $85 $125 Satellite

Acton, Scott

96

AUSSAT mobile satellite services  

NASA Technical Reports Server (NTRS)

An overview of AUSSAT's planned mobile satellite system is given. The development program which is being undertaken to achieve the 1992 service date is described. Both business and technical aspects of the development program are addressed.

Nowland, Wayne L.; Wagg, Michael; Simpson, Daniel

1988-01-01

97

DCS/FTS Commercial Satellite Communications System  

NASA Astrophysics Data System (ADS)

In order to control the rising costs of telephonic services and meeting the increasing demand for wideband video and data services within U.S. Federal Government agencies, the Defense Communications Agency and the General Services Administration have begun the implementation of a leased Commercial Satellite Communications System. Service volume demand, commonality of service requirements, and common geographic communities of interest facilitate economies of scale in the course of meeting DOD and other Federal agencies' objectives. The service, which incorporates the Federal Telecommunications Service and is therefore designated DCS/FTS, is presently studied with respect to military and national objectives.

Shimabukuro, T.; Rosner, R.; Pearsall, C.

98

Interim Service ISDN Satellite (ISIS) network model for advanced satellite designs and experiments  

NASA Technical Reports Server (NTRS)

The Interim Service Integrated Services Digital Network (ISDN) Satellite (ISIS) Network Model for Advanced Satellite Designs and Experiments describes a model suitable for discrete event simulations. A top-down model design uses the Advanced Communications Technology Satellite (ACTS) as its basis. The ISDN modeling abstractions are added to permit the determination and performance for the NASA Satellite Communications Research (SCAR) Program.

Pepin, Gerard R.; Hager, E. Paul

1991-01-01

99

A forecast of broadcast satellite communications  

NASA Technical Reports Server (NTRS)

This paper presents forecasts of likely changes in broadcast satellite technology, the technology of ground terminals, and the technology of terrestrial communications competitive with satellites. The impacts of these changes in technology are then assessed, using a cross-impact model of U.S. domestic telecommunications, to determine the consequences of various possible changes in communications satellite technology. These consequences are discussed in terms of various possible services, for households, businesses, and specialized customers, which might become economically viable as a result of improvements in satellite technology.

Martino, J. P.; Lenz, R. C., Jr.

1977-01-01

100

Trends in mobile satellite communication  

Microsoft Academic Search

Ever since the U.S. Federal Communication Commission opened the discussion on spectrum usage for personal handheld communication, the community of satellite manufacturers has been searching for an economically viable and technically feasible satellite mobile communication system. Hughes Aircraft Company and others have joined in providing proposals for such systems, ranging from low to medium to geosynchronous orbits. These proposals make

Klaus G. Johannsen; Mike W. Bowles; Samuel Milliken; Alan R. Cherrette; Gregory C. Busche

1993-01-01

101

Role of satellite communications in integrated business communications  

NASA Astrophysics Data System (ADS)

The geographic and service integration of business communication networks that include satellite links are explored. Voice, data, bulk data, teleconferencing, and document distribution services are expected to be found at user earth-station sites. Similar capabilities can be expected at regional facilities located off the earth-station site. This geographic and service integration, built on a satellite network backbone, offers a major opportunity to achieve improved business productivity in the 1980's.

Russell, D. C.

102

Survey: National Environmental Satellite Service  

NASA Technical Reports Server (NTRS)

The national Environmental Satellite Service (NESS) receives data at periodic intervals from satellites of the Synchronous Meteorological Satellite/Geostationary Operational Environmental Satellite series and from the Improved TIROS (Television Infrared Observational Satellite) Operational Satellite. Within the conterminous United States, direct readout and processed products are distributed to users over facsimile networks from a central processing and data distribution facility. In addition, the NESS Satellite Field Stations analyze, interpret, and distribute processed geostationary satellite products to regional weather service activities.

1977-01-01

103

NASA's program in communication satellites  

NASA Technical Reports Server (NTRS)

It is noted that NASA is currently proceeding with a revitalized R&D program aimed at the development and demonstration of advanced communication satellite system concepts and the related enabling technologies. The paper reviews the important elements of this program thrust, the approach NASA is taking to assure proper involvement of both the system supplier industry and the service supplier industry and the specific technology focus in the near term. Finally, highlights of the current NASA and industry activities related to opening up the 30/20 GHz frequency band for both commercial and military use are presented.

Sivo, J. N.

1980-01-01

104

Corporate strategies for satellite communications  

NASA Astrophysics Data System (ADS)

Terrestrial and satellite broadcast communications technologies, while clearly providing tremendous benefits in many market sectors, present something of a challenge to the strategic planning bodies in most organizations. This is because there is no existing analog for the services in the organizations' telecommunications networks. The marketplace is therefore a confusing place for such organizations swamped as it is with competing service providers, technologies, and services, and their telecommunications strategies cannot cope with the opportunities because they have been founded on the exploitation of point to point connections. A mechanism for creating and bounding strategies which combines the rigor of structured analysis with a comprehensive categorization of strategic directions which has been successfully used to generate new paneuropean telecommunications strategies is presented.

Birch, David G. W.; Buck, S. Peter

1991-10-01

105

Channel characterisation for spread spectrum satellite communications  

Microsoft Academic Search

The paper examines the characteristics of satellite propagation channels for spread spectrum communications. Based on measurement campaigns at L-band, the signal bandwidth is determined when the channel becomes frequency-selective. A wideband channel model for land mobile satellite (LMS) services is presented which characterises the time-varying transmission channel between a satellite and a mobile user terminal. The parameters of the model

Axel Jahn; Hermann Bischl; G. Heiss

1996-01-01

106

Satellite Applications for Public Service: Project Summaries.  

ERIC Educational Resources Information Center

Summaries of 18 different projects involving the use of satellite communications are presented in this report, including PEACESAT Education and Communication Experiments, USP Network Satellite Communication Project, Project Satellite, Satellite Instructional Television Experiment (SITE), Appalachian Education Satellite Program, Alaska Education…

Lauffer, Sandra; And Others

107

Optical satellite communications in Europe  

NASA Astrophysics Data System (ADS)

This paper describes optical satellite communication activities based on technology developments, which started in Europe more than 30 years ago and led in 2001 to the world-first optical inter-satellite communication link experiment (SILEX). SILEX proved that optical communication technologies can be reliably mastered in space and in 2006 the Japanese Space Agency (JAXA) joined the optical inter-satellite experiment from their own satellite. Since 2008 the German Space Agency (DLR) is operating an inter-satellite link between the NFIRE and TerraSAR-X satellites based on a second generation of laser communication technology, which will be used for the new European Data Relay Satellite (EDRS) system to be deployed in 2013.

Sodnik, Zoran; Lutz, Hanspeter; Furch, Bernhard; Meyer, Rolf

2010-02-01

108

78 FR 14920 - Earth Stations Aboard Aircraft Communicating With Fixed-Satellite Service Geostationary-Orbit...  

Federal Register 2010, 2011, 2012, 2013, 2014

...IB Docket No. 12-376; FCC 12-161] Earth Stations Aboard Aircraft Communicating With...establishes technical and licensing rules for Earth Stations Aboard Aircraft (ESAA), i.e., earth stations on aircraft communicating with...

2013-03-08

109

Japan's CS (Sakura) communications satellite experiments. VI D - Communications Experiments: New applications to satellite communications  

NASA Astrophysics Data System (ADS)

An outline is presented of communications satellite (CS) applied systems experiments and results obtained in areas of public service (the National Police Agency of Japan, and Japan National Railways), computer network services, and advanced teleconference system experiments. Two distinct approaches to computer communications are examined: (1) centralized and distributed controlled computer network experiments, and (2) a high-speed computer communications experiment. The interoffice packet signal transmission experiment is discussed as well as news transmission experiments, an enhanced video-conferencing experiment and a precise time-comparison and dissemination experiment.

Takahashi, H.; Saruwatari, T.; Imae, M.; Suzuki, M.; Nakashima, H.

1986-05-01

110

Domestic satellite communications systems - Background and projections  

NASA Astrophysics Data System (ADS)

Planned and existing national and international communications satellites are reviewed, along with comparative costs for leasing or owning a satellite and the basic capabilities of communications spacecraft. Eleven different satellite communications systems existed in 1982, including Intelsat, Marisat/Inmarsat, and Intersputnik as the international segments, and the Molniya, Telesat, Palapa, Westar, Satcom, Comstar, Amersat, and the SBS national systems. Seven of the twenty countries leasing Intelsat services are planning their own satellites. Leasing permits full capabilities withno development costs and ensures the lessor of full use of the satellite capacities. Developing countries can then gain hands-on experience with space technologies. Future demands are discussed, noting the broadening of the available bandwidths, better orbit utilization, and increases in transponder numbers to handle increased loads in future spacecraft.

Bargellini, P. L.

111

Advanced satellite communication system  

NASA Technical Reports Server (NTRS)

The objective of this research program was to develop an innovative advanced satellite receiver/demodulator utilizing surface acoustic wave (SAW) chirp transform processor and coherent BPSK demodulation. The algorithm of this SAW chirp Fourier transformer is of the Convolve - Multiply - Convolve (CMC) type, utilizing off-the-shelf reflective array compressor (RAC) chirp filters. This satellite receiver, if fully developed, was intended to be used as an on-board multichannel communications repeater. The Advanced Communications Receiver consists of four units: (1) CMC processor, (2) single sideband modulator, (3) demodulator, and (4) chirp waveform generator and individual channel processors. The input signal is composed of multiple user transmission frequencies operating independently from remotely located ground terminals. This signal is Fourier transformed by the CMC Processor into a unique time slot for each user frequency. The CMC processor is driven by a waveform generator through a single sideband (SSB) modulator. The output of the coherent demodulator is composed of positive and negative pulses, which are the envelopes of the chirp transform processor output. These pulses correspond to the data symbols. Following the demodulator, a logic circuit reconstructs the pulses into data, which are subsequently differentially decoded to form the transmitted data. The coherent demodulation and detection of BPSK signals derived from a CMC chirp transform processor were experimentally demonstrated and bit error rate (BER) testing was performed. To assess the feasibility of such advanced receiver, the results were compared with the theoretical analysis and plotted for an average BER as a function of signal-to-noise ratio. Another goal of this SBIR program was the development of a commercial product. The commercial product developed was an arbitrary waveform generator. The successful sales have begun with the delivery of the first arbitrary waveform generator.

Staples, Edward J.; Lie, Sen

1992-01-01

112

47 CFR 25.143 - Licensing provisions for the 1.6/2.4 GHz mobile-satellite service and 2 GHz mobile-satellite...  

Code of Federal Regulations, 2011 CFR

...mobile-satellite service and 2 GHz mobile-satellite service. 25.143 Section 25.143 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2011-10-01

113

47 CFR 25.143 - Licensing provisions for the 1.6/2.4 GHz Mobile-Satellite Service and 2 GHz Mobile-Satellite...  

Code of Federal Regulations, 2013 CFR

...Mobile-Satellite Service and 2 GHz Mobile-Satellite Service. 25.143 Section 25.143 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2013-10-01

114

47 CFR 25.143 - Licensing provisions for the 1.6/2.4 GHz mobile-satellite service and 2 GHz mobile-satellite...  

Code of Federal Regulations, 2010 CFR

...mobile-satellite service and 2 GHz mobile-satellite service. 25.143 Section 25.143 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2010-10-01

115

47 CFR 25.143 - Licensing provisions for the 1.6/2.4 GHz mobile-satellite service and 2 GHz mobile-satellite...  

Code of Federal Regulations, 2012 CFR

...mobile-satellite service and 2 GHz mobile-satellite service. 25.143 Section 25.143 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2012-10-01

116

47 CFR 25.144 - Licensing provisions for the 2.3 GHz satellite digital audio radio service.  

Code of Federal Regulations, 2013 CFR

...Licensing provisions for the 2.3 GHz satellite digital audio radio service...144 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2013-10-01

117

47 CFR 25.144 - Licensing provisions for the 2.3 GHz satellite digital audio radio service.  

Code of Federal Regulations, 2010 CFR

...Licensing provisions for the 2.3 GHz satellite digital audio radio service...144 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2010-10-01

118

47 CFR 25.144 - Licensing provisions for the 2.3 GHz satellite digital audio radio service.  

Code of Federal Regulations, 2011 CFR

...Licensing provisions for the 2.3 GHz satellite digital audio radio service...144 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2011-10-01

119

47 CFR 25.214 - Technical requirements for space stations in the Satellite Digital Audio Radio Service and...  

Code of Federal Regulations, 2013 CFR

...214 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards § 25...requirements for space stations in the Satellite Digital Audio Radio Service...

2013-10-01

120

47 CFR 25.144 - Licensing provisions for the 2.3 GHz satellite digital audio radio service.  

Code of Federal Regulations, 2012 CFR

...Licensing provisions for the 2.3 GHz satellite digital audio radio service...144 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses...

2012-10-01

121

47 CFR 25.214 - Technical requirements for space stations in the satellite digital audio radio service and...  

Code of Federal Regulations, 2010 CFR

...214 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards § 25...requirements for space stations in the satellite digital audio radio service...

2010-10-01

122

47 CFR 25.214 - Technical requirements for space stations in the satellite digital audio radio service and...  

Code of Federal Regulations, 2011 CFR

...214 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards § 25...requirements for space stations in the satellite digital audio radio service...

2011-10-01

123

47 CFR 25.214 - Technical requirements for space stations in the satellite digital audio radio service and...  

Code of Federal Regulations, 2012 CFR

...214 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards § 25...requirements for space stations in the satellite digital audio radio service...

2012-10-01

124

47 CFR 25.214 - Technical requirements for space stations in the Satellite Digital Audio Radio Service and...  

Code of Federal Regulations, 2014 CFR

...214 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards § 25...requirements for space stations in the Satellite Digital Audio Radio Service...

2014-10-01

125

Operating Frequencies for Educational Satellite Services.  

ERIC Educational Resources Information Center

Part of a continuing study of application of communication satellites for helping to meet educational needs, this memorandum discusses operating frequencies for educational satellite services. Each of the factors affecting choice of transmission frequencies is identified and discussed in a separate section. Included among these factors are…

Singh, Jai P.

126

Satellites extend communications to remote areas  

SciTech Connect

The advent of new communications technologies has played a lead role in building the global village, enabling companies to conduct international business more cost-efficiently, especially when an increasing number of companies are exploring remote parts of the world with minimal or non-existent infrastructure. Both voice and data communications have become significant challenges in these undeveloped areas. To solve this problem, oil and gas companies have begun relying on satellite communications. Recent advances in technology and new satellite systems being developed will enable companies to select from a broader range of services and price options.

Amey, S. [Discovery Communications, Crofton, MD (United States)

1996-10-01

127

Trends in mobile satellite communication  

NASA Astrophysics Data System (ADS)

Ever since the U.S. Federal Communication Commission opened the discussion on spectrum usage for personal handheld communication, the community of satellite manufacturers has been searching for an economically viable and technically feasible satellite mobile communication system. Hughes Aircraft Company and others have joined in providing proposals for such systems, ranging from low to medium to geosynchronous orbits. These proposals make it clear that the trend in mobile satellite communication is toward more sophisticated satellites with a large number of spot beams and onboard processing, providing worldwide interconnectivity. Recent Hughes studies indicate that from a cost standpoint the geosynchronous satellite (GEOS) is most economical, followed by the medium earth orbit satellite (MEOS) and then by the low earth orbit satellite (LEOS). From a system performance standpoint, this evaluation may be in reverse order, depending on how the public will react to speech delay and collision. This paper discusses the trends and various mobile satellite constellations in satellite communication under investigation. It considers the effect of orbital altitude and modulation/multiple access on the link and spacecraft design.

Johannsen, Klaus G.; Bowles, Mike W.; Milliken, Samuel; Cherrette, Alan R.; Busche, Gregory C.

128

Trends in mobile satellite communication  

NASA Technical Reports Server (NTRS)

Ever since the U.S. Federal Communication Commission opened the discussion on spectrum usage for personal handheld communication, the community of satellite manufacturers has been searching for an economically viable and technically feasible satellite mobile communication system. Hughes Aircraft Company and others have joined in providing proposals for such systems, ranging from low to medium to geosynchronous orbits. These proposals make it clear that the trend in mobile satellite communication is toward more sophisticated satellites with a large number of spot beams and onboard processing, providing worldwide interconnectivity. Recent Hughes studies indicate that from a cost standpoint the geosynchronous satellite (GEOS) is most economical, followed by the medium earth orbit satellite (MEOS) and then by the low earth orbit satellite (LEOS). From a system performance standpoint, this evaluation may be in reverse order, depending on how the public will react to speech delay and collision. This paper discusses the trends and various mobile satellite constellations in satellite communication under investigation. It considers the effect of orbital altitude and modulation/multiple access on the link and spacecraft design.

Johannsen, Klaus G.; Bowles, Mike W.; Milliken, Samuel; Cherrette, Alan R.; Busche, Gregory C.

1993-01-01

129

78 FR 14952 - Earth Stations Aboard Aircraft Communicating with Fixed-Satellite Service Geostationary-Orbit...  

Federal Register 2010, 2011, 2012, 2013, 2014

...IB Docket No. 12-376; FCC 12-161] Earth Stations Aboard Aircraft Communicating...proposal to elevate the allocation status of Earth Stations Aboard Aircraft (ESAA) in the...11.7-12.2 GHz band (space-to-Earth), on an unprotected basis in...

2013-03-08

130

Technology requirements for post-1985 communications satellites  

NASA Technical Reports Server (NTRS)

The technical and functional requirements for commercial communication satellites are discussed. The need for providing quality service at an acceptable cost is emphasized. Specialized services are postulated in a needs model which forecasts future demands. This needs model is based upon 322 separately identified needs for long distance communication. It is shown that the 1985 demand for satellite communication service for a domestic region such as the United States, and surrounding sea and air lanes, may require on the order of 100,000 MHz of bandwith. This level of demand can be met by means of the presently allocated bandwidths and developing some key technologies. Suggested improvements include: (1) improving antennas so that high speed switching will be possible; (2) development of solid state transponders for 12 GHz and possibly higher frequencies; (3) development of switched or steered beam antennas with 10 db or higher gain for aircraft; and (4) continued development of improved video channel compression techniques and hardware.

Burtt, J. E.; Moe, C. R.; Elms, R. V.; Delateur, L. A.; Sedlacek, W. C.; Younger, G. G.

1973-01-01

131

Traffic assignment in communication satellites  

Microsoft Academic Search

A high capacity communication satellite interconnects scores of ground stations simultaneously. Under the Satellite-Switched\\/Time Division Multiple Access (SS\\/TDMA) system, each channel of the satellite is allocated to a pair of ground stations for a certain time period, after which the whole set of allocations (called a switch) is changed simultaneously. The problem the authors is to minimize the time length

E. Balas; P. R. Landweer

1983-01-01

132

Interim Service ISDN Satellite (ISIS) simulator development for advanced satellite designs and experiments  

NASA Technical Reports Server (NTRS)

The simulation development associated with the network models of both the Interim Service Integrated Services Digital Network (ISDN) Satellite (ISIS) and the Full Service ISDN Satellite (FSIS) architectures is documented. The ISIS Network Model design represents satellite systems like the Advanced Communications Technology Satellite (ACTS) orbiting switch. The FSIS architecture, the ultimate aim of this element of the Satellite Communications Applications Research (SCAR) Program, moves all control and switching functions on-board the next generation ISDN communications satellite. The technical and operational parameters for the advanced ISDN communications satellite design will be obtained from the simulation of ISIS and FSIS engineering software models for their major subsystems. Discrete event simulation experiments will be performed with these models using various traffic scenarios, design parameters, and operational procedures. The data from these simulations will be used to determine the engineering parameters for the advanced ISDN communications satellite.

Pepin, Gerard R.

1992-01-01

133

NASA compendium of satellite communications programs  

NASA Technical Reports Server (NTRS)

A comprehensive review of worldwide satellite communication programs is reported that ranges in time from the inception of satellite communications to mid-1971. Particular emphasis is placed on program results, including experiments conducted, communications system operational performance, and technology employed.

1971-01-01

134

Gigabit Satellite Network for NASA's Advanced Communication Technology Satellite (ACTS)  

NASA Technical Reports Server (NTRS)

The advanced communication technology satellite (ACTS) gigabit satellite network provides long-haul point-to-point and point-to-multipoint full-duplex SONET services over NASA's ACTS. at rates up to 622 Mbit/s (SONET OC-12), with signal quality comparable to that obtained with terrestrial fiber networks. Data multiplexing over the satellite is accomplished using time-division multiple access (TDMA) techniques coordinated with the switching and beam hopping facilities provided by ACTS. Transmissions through the satellite are protected with Reed-Solomon encoding. providing virtually error-free transmission under most weather conditions. Unique to the system are a TDMA frame structure and satellite synchronization mechanism that allow: (a) very efficient utilization of the satellite capacity: (b) over-the-satellite dosed-loop synchronization of the network in configurations with up to 64 ground stations: and (c) ground station initial acquisition without collisions with existing signalling or data traffic. The user interfaces are compatible with SONET standards, performing the function of conventional SONET multiplexers and. as such. can be: readily integrated with standard SONET fiber-based terrestrial networks. Management of the network is based upon the simple network management protocol (SNMP). and includes an over-the-satellite signalling network and backup terrestrial internet (IP-based) connectivity. A description of the ground stations is also included.

Hoder, Douglas; Bergamo, Marcos

1996-01-01

135

76 FR 49364 - Fixed and Mobile Services in the Mobile Satellite Service Bands at 1525-1559 MHz and 1626.5-1660...  

Federal Register 2010, 2011, 2012, 2013, 2014

...FEDERAL COMMUNICATIONS COMMISSION 47 CFR Parts...Services in the Mobile Satellite Service Bands at 1525-1559...Reconsideration AGENCY: Federal Communication Commission. ACTION...Services in the Mobile Satellite Service Bands at...

2011-08-10

136

Communications Satellites Using Arrays  

Microsoft Academic Search

Passive reflectors require large ground antennas and powers but permit use of unstabilized reflectors. Active systems, on the other hand, offer attractive performance through high directivity antennas but generally require stabilized vehicles. Further, the reliability of a satellite repeater amplifier is a critical factor. Automatic angle return arrays are investigated for both passive and active systems. These arrays, called Van

R. C. Hansen

1961-01-01

137

Communications satellite systems operations with the space station, volume 2  

NASA Technical Reports Server (NTRS)

A financial model was developed which described quantitatively the economics of the space segment of communication satellite systems. The model describes the economics of the space system throughout the lifetime of the satellite. The expected state-of-the-art status of communications satellite systems and operations beginning service in 1995 were assessed and described. New or enhanced space-based activities and associated satellite system designs that have the potential to achieve future communications satellite operations in geostationary orbit with improved economic performance were postulated and defined. Three scenarios using combinations of space-based activities were analyzed: a spin stabilized satellite, a three axis satellite, and assembly at the Space Station and GEO servicing. Functional and technical requirements placed on the Space Station by the scenarios were detailed. Requirements on the satellite were also listed.

Price, K.; Dixon, J.; Weyandt, C.

1987-01-01

138

Full Service ISDN Satellite (FSIS) network model for advanced ISDN satellite design and experiments  

NASA Technical Reports Server (NTRS)

The Full Service Integrated Services Digital Network (FSIS) network model for advanced satellite designs describes a model suitable for discrete event simulations. A top down model design uses the Advanced Communications Technology Satellite (ACTS) as its basis. The ACTS and the Interim Service ISDN Satellite (ISIS) perform ISDN protocol analyses and switching decisions in the terrestrial domain, whereas FSIS makes all its analyses and decisions on-board the ISDN satellite.

Pepin, Gerard R.

1992-01-01

139

Mobile satellite service for Canada  

NASA Technical Reports Server (NTRS)

The Mobile Satellite (MSAT) system and a special program designed to provide interim mobile satellite services (IMSS) during the construction phase of MSAT are described. A mobile satellite system is a key element in extending voice and and data telecommunications to all Canadians.

Sward, David

1988-01-01

140

NOAA Satellite and Information Service  

NSDL National Science Digital Library

"The Satellite Services Division of the National Environmental Satellite, Data, and Information Service (NESDIS) provides real time access to satellite data and products for the public and government." Users can locate Hazard Mapping System (HMS) Fire Analysis, real-time satellite fire monitoring, Web-based GIS fire analysis, and additional fire products. The OSEI (Operational Significant Event Imagery) link supplies archived and current images of flood events, severe weather, tropical cyclones, and other significant environmental events. Researchers can find technical information on the satellites. Individuals can also find bulletins, advisories, text data, and images of precipitation, snow and ice, volcanic activity, winds, and tropical weather.

141

Federal research and development for satellite communications  

NASA Technical Reports Server (NTRS)

A Committee on Satellite Communication (COSC) was formed under the auspices of the Space Applications Board (SAB) in order to study Federal research and development on satellite communications (SC). Discussion on whether to continue the research and development and the proper role of the Federal Government are addressed. Discussion focussed on six possible options for a Federal role in SC research and development: (1) the current NASA SC program; (2) an expanded NASA SC technology program; (3) a SC technology flight test support program; (4) an experimental SC technology flight program; (5) an experimental public service SC system program; and (6) an operational public service SC system program. Decision criteria and recommendations are presented.

1977-01-01

142

Telemammography Using Satellite Communications  

NASA Technical Reports Server (NTRS)

Telemammography, the electronic transmission of digitized mammograms, can connect patients with timely, critical medical expertise; howev er, an adequate terrestrial communications infrastructure does not exist in these areas. NASA Lewis Research Center's Advanced Space Commu nications Laboratory is now working with leading breast cancer resear ch hospitals, including the Cleveland Clinic and the University of Virginia, to perform the critical research necessary to allow new satell ite networks to support telemammography.

1996-01-01

143

Future developments in aeronautical satellite communications  

NASA Technical Reports Server (NTRS)

Very shortly aeronautical satellite communications will be introduced on a world wide basis. By the end of the year, voice communications (both to the cabin and cockpit) and packet data communications will be available to both airlines and executive aircraft. During the decade following the introduction of the system, there will be many enhancements and developments which will increase the range of applications, expand the potential number of users, and reduce costs. A number of ways in which the system is expected to evolve over this period are presented. Among the issues which are covered are the impact of spot beam satellites, spectrum and power conservation techniques, and the expanding range of user services.

Wood, Peter

1990-01-01

144

Lens Antenna For Mobile/Satellite Communication  

NASA Technical Reports Server (NTRS)

Flat, compact antenna made of stripline elements aimed at fixed elevation angle but steered electronically in azimuth. Design simplified by maintaining fixed elevation and relying on width of beam to cover desired elevation range. Need for phase shifter at each radiating element eliminated by arranging elements in circles and feeding through stripline disks called "R-KR lenses". Used in Mobile/Satellite Service, antenna mounted on top of vehicle on Earth and used to keep transmitted and received antenna beams aimed approximately toward communication satellite.

Bodnar, D. G.; Rainer, B. K.

1988-01-01

145

Communications and media services  

NASA Technical Reports Server (NTRS)

NASA's internal and external communication methods are reviewed. NASA information services for the media, for the public, and for employees are discussed. Consideration is given to electron information distribution, the NASA TV-audio system, the NASA broadcast news service, astronaut appearances, technology and information exhibits, speaker services, and NASA news reports for internal communications. Also, the NASA worldwide electronic mail network is described and trends for future NASA communications and media services are outlined.

Mcculla, James W.; Kukowski, James F.

1990-01-01

146

76 FR 67070 - Operation of Wireless Communications Services in the 2.3 GHz Band; Establishment of Rules and...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Operation of Wireless Communications Services in the 2...Digital Audio Radio Satellite Service in the 2310-2360...Band AGENCY: Federal Communications Commission. ACTION...Operation of Wireless Communications Services in the 2...Digital Audio Radio Satellite Service in the...

2011-10-31

147

Spacecraft in switch matrix for wide band service applicatons in 30/20 GHz communications satellite systems  

NASA Technical Reports Server (NTRS)

Bandwidth, switching speed, off-state isolation, and reliability over a ten-year mission were factors in determining the optimum available technology for satellite communications switching in 1982. A proof of concept model for a 20 x 20 coupled crossbar switch matrix designed with FET devices for microwave switching and with high speed CMOS LIS for switch crosspoint addressing was fabricated and tested. Results show the design is feasible for application in a multichannel SS-TDMA communications system. Expandibility can readily be achieved with this design. A conceptual design study for a 100 x 100 switch matrix utilizing a coupled crossbar architecture implemented with a monolithic microwave integrated circuits revealed technology needs for high capacity switch matrices.

Cory, B. J.

1982-01-01

148

Advanced mobile satellite communications using COMETS satellite in MM-wave and Ka-band  

NASA Technical Reports Server (NTRS)

Early in the 21st century, the demand for personal communications using mobile, hand-held, and VSAT terminals will rapidly increase. In a future system, many different types of services should be provided with one-hop connection. The Communications Research Laboratory (CRL) has studied a future advanced mobile satellite communications system using millimeter wave and Ka band. In 1990, CRL started the Communications and Broadcasting Engineering Test Satellite (COMETS) project. The satellite has been developed in conjunction with NASDA and will be launched in 1997. This paper describes the COMETS payload configuration and the experimental system for the advanced mobile communications mission.

Ohmori, Shingo; Isobe, Shunkichi; Takeuchi, Makoto; Naito, Hideyuki

1993-01-01

149

Low earth orbit satellite based communication systems — Research opportunities  

Microsoft Academic Search

Telecommunication systems are undergoing revolutionary changes that are transforming society, changing the way in which industrial and service organizations operate, and are having a profound effect on the daily life of individuals. Low earth orbit satellite (LEOS) based communication systems are a new and exciting endeavor in reshaping the global communication network and the services that it provides. Huge investments

Bezalel Gavish

1997-01-01

150

Research Supporting Satellite Communications Technology  

NASA Technical Reports Server (NTRS)

This report describes the second year of research effort under the grant Research Supporting Satellite Communications Technology. The research program consists of two major projects: Fault Tolerant Link Establishment and the design of an Auto-Configurable Receiver. The Fault Tolerant Link Establishment protocol is being developed to assist the designers of satellite clusters to manage the inter-satellite communications. During this second year, the basic protocol design was validated with an extensive testing program. After this testing was completed, a channel error model was added to the protocol to permit the effects of channel errors to be measured. This error generation was used to test the effects of channel errors on Heartbeat and Token message passing. The C-language source code for the protocol modules was delivered to Goddard Space Flight Center for integration with the GSFC testbed. The need for a receiver autoconfiguration capability arises when a satellite-to-ground transmission is interrupted due to an unexpected event, the satellite transponder may reset to an unknown state and begin transmitting in a new mode. During Year 2, we completed testing of these algorithms when noise-induced bit errors were introduced. We also developed and tested an algorithm for estimating the data rate, assuming an NRZ-formatted signal corrupted with additive white Gaussian noise, and we took initial steps in integrating both algorithms into the SDR test bed at GSFC.

Horan Stephen; Lyman, Raphael

2005-01-01

151

NASA Launches Next-Generation Communications Satellite  

E-print Network

NASA Launches Next-Generation Communications Satellite Pg 3 Triumph Over Tragedy: Columbia's Last in Florida. "TDRS-K bolsters our network of satellites that provides essential communications to support Goddard View The Weekly ­ 2 NASA Launches Next-Generation Communications Satellite ­ 3 Dinosaur Footprints

Christian, Eric

152

The Aerospace Corporation 2009 Communication Satellite Systems  

E-print Network

© The Aerospace Corporation 2009 Communication Satellite Systems Trends and Network Aspects Paul://www.aero.org/ Lee Center, Caltech 13 April 2009 #12;22 Communication Satellites · Brief History by Decade · Trends: ­ Communication Satellites, fifth edition, by D. Martin, P. Anderson, L. Bartamian, Aerospace / AIAA Press, 2006

Low, Steven H.

153

Launch vehicles for communications satellites  

NASA Technical Reports Server (NTRS)

After giving brief development histories of the Delta and the Atlas Centaur launch vehicles, attention is given to the operational characteristics of the ascent, parking orbit, transfer orbit, and orbital insertion phases of the delivery of a communications satellite to a geostationary orbit by means of a Delta launch vehicle. NASA plans to employ Delta vehicles for as long as they are needed during the transition period to the Space Shuttle. NASA planning for Atlas Centaur includes launches through 1985 for INTELSAT-VA, and through 1986 for FLTSATCOM satellites.

Mahon, J. B.

1982-01-01

154

Trends in NASA communication satellites  

NASA Technical Reports Server (NTRS)

Satellite telecommunications can help to satisfy several national needs such as education, health care, cultural opportunities, and data transfer. There are current experiments being conducted with NASA spacecraft ATS 1, 3, and 5 in an attempt to satisfy these national needs. Future experiments are planned for the ATS F/G and CTS spacecrafts. The next generation of communications satellites must provide multiple region coverage, multichannel capability, high quality TV pictures, and must allow low cost ground receivers to be used. The proposed NASA spacecrafts, ATS H/I, will satisfy these requirements. Other countries of the world can benefit from ATS H/I technology.

Sivo, J. N.; Robbins, W. H.; Stretchberry, D. M.

1972-01-01

155

Satellite communications systems and technology. Executive Summary  

NASA Technical Reports Server (NTRS)

NASA and the National Science Foundation (NSF) commissioned a panel of US experts to study the international status of satellite communications systems and technology. The study covers emerging systems concepts, applications, services, and the attendant technologies. The panel members travelled to Europe, Japan, and Russia to gather information first-hand. They visited 17 sites in Europe, 20 sites in Japan, and four in Russia. These included major manufacturers, government organizations, service providers, and associated R&D facilities. The panel's report was reviewed by the sites visited, by the panel, and by representatives of US industry. The report details the information collected and compares it to US activities.

Edelson, Burton I.; Pelton, Joseph N.; Bostian, Charles W.; Brandon, William T.; Chan, Vincent W. S.; Hager, E. Paul; Helm, Neil R.; Jennings, Raymond D.; Kwan, Robert; Mahle, Christoph E.

1993-01-01

156

Trends in NASA communication satellites.  

NASA Technical Reports Server (NTRS)

Discussion of the potential applications of satellite communications technology in meeting the national needs in education, health care, culture, and data transfer techniques. Experiments with the NASA ATS 1, 3 and 5 spacecraft, which are conducted in an attempt to satisfy such needs, are reviewed. The future needs are also considered, covering the requirements of multiple region coverage, communications between regions, large numbers of ground terminals, multichannel capability and high quality TV pictures. The ATS F and CTS spacecraft are expected to be available in the near future to expand experiments in this field.

Sivo, J. N.; Robbins, W. H.; Stretchberry, D. M.

1972-01-01

157

Application of the Iridium Satellite System to Aeronautical Communications  

NASA Technical Reports Server (NTRS)

The next generation air transportation system will require greater air-ground communications capacity to accommodate more air traffic with increased safety and efficiency. Communications will remain primarily terrestrially based, but satellite communications will have an increased role. Inmarsat s aeronautical services have been approved and are in use for aeronautical safety communications provided by geostationary satellites. More recently the approval process for the Iridium low earth orbit constellation is nearing completion. The current Iridium system will be able to provide basic air traffic services communications suitable for oceanic, remote and polar regions. The planned second generation of the Iridium system, called Iridium NEXT, will provide enhanced capabilities and enable a greater role in the future of aeronautical communications. This paper will review the potential role of satellite communications in the future of air transportation, the Iridium approval process and relevant system testing, and the potential role of Iridium NEXT.

Kerczewski, Robert J.; Meza, Mike; Gupta, Om

2008-01-01

158

78 FR 44029 - Establishment of Rules and Policies for the Digital Audio Radio Satellite Service in the 2310...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Digital Audio Radio Satellite Service in the...AGENCY: Federal Communications Commission. ACTION...Operation of Wireless Communications Services in the...Digital Audio Radio Satellite Service in the...Operation of Wireless Communications Services in the...Digital Audio Radio Satellite Service in...

2013-07-23

159

Printed antenna for satellite communications  

Microsoft Academic Search

An antenna which has been conceived as a portable system for satellite communications based on the recommendations ITU-R S.580–6 [1] and ITU-R S.465–5 [2] for small antennas, i.e., with a diameter lower than 50 wavelengths, is introduced. It is a planar and a compact structure with a size of 40×40×2 cm. The antenna is formed by an array of 256

Andres Garcia-Aguilar; Jose Manuel Inclan-Alonso; Jose Manuel Fernandez-Gonzalez; Manuel Sierra-Perez

2010-01-01

160

Satellite-Based Quantum Communications  

SciTech Connect

Single-photon quantum communications (QC) offers the attractive feature of 'future proof', forward security rooted in the laws of quantum physics. Ground based quantum key distribution (QKD) experiments in optical fiber have attained transmission ranges in excess of 200km, but for larger distances we proposed a methodology for satellite-based QC. Over the past decade we have devised solutions to the technical challenges to satellite-to-ground QC, and we now have a clear concept for how space-based QC could be performed and potentially utilized within a trusted QKD network architecture. Functioning as a trusted QKD node, a QC satellite ('QC-sat') could deliver secret keys to the key stores of ground-based trusted QKD network nodes, to each of which multiple users are connected by optical fiber or free-space QC. A QC-sat could thereby extend quantum-secured connectivity to geographically disjoint domains, separated by continental or inter-continental distances. In this paper we describe our system concept that makes QC feasible with low-earth orbit (LEO) QC-sats (200-km-2,000-km altitude orbits), and the results of link modeling of expected performance. Using the architecture that we have developed, LEO satellite-to-ground QKD will be feasible with secret bit yields of several hundred 256-bit AES keys per contact. With multiple ground sites separated by {approx} 100km, mitigation of cloudiness over any single ground site would be possible, potentially allowing multiple contact opportunities each day. The essential next step is an experimental QC-sat. A number of LEO-platforms would be suitable, ranging from a dedicated, three-axis stabilized small satellite, to a secondary experiment on an imaging satellite. to the ISS. With one or more QC-sats, low-latency quantum-secured communications could then be provided to ground-based users on a global scale. Air-to-ground QC would also be possible.

Hughes, Richard J [Los Alamos National Laboratory; Nordholt, Jane E [Los Alamos National Laboratory; McCabe, Kevin P [Los Alamos National Laboratory; Newell, Raymond T [Los Alamos National Laboratory; Peterson, Charles G [Los Alamos National Laboratory

2010-09-20

161

A native IP satellite communications system  

NASA Astrophysics Data System (ADS)

? In the framework of ESA's ARTES-5 program the Institute of Applied Systems Technology (Joanneum Research) in cooperation with the Department of Communications and Wave Propagation has developed a novel meshed satellite communications system which is optimised for Internet traffic and applications (L*IP—Local Network Interconnection via Satellite Systems Using the IP Protocol Suite). Both symmetrical and asymmetrical connections are supported. Bandwidth on demand and guaranteed quality of service are key features of the system. A novel multi-frequency TDMA access scheme utilises efficient methods of IP encapsulation. In contrast to other solutions it avoids legacy transport network techniques. While the DVB-RCS standard is based on ATM or MPEG transport cells, the solution of the L*IP system uses variable-length cells which reduces the overhead significantly. A flexible and programmable platform based on Linux machines was chosen to allow the easy implementation and adaptation to different standards. This offers the possibility to apply the system not only to satellite communications, but provides seamless integration with terrestrial fixed broadcast wireless access systems. The platform is also an ideal test-bed for a variety of interactive broadband communications systems. The paper describes the system architecture and the key features of the system.

Koudelka, O.; Schmidt, M.; Ebert, J.; Schlemmer, H.; Kastner-Puschl, S.; Riedler, W.

2004-08-01

162

An advanced domestic satellite communications system  

NASA Technical Reports Server (NTRS)

An updated traffic projection for U.S. domestic satellite communications service covering a period of 15 years; mid-1980 to mid-1995 was prepared. This model takes into account expected technology advances and reductions in transmission costs, legislative and regulatory changes permitting increased competition, and rising energy costs which will encourage more extensive substitution of telecommunications for travel. The historical development and current status of satellite systems are discussed as well as the characteristics of follow-on systems. Orbital arc utilization, spacecraft configuration for single shuttle launch, Earth station configuration, and system costs are examined. Areas which require technology development include multiple beam frequency reuse antennas, on-board switching, intersatellite links, and ka-band operation. Packing and deployment schemes for enclosing the satellite within the shuttle orbiter bay must also be devised.

1980-01-01

163

A review of mobile satellite communication systems  

NASA Astrophysics Data System (ADS)

This article describes mobile satellite systems in the planning or development stage such as MSAT, AMSC and Geostar and mobile satellite communication experiments such as PRODAT. Studies on the system such as T-SAT are also reviewed. In addition, Japanese ETS-V and ETS-VI are described. The development of mobile-satellite communication systems is promoted along with those of communication and satellite technologies.

Kondo, Kimio

1990-03-01

164

The role of technology in influencing future civil communications satellites  

NASA Technical Reports Server (NTRS)

Technology, both as an enabler and as a driver of new and improved communication satellites, is discussed. A brief look at the beginnings and evolution of satellite communications is given to reveal the continuing influence of technology over the past 25 years. An assessment of the current state of the art which serves as a benchmark representing how far technology has come and as a basis for comparison for future possibilities is presented. A short tutorial on communications satellite basics is presented, followed by an assessment of technologies used for satellite antennas and signal amplification and routing. A discussion of future service requirements follows, and emerging technologies are identified along with possible improved communications capabilities that can result from them. The outlook for the role of technology for future communication satellites is summarized.

Bagwell, James W.; Mahle, Christoph E.

1990-01-01

165

The Impact of Satellites on Cable Communications.  

ERIC Educational Resources Information Center

Two recent developments in communications satellite technology may speed the coming of cable TV (CATV) networks. First, increases in satellite power are reducing the cost of ground stations. Second, a connection between one ground station, the satellite, and any other ground station is no longer necessarily fixed. Now one station can communicate

Chayes, Abram

166

Internetworking satellite and local exchange networks for personal communications applications  

NASA Technical Reports Server (NTRS)

The demand for personal communications services has shown unprecedented growth, and the next decade and beyond promise an era in which the needs for ubiquitous, transparent and personalized access to information will continue to expand in both scale and scope. The exchange of personalized information is growing from two-way voice to include data communications, electronic messaging and information services, image transfer, video, and interactive multimedia. The emergence of new land-based and satellite-based wireless networks illustrates the expanding scale and trend toward globalization and the need to establish new local exchange and exchange access services to meet the communications needs of people on the move. An important issue is to identify the roles that satellite networking can play in meeting these new communications needs. The unique capabilities of satellites, in providing coverage to large geographic areas, reaching widely dispersed users, for position location determination, and in offering broadcast and multicast services, can complement and extend the capabilities of terrestrial networks. As an initial step in exploring the opportunities afforded by the merger of satellite-based and land-based networks, several experiments utilizing the NASA ACTS satellite and the public switched local exchange network were undertaken to demonstrate the use of satellites in the delivery of personal communications services.

Wolff, Richard S.; Pinck, Deborah

1993-01-01

167

Educational Applications of Communications Satellites in Canada. New Technologies in Canadian Education Series. Paper 12.  

ERIC Educational Resources Information Center

Canada has explored the use of satellites as a means to provide information and communications services to geographically isolated populations since 1962. Between 1972 and 1984, five series of satellites known as Anik A, B, C, and D and Hermes were launched. Each satellite provided expanded communications services, and each led to research and…

Richmond, J. Murray

168

Technology requirements for communication satellites in the 1980's  

NASA Technical Reports Server (NTRS)

The key technology requirements are defined for meeting the forecasted demands for communication satellite services in the 1985 to 1995 time frame. Evaluation is made of needs for services and technical and functional requirements for providing services. The future growth capabilities of the terrestrial telephone network, cable television, and satellite networks are forecasted. The impact of spacecraft technology and booster performance and costs upon communication satellite costs are analyzed. Systems analysis techniques are used to determine functional requirements and the sensitivities of technology improvements for reducing the costs of meeting requirements. Recommended development plans and funding levels are presented, as well as the possible cost saving for communications satellites in the post 1985 era.

Burtt, J. E.; Moe, C. R.; Elms, R. V.; Delateur, L. A.; Sedlacek, W. C.; Younger, G. G.

1973-01-01

169

Information Delivery Through Broadcasting in Satellite Communication Networks  

E-print Network

Information Delivery Through Broadcasting in Satellite Communication Networks Leandros Tassiulas­range multicasting capability of satellites and the asymmetry of satellite communications (high bandwidth downlink. We consider a data broadcasting model that is encountered in most asymmetric satellite communication

Tassiulas, Leandros

170

Optimal Energy Allocation and Admission Control for Communications Satellites  

E-print Network

1 Optimal Energy Allocation and Admission Control for Communications Satellites Alvin Fu, Eytan control for communications satellites in earth orbit. These satellites receive requests for transmis- sion allocation problems in wireless commu- nications. Keywords-- Satellite, Communication, Resource Alloca- tion

Modiano, Eytan

171

A practical system for regional mobile satellite services  

NASA Technical Reports Server (NTRS)

The Regional Mobile Satellite (MSAT) concept proposes a worldwide, interconnected mobile satellite service (MSS) network in which MSAT-type satellites provide the space segment services to separate regions (i.e., one or a few countries). Using this concept, mobile communications users across entire continents can now be served by a handful of regionally controlled satellites in geostationary earth orbit (GEO). All requirements, including hand-held telephone capabilities, can be cost-effectively provided using proven technologies. While other concepts of regional or global mobile communications continue to be explored, the Hughes Regional MSAT system demonstrates the near-term viability of the GEO approach.

Glein, Randall; Leverson, Denis; Olmstead, Dean

1993-01-01

172

A new antenna concept for satellite communications  

NASA Technical Reports Server (NTRS)

A novel antenna configuration of two reflecting surfaces and a phased array is examined for application to satellite communications and shown to be superior in every respect to earlier designs for service to the continental United States from synchronous orbit. The vignetting that afflicts other two reflector optical systems is eliminated by use of a reflecting field element. The remaining aberrations, predominantly coma, are isolated in the time delay distribution at the surface of the array and can be compensated by ordinary array techniques. The optics exhibits infinite bandwidth and the frequency range is limited only by the design of the array.

Skahill, G.; Ciccolella, D.

1982-01-01

173

Experiments on aeronautical satellite communications using ETS-V satellite  

Microsoft Academic Search

The world's first aeronautical satellite communication experiments, conducted at L-band frequencies using a commercial aircraft, are described. An airborne antenna with electronically steerable beam and communication equipment was installed in a B-747F freighter flying over transoceanic flight routes. The satellite used in these experiments is the Engineering Test Satellite-Five (ETS-V). During the test period, various experiments, such as antenna pattern

S. Ohmori; Y. Hase; H. Wakana; S. Taira

1992-01-01

174

Broadband satellite communication ... -Google Livros Descrio geral  

E-print Network

Broadband satellite communication ... - Google Livros Descrição geral > Pré-visualização Críticas satellite communication ... - Google Livros Esta é uma pré-visualização. O total de páginas apresentadasC&printsec=frontcover&hl=pt-PT&source=gbs_v2_summary_r&cad=0 (2 of 28) [12-08-2009 11:21:11] #12;Broadband satellite communication ... - Google

Monteiro, Edmundo

175

DATA COMMUNICATION WITH A NANO-SATELLITE USING SATELLITE PERSONAL COMMUNICATION NETWORKS (S-PCNS).  

E-print Network

??Satellites typically communicate with locations on the ground to receive commands and send data back. Establishing reliable communications generally requires dedicated ground stations, which in… (more)

Khan, Khudeja

2008-01-01

176

Inflatable antennas for portable direct satellite communication.  

E-print Network

??Satellite-based communication system can provide access to voice, data, video and internet transmission that is independent of terrestrial infrastructure. This is particularly important in disaster… (more)

Mathers, N

2010-01-01

177

An optimization model of communications satellite planning  

NASA Astrophysics Data System (ADS)

A mathematical planning model is developed to help make cost effective decisions on key physical and operational parameters, for a satellite intended to provide customer premises services (CPS). The major characteristics of the model are: (1) interactions and tradeoffs among technical variables are formally captured; (2) values for capacity and operational parameters are obtained through optimization, greatly reducing the need for heuristic choices of parameter values; (3) effects of physical and regulatory constraints are included; and (4) the effects of market prices for transmission capacity on planning variables are explicitly captured. The model is solved optimally using geometric programming methods. Sensitivity analysis yields coefficients, analogous to shadow prices, that quantitatively indicate the change in objective function value resulting from variations in input parameter values. This helps in determining the robustness of planning decisions and in coping with some of the uncertainty that exists at the planning stage. The model can therefore be useful in making economically viable planning decisions for communications satellites.

Dutta, Amitava; Rama, Dasaratha V.

1992-09-01

178

47 CFR 25.145 - Licensing conditions for the Fixed-Satellite Service in the 20/30 GHz bands.  

Code of Federal Regulations, 2012 CFR

...145 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses Space...Licensing conditions for the Fixed-Satellite Service in the 20/30 GHz...

2012-10-01

179

47 CFR 25.145 - Licensing provisions for the Fixed-Satellite Service in the 20/30 GHz bands.  

Code of Federal Regulations, 2013 CFR

...145 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses Space...Licensing provisions for the Fixed-Satellite Service in the 20/30 GHz...

2013-10-01

180

47 CFR 25.145 - Licensing conditions for the Fixed-Satellite Service in the 20/30 GHz bands.  

Code of Federal Regulations, 2010 CFR

...145 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses Space...Licensing conditions for the Fixed-Satellite Service in the 20/30 GHz...

2010-10-01

181

47 CFR 25.145 - Licensing conditions for the Fixed-Satellite Service in the 20/30 GHz bands.  

Code of Federal Regulations, 2011 CFR

...145 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Applications and Licenses Space...Licensing conditions for the Fixed-Satellite Service in the 20/30 GHz...

2011-10-01

182

Interim Service ISDN Satellite (ISIS) hardware experiment design for advanced ISDN satellite design and experiments  

NASA Technical Reports Server (NTRS)

The Interim Service Integrated Services Digital Network (ISDN) Satellite (ISIS) Hardware Experiment Design for Advanced Satellite Designs describes the design of the ISDN Satellite Terminal Adapter (ISTA) capable of translating ISDN protocol traffic into time division multiple access (TDMA) signals for use by a communications satellite. The ISTA connects the Type 1 Network Termination (NT1) via the U-interface on the line termination side of the CPE to the V.35 interface for satellite uplink. The same ISTA converts in the opposite direction the V.35 to U-interface data with a simple switch setting.

Pepin, Gerard R.

1992-01-01

183

Interim Service ISDN Satellite (ISIS) hardware experiment development for advanced ISDN satellite designs and experiments  

NASA Technical Reports Server (NTRS)

The Interim Service Integrated Service Digital Network (ISDN) Satellite (ISIS) Hardware Experiment Development for Advanced Satellite Designs describes the development of the ISDN Satellite Terminal Adapter (ISTA) capable of translating ISDN protocol traffic into Time Division Multiple Access (TDMA) signals for use by a communications satellite. The ISTA connects the Type 1 Network Termination (NT1) via the U-interface on the line termination side of the CPE to the RS-499 interface for satellite uplink. The same ISTA converts in the opposite direction the RS-499 to U-interface data with a simple switch setting.

Pepin, Gerard R.

1992-01-01

184

The Mobile Satellite Services Market.  

ERIC Educational Resources Information Center

Mobile satellite (MSAT) technology is the basis for a new component of the telecommunications industry capable of providing services to small inexpensive subscriber terminals located almost any place in the world. The market for MSAT space segment capacity (bandwidth and power) is a natural monopoly that can be logically and technically…

Anderson, Samuel

185

An overview of the OmniTRACS: The first operational mobile Ku-band satellite communications  

NASA Technical Reports Server (NTRS)

The service features of the OmniTRACS system developed by Omninet Communications Services of Los Angeles, California are described. This system is the first operational mobile Ku-band satellite communications system that provides two-way messaging and position determination and reporting services to mobile users on a nationwide basis. The system uses existing Ku-band satellites under a secondary international allocation for mobile satellite services.

Salmasi, Allen

1988-01-01

186

A new phase for NASA's communications satellite program  

NASA Technical Reports Server (NTRS)

NASA's research in communications satellite technology is discussed, including orbit-efficient techniques and applications by the commercial sector. Attention is given to expanding the capacities of the C-band (6-4 GHz) and the Ku-band (14-11 GHz), opening the Ka-band (30/20 GHz), broadly applied 're-use' of the spectrum, and developing multibeam spacecraft antennas with on-board switching. Increasing wideband services in video, high-speed data, and voice trunking is considered, as are narrow-band systems that may be used for data collection or public safety, with possible expansion to a thin-route satellite system. In particular, communication for medical, disaster, or search-and-rescue emergencies may be met by the integration of a satellite service with land mobile communications via terrestrial radio links. Also considered is a large geostationary platform providing electrical power, thermal rejection, and orbital station-keeping for many communications payloads.

Dement, D. K.

1980-01-01

187

Federal Research and Development for Satellite Communications.  

ERIC Educational Resources Information Center

This report of the Committee on Satellite Communications (COSC) reviews a number of future communication needs which could be satisfied by satellite systems, including needs in fields such as education, health care delivery, hazard warning, navigation aids, search and rescue, electronic mail delivery, time and frequency dissemination, and…

National Academy of Sciences - National Research Council, Washington, DC. Assembly of Engineering.

188

NASA Compendium of Satellite Communications Programs  

NASA Technical Reports Server (NTRS)

A comprehensive review is presented of worldwide communication programs that range in time from the inception of satellite communications to August 1971. The programs included are: Echo, Courier, West Ford, Telstar, Relay, Syncom, Lincoln experimental satellites, Intelsat, Tacsat, Skynet, Nato system, and Telesat.

1973-01-01

189

Digital communications: Satellite\\/earth station engineering  

Microsoft Academic Search

The analysis and design of the elements of modern satellite communications systems are considered. Illustrative earth station and satellite communications subsystems are first introduced, and link budget calculations are discussed. Signal processing and multiplexing techniques used in terrestrial interface subsystems are described, as are baseband transmission systems principles and design techniques. The principles, performance analysis, and design tools of power-efficient

K. Feher

1983-01-01

190

Applications of MEMS in communication satellites  

Microsoft Academic Search

Micro-electro-mechanical-systems (MEMS) are finding more and more applications in microwave systems. Communications satellites, which typically have a large microwave hardware content, will be discussed as an example of these potential applications. In the first part, general MEMS technology and early examples will be described. Next, space applications of MEMS (sensors, actuators, propulsion etc.) in a communications satellite vehicle (bus) will

S. J. Fiedziuszko

2000-01-01

191

Photovoltaic solar arrays for communication satellites  

Microsoft Academic Search

Photovoltaic solar arrays are the principal means of converting solar energy to electrical energy for satellites. Array configurations depend on the spacecraft stabilization concept, orbit, and power requirements. The current generation of communication satellites are spin-stabilized in synchronous equatorial orbits; their arrays are spinning cylinders. As satellite power requirements increase, it is expected that the trend will be toward extendible

W. I. Berks; W. Luft

1971-01-01

192

Soviet satellite communications science and technology  

NASA Astrophysics Data System (ADS)

The current state of the art and projections of future Soviet satellite communications technologies are discussed. A panel of six U.S. scientists and engineers assessed the Soviet ability to support high-data-rate space missions at 128 Mbps by evaluating current and projected Soviet satellite communications technologies. A variety of space missions were considered, including Earth-to-Earth communications via satellites in geostationary or highly elliptical orbits, those missions that require space-to-Earth communications via a direct path, and those missions that require space-to-Earth communications via a relay satellite. Soviet satellite communications capability, in most cases, is 10 years behind that of the United States and other industrialized nations such as Japan, Italy, and France. However, based upon an analysis of communications links needed to support these missions, using current Soviet capabilities, it is well within the current Soviet technology to support certain space missions outlined above at rates of 128 Mbps or higher, although the published literature clearly shows that the Soviet Union has not exceeded 60 Mbps in its current space system. In response to decreased governmental support, the Soviet communications satellite industry is showing signs of some internal competition, is working on increasing communications satellite lifetime, and is also striving to develop joint ventures with Western firms.

Birch, J. N.; Campanella, S. J.; Gordon, G. S.; McElroy, D. R.; Pritchard, W. L.

1991-08-01

193

Achieving QoS for TCP traffic in Satellite Networks with Differentiated Services Arjan Durresi1  

E-print Network

intersatellite links, advanced link access methods and multicast technologies. Many new satellite communication. However, satellite systems have several inherent constraints. The resources of the satellite communication1 Achieving QoS for TCP traffic in Satellite Networks with Differentiated Services Arjan Durresi1

Durresi, Arjan

194

Issues in satellite packet video communication  

Microsoft Academic Search

Recent advances in packet communication over satellite links make it now possible, for the first time, to seriously consider the application of this technology to real-time video transmission. Unfortunately, packet communication over satellite links poses several severe problems for real-time video applications: the data rate available on packet satellite links is usually below what is required for real-time video applications;

S. L. Casner; D. Cohen; E. R. Cole

1983-01-01

195

78 FR 70237 - Operation of Wireless Communications Services in the 2.3 GHz Band; Establishment of Rules and...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Operation of Wireless Communications Services in the...Digital Audio Radio Satellite Service in the 2310-2360...AGENCY: Federal Communications Commission. ACTION...Title: Part 25--Satellite Communications; and part...

2013-11-25

196

Space industrialization - Education. [via communication satellites  

NASA Technical Reports Server (NTRS)

The components of an educational system based on, and perhaps enhanced by, space industrialization communications technology are considered. Satellite technology has introduced a synoptic distribution system for various transmittable educational media. The cost of communications satellite distribution for educational programming has been high. It has, therefore, been proposed to utilize Space Shuttle related technology and Large Space Structures (LSS) to construct a system with a quantum advancement in communication capability and a quantum reduction in user cost. LSS for communications purposes have three basic advantages for both developed and emerging nations, including the ability to distribute signals over wide geographic areas, the reduced cost of satellite communications systems versus installation of land based systems, and the ability of a communication satellite system to create instant educational networks.

Joels, K. M.

1978-01-01

197

Advanced satellite servicing facility studies  

NASA Technical Reports Server (NTRS)

A NASA-sponsored systems analysis designed to identify and recommend advanced subsystems and technologies specifically for a manned Sun-synchronous platform for satellite management is discussed. An overview of system design, manned and unmanned servicing facilities, and representative mission scenarios are given. Mission areas discussed include facility based satellite assembly, checkout, deployment, refueling, repair, and systems upgrade. The ferrying of materials and consumables to and from manufacturing platforms, deorbit, removal, repositioning, or salvage of satellites and debris, and crew rescue of any other manned vehicles are also examined. Impacted subsytems discussed include guidance navigation and control, propulsion, data management, power, thermal control, structures, life support, and radiation management. In addition, technology issues which would have significant impacts on the system design are discussed.

Qualls, Garry D.; Ferebee, Melvin J., Jr.

1988-01-01

198

Turbo-Coded APSK Modulations Design for Satellite Broadband Communications  

E-print Network

Turbo-Coded APSK Modulations Design for Satellite Broadband Communications Riccardo De Gaudenzi with application to satellite broad- band communications. APSK represents an attractive modulation format systems. 1 Introduction Satellite communication systems strength lies in their ability to efficiently

Guillén i Fàbregas, Albert

199

Satellite Communication Hardware Emulation System (SCHES)  

NASA Technical Reports Server (NTRS)

Satellite Communication Hardware Emulator System (SCHES) is a powerful simulator that emulates the hardware used in TDRSS links. SCHES is a true bit-by-bit simulator that models communications hardware accurately enough to be used as a verification mechanism for actual hardware tests on user spacecraft. As a credit to its modular design, SCHES is easily configurable to model any user satellite communication link, though some development may be required to tailor existing software to user specific hardware.

Kaplan, Ted

1993-01-01

200

Satellite servicing: A business opportunity?  

NASA Technical Reports Server (NTRS)

The possibilities of satellite servicing as a business opportunity are examined. The service rate which a user must be charged to yield a reasonable return is derived and then compared against the market's willingness to pay that rate. Steps taken to provide the basis from which the service rate could be derived include: (1) constructing a hypothetical on orbit servicing business offering both on orbit and associated ground services; (2) estimating the total on orbit service business potential by analyzing mission models to the year 2000; and (3) setting up ground rules to bound the conduct of the business. Using this basic information service demand (business volume) cost to set up the business, costs for operation and maintenance tax rates and desired rate of return are estimated to determine the user charge. Sensitivity of the service rate to various parameters are also assessed. The time span for the business venture runs from 1986 through 2000 with service to 1991 provided via the orbiter and by a space station beyond 1991. This point analysis shows about five years of negative cash flow, with steady profits thereafter.

Wong, R. E.; Medler, E. H.

1984-01-01

201

Issues in satellite personal communication systems  

Microsoft Academic Search

In the paper various issues in personal satellite communications are addressed. Basic geostationary and non?geostationary\\u000a satellite constellations are considered. The narrowband and wideband characterization of the mobile satellite channel and\\u000a related system implications are discussed. Satellite diversity is presented as a measure to overcome signal shadowing. The\\u000a capacity of TDMA and CDMA multiple access is estimated, taking into account co?channel

Erich Lutz

1998-01-01

202

Satellite-aided mobile communications, experiments, applications and prospects  

NASA Technical Reports Server (NTRS)

NASA's ATS-series of satellites were used in a series of communications and position fixing experiments with automotive vehicles, ships and aircraft. Applications of the communications were demonstrated and evaluated for public services including law enforcement, search and rescue, and medical emergency, and for commercial uses in the land and maritime transportation industries. The technical success of the experiments and the demonstrated potential value of the communications prompted a study that concluded an operational satellite-aided system would be a valuable augmentation of planned trunking or cellular type terrestrial mobile radio telephone systems.

Anderson, R. E.; Frey, R. L.; Lewis, J. R.; Milton, R. T.

1980-01-01

203

Emerging technologies for communication satellite payloads  

NASA Astrophysics Data System (ADS)

Recent developments in payload designs will allow more flexible and efficient use of telecommunication satellites. Important modifications in repeater designs, antenna structures and spectrum policies open up exciting opportunities for GEO satellites to support a variety of emerging applications, ranging from telemedicine to real-time data transfer between LEO satellite and ground station. This study gives information about the emerging technologies in the design of communication satellites' transceiver subsystem and demonstrates the feasibility of using fiber optic links for the local oscillator distribution in future satellite payloads together with the optical inter-satellite link.

Yüceer, Mehmet

2012-04-01

204

Land Mobile Satellite Service (LMSS) channel simulator: An end-to-end hardware simulation and study of the LMSS communications links  

NASA Technical Reports Server (NTRS)

The design and implementation of the Land Mobile Satellite Service (LMSS) channel simulator as a facility for an end to end hardware simulation of the LMSS communications links, primarily with the mobile terminal is described. A number of studies are reported which show the applications of the channel simulator as a facility for validation and assessment of the LMSS design requirements and capabilities by performing quantitative measurements and qualitative audio evaluations for various link design parameters and channel impairments under simulated LMSS operating conditions. As a first application, the LMSS channel simulator was used in the evaluation of a system based on the voice processing and modulation (e.g., NBFM with 30 kHz of channel spacing and a 2 kHz rms frequency deviation for average talkers) selected for the Bell System's Advanced Mobile Phone Service (AMPS). The various details of the hardware design, qualitative audio evaluation techniques, signal to channel impairment measurement techniques, the justifications for criteria of different parameter selection in regards to the voice processing and modulation methods, and the results of a number of parametric studies are further described.

Salmasi, A. B. (editor); Springett, J. C.; Sumida, J. T.; Richter, P. H.

1984-01-01

205

Hybrid system of communication and radio determination using two geostationary satellites  

NASA Technical Reports Server (NTRS)

A new hybrid satellite system which can provide both communications and positioning services in one system using two geostationary satellites is discussed. The distinctive feature is that location information can be provided by transmitting and receiving ranging signals over the same channel as communications through two geostationary satellites.

Ohmori, Shingo; Matsumoto, Yasushi; Morikawa, Eihisa; Wakao, Masayoshi

1990-01-01

206

A Dynamic Routing Concept for ATM-Based Satellite Personal Communication Networks  

Microsoft Academic Search

Satellite systems are going to build a part of the future personal communications infrastructure. The first-generation candidates for satellite personal communication networks (S-PCN) will rely on low Earth orbit (LEO) and medium Earth orbit (MEO) constellations. A noticeable trend in this field is toward broadband services and the use of ATM. For LEO satellite systems employing intersatellite links (ISLs), this

Markus Werner

1997-01-01

207

22nd AIAA International Communications Satellite Systems Conference & Exhibit 2004 9.12 May 2004, Monterey, California  

E-print Network

22nd AIAA International Communications Satellite Systems Conference & Exhibit 2004 9.12 May 2004. Barast Departmentof Electrical and Computer Engineering and Centerfor Satellite and Hybrid Communication communication has placed focus on communication satellites as an efficient way to extend the multicast services

Baras, John S.

208

Giant step for communication satellite technology  

NASA Technical Reports Server (NTRS)

NASA's communications program, which is concerned with advanced communications technology, reflects the need for operational communications satellite capacity beyond the capabilities of current technology and the unwillingness of private industry in the U.S. to undertake making the required long-range, high-risk technology advances. It is pointed out that current satellites will not satisfy the forecasted demand for additional capacity in the 1990s and beyond. Current technology exists primarily up to 18 GHz. Designing a communications satellite at each of the three major uplink/downlink frequency bands (C, Ku, and Ka, 6/4 GHz, 14/11 GHz, and 30/20 GHz, respectively) presents different program management and technical problems. Increasing frequency or power can be done only by intensive sustained research. This is the rationale for NASA to pursue the Advanced Communications Technology Satellite (ACTS) program.

Lovell, R. R.

1984-01-01

209

Satellite fixed communications service: A forecast of potential domestic demand through the year 2000. Volume 3: Appendices  

NASA Technical Reports Server (NTRS)

Voice applications, data applications, video applications, impacted baseline forecasts, market distribution model, net long haul forecasts, trunking earth station definition and costs, trunking space segment cost, trunking entrance/exit links, trunking network costs and crossover distances with terrestrial tariffs, net addressable forecasts, capacity requirements, improving spectrum utilization, satellite system market development, and the 30/20 net accessible market are considered.

Kratochvil, D.; Bowyer, J.; Bhushan, C.; Steinnagel, K.; Kaushal, D.; Al-Kinani, G.

1983-01-01

210

Program on application of communications satellites to educational development  

NASA Technical Reports Server (NTRS)

Interdisciplinary research in needs analysis, communications technology studies, and systems synthesis is reported. Existing and planned educational telecommunications services are studied and library utilization of telecommunications is described. Preliminary estimates are presented of ranges of utilization of educational telecommunications services for 1975 and 1985; instructional and public television, computer-aided instruction, computing resources, and information resource sharing for various educational levels and purposes. Communications technology studies include transmission schemes for still-picture television, use of Gunn effect devices, and TV receiver front ends for direct satellite reception at 12 GHz. Two major studies in the systems synthesis project concern (1) organizational and administrative aspects of a large-scale instructional satellite system to be used with schools and (2) an analysis of future development of instructional television, with emphasis on the use of video tape recorders and cable television. A communications satellite system synthesis program developed for NASA is now operational on the university IBM 360-50 computer.

Morgan, R. P.; Singh, J. P.

1971-01-01

211

Developments in land mobile satellite service in Europe  

NASA Technical Reports Server (NTRS)

The evolution of land mobile radio has reached a stage to benefit from satellite communications. The provision of a service on a pan-European basis makes the use of satellites a viable proposition. The paper describes the European position on both system and space segment aspects of the land mobile satellite service. Also, some of the functions of the European institutions, such as the European Telecommunications Standards Institute (ETSI), the Conference of European Postal and Telecommunications Administrations (CEPT), and the Commission of European Communities (CEC), in establishing these services are identified.

Jayasuriya, D. A. R.

1990-01-01

212

Recent Korean R&D in Satellite Communications  

NASA Astrophysics Data System (ADS)

The R&D in satellite communications in Korea has been driven mainly by KCC (Korea Communications Commission) but in a small scale compared to Korea space development program organized by MEST (Ministry of Education, Science and Technology). Public and civilian satcom sector R&D has been led mainly by ETRI with small/medium companies contrary to rare investment in private sector while military sector R&D has been orchestrated by ADD with defense industry. By the COMS (Communication, Ocean and Meteorological Satellite) experimental Ka-band payload, Korea pursues a space qualification of own technology for national infrastructure evolution as well as industrialization of space R&D results. Once COMS launched and space qualified in 2009, subsequent application experiments and new technology R&D like UHDTV will entail service and industry promotion. The payload technology is expected for the next Korean commercial satellites or for new OBP satellites. The COMS ground control system and GNSS ground station technologies are under development for COMS operation and enhanced GNSS services along with advent of Galileo respectively. Satellite broadband mobile VSAT based on DVB-S2/RCS (+M) and low profile tracking antennas have been developed for trains, ships, and planes. While APSI is developing GMR-1 based Thuraya handset functions, ETRI is designing IMT-Advanced satellite radio interface for satellite and terrestrial dual-mode handheld communication system like Japanese STICS, with universities' satellite OFDM researches. A 21GHz Ka-band higher-availability scalable HD broadcasting technology and SkyLife's hybrid satellite IPTV technology are being developed. In near term Korea will extend R&D programs to upgrade the space communication infrastructure for universal access to digital opportunity and safer daily life from disaster, and to promote space green IT industrialization, national security, and space resources sovereign. Japanese stakeholders are invited to establish a collaborative R&D with Korea for mutual benefit of the future.

Lee, Ho-Jin; Kim, Jae Moung; Lee, Byung-Seub; Lee, Han; Ryoo, Jang-Soo

213

Communication Capacity Optimization for Broadband Satellite Communication Systems  

NASA Astrophysics Data System (ADS)

ground-based access systems, such as FTTH, ADSL and even terrestrial cellular systems, are only available within limited geographical areas, broadband satellite communication systems that can cover unlimited service area have attracted wide interest. However, the success of broadband satellite communication depends heavily on the cost of user terminals and satellite circuits. and frequency bandwidth, which involves design parameters. For such parameters, we must consider modulation, coding, the number of radiating beams and the number of areas in which frequency bandwidth can be reused. These parameters should be chosen such that maximum communication capacity can be provided with minimum system resources under a designated rain attenuation and interference environment. The difficulty in optimization stems from the number of design parameters and the interactions between them. The optimization also has to be done in a manner such that the service provider can determine the relation between the service cost and the service grade. The service grade can be expressed in terms of the available user information rate, return link as well as forward link, and the number of available communication channels, while the system cost can be expressed in terms of required satellite power and the bandwidth. power and bandwidth parameters. In the method, the number of spot beams, the number of repeated bandwidth areas and the type of modulation are separately determined for the return and forward link. From the selected design parameters, the relationship between bandwidth capacity and power capacity is derived assuming they are linear. The power and bandwidth required for the return and forward link are then integrated by applying a linear programming method. The constraints in linear programming are power and bandwidth. To denote the system resource management proficiency, we introduce an index called power-utilization efficiency, which is a ratio of the maximum capacity to the required power. systems that have 15 or 35 spot beams. Since circuit quality degradation in Ku band systems due to the propagation environments is less than that in Ka band systems, the power-utilization efficiency of the Ku band is 1.25 times more that of the Ka band. On the other hand, the total capacity of the Ka band is 3.5 times that of the Ku band since the allocated bandwidth in the Ku band is narrower than that of the Ka band. Bandwidth reuse is an effective way to increase total available bandwidth. For the same service area and the same number of reused bandwidths, increasing the number of spot beams can reduce the interference between different areas assigned the same frequency, since the distance between those areas widens. This enables total capacity and power-utilization efficiency for a 35-spot-beam system to be more than 2.2 and 2.75 times greater, respectively, than for a 15-spot-beam system. limited transmission power of the user terminal. Therefore, the return link transponder requires a higher transmission power level to compensate for this limitation. On the other hand, a high-quality downlink is also required for the forward link because of the small size of the user terminal antenna. However, the quality of the forward link can be maintained since it is possible to increase uplink quality by improving hub-station performance. This makes it possible to suppress the increase in the transmission power of the forward link transponder in comparison with that of the return link transponder. As an example, we compared two cases, in one of which the capacity ratio (forward link capacity divided by the return link capacity) was 2.0 and in the other of which it was 10.0. We found that the amount of capacity and power utilization efficiency were, respectively, 33% and 50% greater for the latter case than for the former case. applications.

Nakasuga, Yoshinori; Mitsugi, Jin; Ueba, Masazumi; Mizuno, Hideki

2002-01-01

214

Continuation of the compendium of applications technology satellite and communications technology satellite user experiments 1967-1977, volume 1  

NASA Technical Reports Server (NTRS)

User experiments conducted utilizing the Applications Technology Satellites (ATS) 1, 3, 5, and 6 and the Communications Technology Satellite are summarized. The experiments are grouped by type of service offered. For example: education, health services, and data transmission. Particular emphasis is given to summarizing and evaluating user attitudes toward the ATS program.

Engler, N. A.; Nash, J. F.; Strange, J. D.

1978-01-01

215

A figure of merit for competing communications satellite designs  

NASA Technical Reports Server (NTRS)

Trends in launch schedules, weights, power, and space segment costs per transponder year for Intelsats and North American domsats (domestic communications satellites) are discussed. The Intelsat system currently services 25,000 point to point telephone links at any one moment, and a $3 billion order has been placed for Intelsat VIs, which feature 36,000 telephone circuits each. The Intelsat VI spacecraft will weigh 1670 kg in orbit, a continuance of the trend to heavier satellites, while the domsats will stay at 650 kg due to launch vehicle limitations. Direct television broadcast satellites are being designed for receive only (R/O) earth stations, with each satellite capable of servicing 50,000 individual ground stations. Competition is growing for C and Ku band satellite transponders for DBS, with costs $350,000 each. No standardized design has yet emerged.

Lovell, R. R.; Fordyce, S. W.

1983-01-01

216

Communication satellites: Guidelines for a strategic plan  

NASA Technical Reports Server (NTRS)

To maintain and augment the leadership that the United States has enjoyed and to ensure that the nation is investing sufficiently and wisely to this purpose, a strategic plan for satellite communications research and development was prepared by NASA. Guidelines and recommendations for a NASA plan to support this objective and for the conduct of communication satellite research and development program over the next 25 years were generated. The guidelines are briefly summarized.

1987-01-01

217

The use of satellites in non-goestationary orbits for unloading geostationary communication satellite traffic peaks. Volume 2: Technical report  

NASA Technical Reports Server (NTRS)

The part of the geostationary (GEO) orbital arc used for United States domestic fixed, communications service is rapidly becoming filled with satellites. One of the factors currently limiting its utilization is that communications satellites must be designed to have sufficient capacity to handle peak traffic leads, and thus are under utilized most of the time. A solution is to use satellites in suitable non-geostationary orbits to unload the traffic peaks. Three different designs for a non-geostationary orbit communications satellite system are presented for the 1995 time frame. The economic performance is analyzed and compared with geostationary satellites for two classes of service, trunking and customer premise service. The result is that the larger payload of the non-geostationary satellite offsets the burdens of increased complexity and worse radiation environment to give improved economic performance. Depending on ground terminal configuration, the improved economic performance of the space segment may be offset by increased ground terminal expenses.

Price, K.; Turner, A.; Nguyen, T.; Doong, W.; Weyandt, C.

1987-01-01

218

Sharing Resources In Mobile/Satellite Communications  

NASA Technical Reports Server (NTRS)

Report presents preliminary theoretical analysis of several alternative schemes for allocation of satellite resource among terrestrial subscribers of landmobile/satellite communication system. Demand-access and random-access approaches under code-division and frequency-division concepts compared.

Yan, Tsun-Yee; Sue, Miles K.

1992-01-01

219

Multiple access studies of multibeam communication satellites  

Microsoft Academic Search

The next generations of communications satellites are expected to employ satellite switched multiple spot beams to increase the system. The use of multiple spot beam systems in a packet switched environment with a large number of small bursty users is studied. A system is considered which achieves frequency reuse by using sub 2 nonoverlapping spot beams with sub T frequency

J. G. Garde

1981-01-01

220

The Arctic Regional Communications Small SATellite (ARCSAT)  

NASA Technical Reports Server (NTRS)

Traditional satellite missions are extremely complex and expensive to design, build, test, launch and operate. Consequently many complementary operational, exploration and research satellite missions are being formulated as a growing part of the future space community capabilities using formations of small, distributed, simple to launch and inexpensive highly capable small scale satellites. The Arctic Regional Communications small SATellite (ARCSAT) initiative would launch a Mini-Satellite "Mothership" into Polar or Sun Sync low-earth-orbit (LEO). Once on orbit, the Mothership would perform orbital insertion of four internally stored independently maneuverable nanosatellites, each containing electronically steerable antennas and reconfigurable software-defined radios. Unlike the traditional geostationary larger complex satellite communication systems, this LEO communications system will be comprised of initially a five small satellite formation that can be later incrementally increased in the total number of satellites for additional data coverage. ARCSAT will provide significant enabling capabilities in the Arctic for autonomous voice and data communications relay, Maritime Domain Awareness (MDA), data-extraction from unattended sensors, and terrestrial Search & Rescue (SAR) beacon detection missions throughout the "data starved desert" of the Arctic Region.

Casas, Joseph; Kress, Martin; Sims, William; Spehn, Stephen; Jaeger, Talbot; Sanders, Devon

2013-01-01

221

The role of rain in satellite communications  

Microsoft Academic Search

The most fundamental obstacle encountered in design of satellite communication systems at frequencies above 10 GHz is attenuation by rain. The microwave power radiated toward an earth station, being limited by factors such as available primary power and size of antenna on the satellite, is insufficient, with present technology, to overcome the large attenuation produced by intense rain cells on

D. C. Hogg; Ta-Shing Chu

1975-01-01

222

Introduction to Satellite Communications Technology for NREN  

NASA Technical Reports Server (NTRS)

NREN requirements for development of seamless nomadic networks necessitates that NREN staff have a working knowledge of basic satellite technology. This paper addresses the components required for a satellite-based communications system, applications, technology trends, orbits, and spectrum, and hopefully will afford the reader an end-to-end picture of this important technology.

Stone, Thom

2004-01-01

223

Advances in multibeam communications satellite antennas  

Microsoft Academic Search

The evolution of satellite antennas over the past quarter of a century is presented. Five major areas of advances in communications satellite antenna technology are reviewed: single offset reflectors with feed arrays, shaped reflector systems, active phased arrays, phased-array-fed dual reflector systems, and lightweight feed elements. Examples are given of existing systems and of the ongoing development of new technologies

A. I. Zaghloul; Y. Hwang; R. M. Sorbello; F. T. Assal

1990-01-01

224

Phased array aircraft antennas for satellite communications  

Microsoft Academic Search

A number of critical issues facing designers of aircraft antenna terminals for satellite communication are considered, taking into account a number of efforts aimed at the development of high gain, flush mounted phased array antennas which would eliminate the need for a cumbersome radome. An investigation is conducted regarding the geometrical requirements of a pencil beam aircraft antenna for satellite

R. J. Mailloux

1977-01-01

225

Satellite Communication and Development: A Reassessment.  

ERIC Educational Resources Information Center

The potential benefits of satellite communications development have been recognized since the notion of a geostationary "space platform" was proposed by Arthur C. Clarke in 1945. Although there have been examples of developmental applications of satellite technology, the promise has been slow in being fulfilled. The history of the application of…

Hudson, Heather E.

226

Narrow-Band Applications of Communications Satellites.  

ERIC Educational Resources Information Center

This paper attempts to describe the advantages of "narrow-band" applications of communications satellites for education. It begins by discussing the general controversy surrounding the use of satellites in education, by placing the concern within the larger context of the general debate over the uses of new technologies in education, and by…

Cowlan, Bert; Horowitz, Andrew

227

Polarization tracking for quantum satellite communications  

NASA Astrophysics Data System (ADS)

Satellite networks and quantum communications offer complementary opportunities for enhanced operations. Quantum communications provide security for the transmissions between satellites and ground stations; while the free-space link of satellite networks provide the potential of long distance transmission of quantum bits (qubit) for space communications. However, with the promising advantages of the two approaches, challenges remain to fully develop quantum-based satellite communications such as robust and reliable information detection which is difficult to achieve due to the movement of satellites. In this paper, a tracking algorithm is proposed for polarization-encoded quantum satellite communications where polarization states are used to determine the bit transfer between the transmitter and receiver. The polarization tracking is essential for the decoding of a qubit and the quantum key distribution (QKD). A practical channel model for free-space quantum communications is adopted in this paper. With the estimated polarization, a novel dynamic polarization compensation scheme is also proposed. The results show that our methods can accurately estimate the polarization, providing much lower quantum bit error rate (QBER) by compensation, as compared with the direct qubit detection without polarization tracking and compensation scheme.

Wang, Gang; Shen, Dan; Chen, Genshe; Pham, Khanh; Blasch, Erik

2014-06-01

228

76 FR 57923 - Establishment of Rules and Policies for the Satellite Digital Audio Radio Service in the 2310...  

Federal Register 2010, 2011, 2012, 2013, 2014

...FEDERAL COMMUNICATIONS COMMISSION 47 CFR Part 25...Rules and Policies for the Satellite Digital Audio Radio Service...Frequency Band AGENCY: Federal Communications Commission. ACTION: Final...requirements contained in the Satellite Digital Audio Radio...

2011-09-19

229

A small terminal for satellite communication systems  

NASA Technical Reports Server (NTRS)

A small portable, low-cost satellite communications terminal system incorporating a modulator/demodulator and convolutional-Viterbi coder/decoder is described. Advances in signal processing and error-correction techniques in combination with higher power and higher frequencies aboard satellites allow for more efficient use of the space segment. This makes it possible to design small economical earth stations. The Advanced Communications Technology Satellite (ACTS) was chosen to test the system. ACTS, operating at the Ka band incorporates higher power, higher frequency, frequency and spatial reuse using spot beams and polarization.

Xiong, Fuqin; Wu, Dong; Jin, Min

1994-01-01

230

Texas Telecommunication Satellite Demonstration Project. Planning Effort for Application of Communication Satellites in Education.  

ERIC Educational Resources Information Center

The primary goal of the Texas Telecommunication Satellite Demonstration consortium is to install, operate, and evaluate a comprehensive communication service delivery system which would provide the citizens of Texas with greater opportunity for equal access to education and information. The four major objectives of the demonstration are (1) to…

Education Service Center Region 4, Houston, TX.

231

Traveling wave tubes for communication satellites  

Microsoft Academic Search

Traveling wave tubes (TWT's) have contributed markedly to the development of communications satellites. As the prime-power consuming and transmitting device, the major transponder gain element, and the largest contributor to transmission nonlinearities, the TWT has been the focal point for continuous but carefully measured evolutionary improvements. Efficiency improvements continue to be made without compromising desired communications characteristics or tube lifetimes.

ROBERT STRAUSS; JORK BRETTING; ROBERT METIVIER

1977-01-01

232

Cultural Effects and Uses of Communication Satellites.  

ERIC Educational Resources Information Center

The communication satellite already has developed a mature technology. It carries a substantial part of the world's long range communication, and is now useable for special cultural and educational purposes. Major cultural effects come from its contribution to increasing enormously the flow of information in the world. It will increase human…

Schramm, Wilbur

233

An Educator's Guide to Communication Satellite Technology.  

ERIC Educational Resources Information Center

Recent developments in the area of sophisticated communications technology present challenges to the imagination of every educator. This guide provides educational planners with an awareness and understanding of communication satellite technology, its current uses, and some of the tentative plans for educational experimentation. The first part…

Polcyn, Kenneth A.

234

Satellite Communications in the 1980's.  

ERIC Educational Resources Information Center

Space communications have developed tremendously since 1963 when the National Aeronautics and Space Administration (NASA) launched the synchronous communication satellite, Syncom II, into geostationary orbit. The capacity of that spacecraft was one two-circuit voice channel. Intelsat V, launched in 1980, has a capacity of 12,000 circuits plus two…

Usunier, Pierre

235

Domestic satellite services for rural areas  

NASA Astrophysics Data System (ADS)

It is pointed out that rural areas can be served by a domestic satellite communications system in an efficient and economical manner. To accomplish such efficiency and economy, the engineering parameters of the satellite communications system must be analyzed and selected with a view toward achieving the desired performance at minimum total cost. The equipment for an entire rural satellite communication system serving 1200 communities can be acquired for approximately $200 million (1983 dollars). An identical system, however, could also be implemented at much lower capital costs by leasing space segment capacity from existing satellite systems (Briskman and Savage, 1983).

Briskman, R. D.

1984-03-01

236

High-speed satellite mobile communications: technologies and challenges  

Microsoft Academic Search

Central features of future 4G mobile communication systems are high-speed data transmission (up to 1 Gb\\/s) and interactive multimedia services. For effective delivery of these services, the network must satisfy some stringent QoS metrics, defined typically in terms of maximum delay and\\/or minimum throughput. Mobile satellite systems will be fully integrated with the terrestrial cellular systems to provide ubiquitous global

MOHAMED IBNKAHLA; QUAZI MEHBUBAR RAHMAN; AHMED IYANDA SULYMAN; HISHAM ABDULHUSSEIN AL-ASADY; Jun Yuan; AHMED SAFWAT

2004-01-01

237

The Globalstar mobile satellite system for worldwide personal communications  

NASA Astrophysics Data System (ADS)

Loral Aerospace Corporation along with Qualcomm Inc. have developed a satellite system which offers global mobile voice and data services to and from handheld and mobile user terminals with omni-directional antennas. By combining the use of low-earth orbit (LEO) satellites with existing terrestrial communications systems and innovative, highly efficient spread spectrum techniques, the Globalstar system provides users with low-cost, reliable communications throughout the world. The Globalstar space segment consists of a constellation of 48 LEO satellites in circular orbits with 750 NM (1389 km) altitude. Each satellite communicates with the mobile users via the satellite-user links and with gateway stations. The gateway stations handle the interface between the Globalstar network and the OSTN/PLMN systems. Globalstar transceivers are similar to currently proposed digital cellular telephones in size and have a serial number that will allow the end user to make and receive calls from or to that device anywhere in the world. The Globalstar system is designed to operate as a complement to existing local, long-distance, public, private and specialized telecommunications networks. Service is primarily designed to serve the rural and thin route communications needs of consumers, government users, and private networks.

Wiedeman, Robert A.; Viterbi, Andrew J.

238

The future for domestic communications satellites - Lease or buy  

NASA Astrophysics Data System (ADS)

The demand for leased satellite communications services is growing at such a rate that a dedicated leasing satellite system is envisioned to deal with the demand. The most economical solution would be three similarly designed 24-channel capacity satellites with on-orbit antenna beam reconfiguration offering regional C-band coverage and situated over America, Africa, and Asia. Spatial frequency reuse is not considered necessary until at least the next generation. A two-meter antenna projecting a three dB beamwidth nearly three degrees in diameter at 4 GHz can achieve global coverage with only 19 adjacent beams at the aforementioned locations. Circular polarization will be continued in leasing. It is proposed to operate dual orthogonal polarization frequency reuse for uplink and downlink to increase the available capacity. The communications repeater is discussed in detail together with a glossary of terms and an economic analysis of the competition from dedicated domestic satellites.

Rooney, K. J.

1982-04-01

239

Photogrammetric mobile satellite service prediction  

NASA Technical Reports Server (NTRS)

Photographic images of the sky were taken with a camera through a fisheye lens with a 180 deg field-of-view. The images of rural, suburban, and urban scenes were analyzed on a computer to derive quantitative information about the elevation angles at which the sky becomes visible. Such knowledge is needed by designers of mobile and personal satellite communications systems and is desired by customers of these systems. The 90th percentile elevation angle of the skyline was found to be 10 deg, 17 deg, and 51 deg in the three environments. At 8 deg, 75 percent, 75 percent, and 35 percent of the sky was visible, respectively. The elevation autocorrelation fell to zero with a 72 deg lag in the rural and urban environment and a 40 deg lag in the suburb. Mean estimation errors are below 4 deg.

Akturan, Riza; Vogel, Wolfhard J.

1994-01-01

240

Positioning determination and communications using two geostationary satellites  

NASA Astrophysics Data System (ADS)

A hybrid satellite communication system has been developed which can provide both communications and positioning services in one system using two geostationary satellites. The experimental system consists of the ETS-V (150 deg E) and INMARSAT (180 deg E), a base earth station (Kashima Space Research Center, Japan), and mobile earth stations. The frequencies between the satellites and mobile stations are 1.6/1.5 GHz. The distinctive feature of this system is that position determination of the mobile earth stations and communication, such as voice and data transmission, can be carried out over the same channel at the same time. Another feature is that the frequency bandwidth of the system is very narrow compared to those of GPS and GEOSTAR. The two types of terminals developed for the experiments with this hybrid system use the single channel per carrier method and the spread spectrum method. An outline of the experimental system is presented, and the estimated positioning accuracy is described.

Morikawa, Eihisa; Miura, Ryu; Kimura, Kazuhiro; Kawase, Seiichiro; Ohmori, Shingo; Matsumoto, Yasushi; Wakao, Masayoshi

1992-07-01

241

High-Latitude Communications Satellite (HILACS)  

NASA Technical Reports Server (NTRS)

The Naval Postgraduate School in the AE 4871 Advanced Spacecraft Design course designed a communications satellite (HILACS) that will provide a continuous UHF communications link between stations located north of the region covered by geosynchronous communications satellites. The communications payload will operate only for that portion of the orbit necessary to provide specific coverage. The satellite orbit is elliptic with perigee at 1204 km in the Southern Hemisphere and an apogee at 14,930 km with 63.4 degrees inclination. Analysis and design of each of the subsystems was done to the extent possible within the constraints of an eleven week quarter and the design and analysis tools available. Work was completed in orbital analysis, the reaction control system, attitude control subsystem, electric power subsystem, telemetry, tracking, and control, thermal control subsystem, and the structures subsystem. The design team consisted of 12 students. Additional support was provided by the Jet Propulsion Laboratory and the Naval Research Laboratory.

1990-01-01

242

Satellite services for disaster management and security applications  

NASA Astrophysics Data System (ADS)

Advantages of communications satellites are the inherent broadcast capability, high bandwidth, reliability and flexibility in network expansion. Small transportable terminals can be made operational very quickly. Recent developments in communications and computer technology allow to provide low-cost equipment, which is affordable even in developing countries. Communications satellites can also play an important role in case of emergencies or natural disasters. The combination of satellite communications and navigation can support new services for emergency teams. At the Institute of Applied Systems Technology and the Institute of Communication Networks and Satellite Communications highly transportable terminals have been developed, both for star and mesh network topologies. A fully meshed VSAT system is used for symmetrical links. For other applications, which do not require high return link capacity an asymmetrical system is an efficient solution. It uses low-cost DVB technology for the forward link and satellite phones with data capability on the return link. Novel multicast protocols allow to use these asymmetrical links in an efficient way. The paper describes the different systems and their applications in disaster management and security applications. Emphasis is put on transfer of remote sensing images and voice over IP (VoIP) as well as videoconference services.

Koudelka, Otto; Schrotter, P.

2007-06-01

243

Silicon-Germanium Fast Packet Switch Developed for Communications Satellites  

NASA Technical Reports Server (NTRS)

Emerging multimedia applications and future satellite systems will require high-speed switching networks to accommodate high data-rate traffic among thousands of potential users. This will require advanced switching devices to enable communication between satellites. The NASA Lewis Research Center has been working closely with industry to develop a state-of-the-art fast packet switch (FPS) to fulfill this requirement. Recently, the Satellite Industry Task Force identified the need for high-capacity onboard processing switching components as one of the "grand challenges" for the satellite industry in the 21st century. In response to this challenge, future generations of onboard processing satellites will require low power and low mass components to enable transmission of services in the 100 gigabit (1011 bits) per second (Gbps) range.

Quintana, Jorge A.

1999-01-01

244

Global disaster satellite communications system for disaster assessment and relief coordination  

NASA Technical Reports Server (NTRS)

The global communication requirements for disaster assistance and examines operationally feasible satellite system concepts and the associated system parameters are analyzed. Some potential problems associated with the current method of providing disaster assistance and a scenario for disaster assistance relying on satellite communications are described. Historical statistics are used with the scenario to assess service requirements. Both present and planned commercially available systems are considered. The associated global disaster communication yearly service costs are estimated.

Leroy, B. E.

1979-01-01

245

Engineers checkout Early Bird-Communication Satellite  

NASA Technical Reports Server (NTRS)

Engineers Stanley R. Peterson (left) and Ray Bowerman (right), checkout the Early Bird, the world's first communication satellite. NASA launched the satellite built by Hughes Aircraft Corporation on April 6, 1955 at 6:48pm E.S.T. from Complex 17a at Cape Kennedy, Florida. Early Bird was built for the Communications Satellite Corporation and weighed about 85 pounds after being placed in a synchronous orbit of 22,300 miles above the earth. It was positioned over the Atlantic to provide 240 two-way telephone channels or 2-way television between Europe and North America. The outer surface of Early Bird was covered with 6,000 silicon-coated solar cells, which absorbed the sun's rays to provide power to the satellite for its intricate transmitting and receiving equipment.

1984-01-01

246

75 FR 77602 - Allocation and Designation of Spectrum for Fixed-Satellite Services in the 37.5-38.5 GHz, 40.5-41...  

Federal Register 2010, 2011, 2012, 2013, 2014

...FEDERAL COMMUNICATIONS COMMISSION 47 CFR...Spectrum for Fixed-Satellite Services in the 37...Bands AGENCY: Federal Communications Commission. ACTION...SUMMARY: The Federal Communications Commission published...technical rules for satellite systems in the...

2010-12-13

247

Turbo Decoder Development in Regenerative Communications Satellites  

Microsoft Academic Search

For regenerative telecom satellite systems, the turbo decoder has become a basic component of the on-board processing (OBP). This paper presents the algorithm selection choices and the test bench policy during the design process of a communication system critical block such as a turbo decoder compliant with the DVB-RCS standard (digital video broadcast-return channel satellite). The architecture, based on the

B. Lestriez; E. R. Perez

2006-01-01

248

Von Karman Lecture - The rocky road to communication satellites  

NASA Astrophysics Data System (ADS)

The history of communications satellites traced in terms of the confluence of the forces of technology, economics and public policy is discussed. The idea of placing communications satellites in GEO was put forward by a science fiction writer in 1945. Syncom II was launched, with a TWT amplifier, into GEO in 1963. Telstar provided the first live transoceanic broadcasts in 1962, just before Comsat was chartered. Early Bird proved that telephony links through GEO satellites was feasible. The follow-up, Intelsat II, was partially spurred by the Apollo program with its worldwide communications demands. Intelsat began with three spacecraft that formed the foundation for the present system. The Intelsat monopoly on worldwide common carrier links is being challenged by ground-based links and entrepreneurial activities spurred by deregulation. An open-skies policy formulated in the U.S. in the late 1960s has led to the launch of various domestic satellite systems with narrow beam transmissions using C- and Ku-band frequencies. Satellite access costs have fallen because of the capabilities of renting or selling individual transponders. Mobile communications systems may soon be served through a joint U.S.-Canada project. Finally, the WARC 1977 set the ground rules for DBS television service, which is in the process of being implemented, mainly by cable operators.

Wheelon, A. D.

1986-01-01

249

Mobile satellite communications systems: Toward global personal communications  

Microsoft Academic Search

The constraints imposed by the RF environment are reviewed. An overview of present and planned mobile satellite systems is given. Present systems refer to those already in operation, while planned systems refer to those that have authority to offer the services and have either a satellite in orbit or one being built to support the systems. Future directions for mobile

John H. Lodge

1991-01-01

250

Performance of Duplex Communication between a Leo Satellite and Terrestrial Location Using a Geo Constellation  

NASA Technical Reports Server (NTRS)

A network comprised of a terrestrial site, a constellation of three GEO satellites and a LEO satellite is modeled and simulated. Continuous communication between the terrestrial site and the LEO satellite is facilitated by the GEO satellites. The LEO satellite has the orbital characteristics of the International Space Station. Communication in the network is based on TCP/IP over ATM, with the ABR service category providing the QoS, at OC-3 data rate. The OSPF protocol is used for routing. We simulate FTP file transfers, with the terrestrial site serving as the client and the LEO satellite being the server. The performance characteristics are presented.

Robinson, Daryl C.; Konangi, Vijay K.; Wallett, Thomas M.

1998-01-01

251

Satellite mobile data service for Canada  

NASA Technical Reports Server (NTRS)

A commercial mobile satellite system which is to be constructed and operated in Canada is examined. This is done in two phases. First, mobile data services was introduced. Hub equipment and 3000 mobile data terminals were supplied. Over the satellite tests were performed. The mobile data service provides full two way digital messaging automatic vehicle location and fleet management services. The second phase is to construct, launch and make operational the MSAT satellite and associated network control facilities. The implementation is examined of the mobile data service in Canada, including the technical description. Marketing and applications are also examined.

Egan, Glenn R.; Sward, David J.

1990-01-01

252

An Orbiting Standards Platform for communication satellite system RF measurements  

NASA Technical Reports Server (NTRS)

The Orbiting Standards Platform (OSP) is a proposed satellite dedicated to performing RF measurements on space communications systems. It would consist of a quasi-geostationary spacecraft containing an ensemble of calibrated RF sources and field strength meters operating in several microwave bands, and would be capable of accurately and conveniently measuring critical earth station and satellite RF performance parameters, such as EIRP, gain, figure of merit (G/T), crosspolarization, beamwidth, and sidelobe levels. The feasibility and utility of the OSP concept has been under joint study by NASA, NBS, Comsat and NTIA. A survey of potential OSP users was conducted by NTIA as part of this effort. The response to this survey, along with certain trends in satellite communications system design, indicates a growing need for such a measurement service.

Wallace, R. G.; Woodruff, J. J.

1978-01-01

253

Viterbi Decoding for Satellite and Space Communication  

Microsoft Academic Search

Convolutional coding and Viterbi decoding, along with binary phase-shift keyed modulation, is presented as an efficient system for reliable communication on power limited satellite and space channels. Performance results, obtained theoretically and through computer simulation, are given for optimum short constraint length codes for a range of code constraint lengths and code rates. System efficiency is compared for hard receiver

J. Heller; I. Jacobs

1971-01-01

254

Distributed Source Coding for Satellite Communications  

Microsoft Academic Search

Inspired by mobile satellite communications systems, we consider a source coding system which consists of multiple sources, multiple encoders, and multiple decoders. Each encoder has access to a certain subset of the sources, each decoder has access to certain subset of the encoders, and each decoder reconstructs a certain subset of the sources almost perfectly. The connectivity between the sources

Raymond W. Yeung; Zhen Zhang

1999-01-01

255

Multibeam active phased arrays for communications satellites  

Microsoft Academic Search

It is well known that an active phased array (APA) payload has the potential to overcome the flexibility limitations associated with conventional communications satellites. This article discusses the benefits and design drivers associated with APAs and features a deployed APA antenna architecture for multiple-beam applications that is modular in construction and programmable in performance. This architecture applies to both receive

A. Jacomb-Hood; E. Lier

2000-01-01

256

Geostationary communications satellite orbit utilization strategies for the 1980s  

NASA Astrophysics Data System (ADS)

Orbital congestion became apparent when the number of applications filed with the Federal Communication Commission (FCC) for 6/4 GHz orbital slots exceeded the number of slots available. In order to overcome this congestion, approaches must be studied for increasing the capacity of the geostationary orbit. In connection with an identification of the factors which affect geostationary orbit capacity, three types of capacity are introduced, including site capacity, service area capacity, and total capacity of the geostationary orbit. Attention is given to approaches for increasing the number of satellites in the geostationary orbit, the phased introduction of new technology, increased interference allocations from other satellites, methods for increasing the spectral efficiency by channel equipment design, the possibility to increase the spectral efficiency by antenna design and frequency reuse, procedures for increasing the available bandwidth, and the development of techniques for optimizing the placement of satellites serving different service areas.

Hedinger, R. A.

257

Characteristics of a future aeronautical satellite communications system  

NASA Technical Reports Server (NTRS)

A possible operational system scenario for providing satellite communications services to the future aviation community was analyzed. The system concept relies on a Ka-band (20/30 GHz) satellite that utilizes multibeam antenna (MBA) technology. The aircraft terminal uses an extremely small aperture antenna as a result of using this higher spectrum at Ka-band. The satellite functions as a relay between the aircraft and the ground stations. The ground stations function as interfaces to the existing terrestrial networks such as the Public Service Telephone Network (PSTN). Various system tradeoffs are first examined to ensure optimized system parameters. High level performance specifications and design approaches are generated for the space, ground, and aeronautical elements in the system. Both technical and economical issues affecting the feasibility of the studied concept are addressed with the 1995 timeframe in mind.

Sohn, Philip Y.; Stern, Alan; Schmidt, Fred

1991-01-01

258

Innovative networking concepts tested on the advanced communications technology satellite  

NASA Astrophysics Data System (ADS)

This paper describes a program of experiments conducted by the CSHCN using ACTS. This program of three experiments commenced in 1992 and utilized the ACTS T1-VSAT terminal. The experiments were motivated by the commercial driver of low-cost receive-only satellite terminals that can operate in a hybrid network environment. The first experiment tested highly adaptive methods of satellite bandwidth allocation in an integrated voice-data service environment. The second involved comparison of FEC and ARQ methods of error control for satellite communcation with emphasis on the advantage that a hybrid architecture provides, especially in the case of multicasts. Finally, the third experiment demonstrated hybrid access to databases through the use of Mosaic and compared the performance X.25 and frame relay communication protocols for interconnecting LANs via satellite. The preparation and conduct of these experiments involved sixteen people from the University of Maryland, the University of Colorado, and COMSAT Laboratories.

Friedman, Daniel; Gupta, Sonjai; Zhang, Chuanguo; Ephremides, Anthony

1995-01-01

259

Designing Satellite Communication Networks by Zero-One Quadratic Programming  

E-print Network

In satellite communications networks, distinctive facilities called homing stations perform special transmission functions. Local demand nodes clustered around each homing station communicate with each other via a local ...

Helme, Marcia P.

260

Method for scrambling satellite communications  

NASA Technical Reports Server (NTRS)

A secure communications system multiplexes segments of the information signal for keyed encoding and modulation onto a plurality of different carrier frequencies and/or polarizations, and transmits the encoded carriers to multi-channel signal summing receivers that decode the segments from all channels, to reassemble the information signal for use by authorized stations with a key. The use of the multi-channel link and the summing receiver allows the greatest number of different coding algorithms for accommodating the greatest number of discrete secure channels.

Brockman, Milton H. (Inventor)

1992-01-01

261

Causal relationships between solar proton events and single event upsets for communication satellites  

E-print Network

In this work, we analyze a historical archive of single event upsets (SEUs) maintained by Inmarsat, one of the world's leading providers of global mobile satellite communications services. Inmarsat has operated its ...

Lohmeyer, Whitney Quinne

262

Satellite communications systems move into the twenty-first century  

Microsoft Academic Search

This paper discusses the evolution of communication satellite systems and communications satellite technology from the 1960's\\u000a to the 1990's. The paper identifies the key attributes of satellite communications that has driven this evolution and now\\u000a drives the future directions such systems will take. The paper then discusses the future direction of communication satellite\\u000a systems including DBS, MSS, FSS and hybrid

Leonard S. Golding

1998-01-01

263

Forecast of space shuttle flight requirements for launch of commercial communications satellites  

NASA Technical Reports Server (NTRS)

The number of communication satellites required over the next 25 years to support domestic and regional communication systems for telephony, telegraphy and other low speed data; video teleconferencing, new data services, direct TV broadcasting; INTELSAT; and maritime and aeronautical services was estimated to determine the number of space shuttle flights necessary for orbital launching.

1977-01-01

264

Autosophy: an alternative vision for satellite communication, compression, and archiving  

NASA Astrophysics Data System (ADS)

Satellite communication and archiving systems are now designed according to an outdated Shannon information theory where all data is transmitted in meaningless bit streams. Video bit rates, for example, are determined by screen size, color resolution, and scanning rates. The video "content" is irrelevant so that totally random images require the same bit rates as blank images. An alternative system design, based on the newer Autosophy information theory, is now evolving, which transmits data "contend" or "meaning" in a universally compatible 64bit format. This would allow mixing all multimedia transmissions in the Internet's packet stream. The new systems design uses self-assembling data structures, which grow like data crystals or data trees in electronic memories, for both communication and archiving. The advantages for satellite communication and archiving may include: very high lossless image and video compression, unbreakable encryption, resistance to transmission errors, universally compatible data formats, self-organizing error-proof mass memories, immunity to the Internet's Quality of Service problems, and error-proof secure communication protocols. Legacy data transmission formats can be converted by simple software patches or integrated chipsets to be forwarded through any media - satellites, radio, Internet, cable - without needing to be reformatted. This may result in orders of magnitude improvements for all communication and archiving systems.

Holtz, Klaus; Holtz, Eric; Kalienky, Diana

2006-08-01

265

Plan of advanced satellite communication experiments using ETS-6  

NASA Technical Reports Server (NTRS)

In 1992, an Engineering Test Satellite 6 is scheduled to be launched by an H-2 rocket. The missions of ETS-6 are to establish basic technologies of inter-satellite communications using S-band, millimeter waves and optical beams and of fixed and mobile satellite communications using multibeam antenna on board the satellite. A plan of the experiments is introduced.

Ikegami, Tetsushi

1989-01-01

266

ANALYSIS OF HANDOVER CHARACTERISTICS IN SHADOWED LEO SATELLITE COMMUNICATION NETWORKS  

E-print Network

ANALYSIS OF HANDOVER CHARACTERISTICS IN SHADOWED LEO SATELLITE COMMUNICATION NETWORKSÂŁ YOUNG HOON In the near future low earth orbit (LEO) satellite communication networks will partially substitute for fixed communication networks more than one satellite need to be simultaneously visible in order to hand over a call

Sung, Dan Keun

267

Satellite Communications David Hart, dhart@cis.ohio-state.edu  

E-print Network

Satellite Communications David Hart, dhart@cis.ohio-state.edu This paper is intended to give an overview of that methods of and uses for satellite communications, in addition to presenting recent trends Page Table of Contents Introductionq Basic Elementsq Various Uses of Satellite Communications

Jain, Raj

268

WDM Polymer Substrate Mode Photonic Interconnects for Satellite Communications  

E-print Network

WDM Polymer Substrate Mode Photonic Interconnects for Satellite Communications Jian Liu Polar is an enabling technology for future satellite communications to increase capacity ofbandwidth and network-3]. Compared with RF satellite communications, they use much smaller antenna aperture size and consume less

Chen, Ray

269

An optimization model of communications satellite planning  

Microsoft Academic Search

A mathematical planning model is developed to help make cost effective decisions on key physical and operational parameters, for a satellite intended to provide customer premises services. The major characteristics of the model are: (1) interactions and tradeoffs among technical variables are formally captured; (2) values for capacity and operational parameters are obtained through optimization; (3) effects of physical and

Amitava Dutta; Dasaratha V. Rama

1992-01-01

270

Propulsion requirements for communications satellites.  

NASA Technical Reports Server (NTRS)

The concept of characteristics thrust is introduced herein as a means of classifying propulsion system tasks related particularly to geosynchronous communications spacecraft. Approximate analytical models are developed to permit estimation of characteristic thrust for injection error corrections, orbit angle re-location, north-south station keeping, east-west station keeping, spin axis precession control, attitude rate damping, and orbit raising applications. Performance assessment factors are then outlined in terms of characteristic power, characteristic weight, and characteristic volume envelope, which are related to the characteristic thrust. Finally, selected performance curves are shown for power as a function of spacecraft weight, including the influence of duty cycle on north-south station keeping, a 90 degree orbit angle re-location in 14 days, and finally comparison of orbit raising tasks from low and intermediate orbits to a final geosynchronous station. Power requirements range from less than 75 watts for north-south station keeping on small payloads up to greater than 15 KW for a 180 day orbit raising mission including a 28.5 degree plane change.

Isley, W. C.; Duck, K. I.

1972-01-01

271

Feasibility of NASA TT&C via Commercial Satellite Services  

NASA Technical Reports Server (NTRS)

This report presents the results of a study to identify impact and driving requirements by implementing commercial satellite communications service into traditional National Aeronautics and Space Administration (NASA) space-ground communications. The NASA communication system is used to relay spacecraft and instrument commands, telemetry and science data. NASA's goal is to lower the cost of operation and increase the flexibility of spacecraft operations. Use of a commercial network offers the opportunity to contact a spacecraft on a nearly "on-demand" basis with ordinary phone calls to enable real time interaction with science events.

Mitchell, Carl W.; Weiss, Roland

1997-01-01

272

Traffic model for advanced satellite designs and experiments for ISDN services  

NASA Technical Reports Server (NTRS)

The data base structure and fields for categorizing and storing Integrated Services Digital Network (ISDN) user characteristics is outlined. This traffic model data base will be used to exercise models of the ISDN Advanced Communication Satellite to determine design parameters and performance for the NASA Satellite Communications Applications Research (SCAR) Program.

Pepin, Gerard R.; Hager, E. Paul

1991-01-01

273

An Earth Orbiting Satellite Service and Repair Facility  

NASA Technical Reports Server (NTRS)

A conceptual design was produced for the Geosynchronous Satellite Servicing Platform (GSSP), an orbital facility capable of repairing and servicing satellites in geosynchronous orbit. The GSSP is a man-tended platform, which consists of a habitation module, operations module, service bay and truss assembly. This design review includes an analysis of life support systems, thermal and power requirements, robotic and automated systems, control methods and navigation, and communications systems. The GSSP will utilize existing technology available at the time of construction, focusing mainly on modifying and integrating existing systems. The entire facility, along with two satellite retrieval vehicles (SRV), will be placed in geosynchronous orbit by the Advanced Launch System. The SRV will be used to ferry satellites to and from the GSSP. Technicians will be transferred from Earth to the GSSP and back in an Apollo-derived Crew Transfer Capsule (CTC). These missions will use advanced telerobotic equipment to inspect and service satellites. Four of these missions are tentatively scheduled per year. At this rate, the GSSP will service over 650 satelites during the projected 25 year lifespan.

Berndt, Andrew; Cardoza, Mike; Chen, John; Daley, Gunter; Frizzell, Andy; Linton, Richard; Rast, Wayne

1989-01-01

274

Hispasat 1: A breakthrough in communications satellites  

NASA Astrophysics Data System (ADS)

Principal features and background for the first generation of Hispasat space communications system approved in January 1989 by the Spanish government are presented. The development started in August 1989 and comprises two satellites and a Ground Control System (GCS). Details of the operational plan and spacecraft characteristics are given. The platform payload and main repeater equipment are described. The spacecraft operational aspects, mass budget, power budget, launcher, lifetime, development and procurement are considered.

Garreau, Michel

1991-10-01

275

Intersatellite link application to commercial communications satellites  

NASA Technical Reports Server (NTRS)

The fundamental characteristics of intersatellite link (ISL) systems, and their application to domestic, regional, and global satellite communications, are described. The quantitative advantages of using ISLs to improve orbit utilization, spectrum occupancy, transmission delay (compared to multi-hop links), coverage, and connectivity, and to reduce the number of earth station antennas, are also presented. Cost-effectiveness and other systems benefits of using ISLs are identified, and the technical and systems planning aspects of ISL systems implementation are addressed.

Lee, Young S.; Atia, Ali E.; Ponchak, Denise S.

1988-01-01

276

Solid-state amplifiers for satellite communications  

Microsoft Academic Search

At frequencies greater than 20 GHz, satellite communications transmitters require only moderate power outputs due to higher-gain antennas. Broadband helix TWT capabilities can be increased to 80 W at 44 GHz by using diamond helix supports; such a tube is being developed. IMPATT diodes are becoming the leading contenders for medium power amplification. Silicon, GaAs and InP devices are competing

D. Masse; R. Harper

1982-01-01

277

United States societal experiments via the Communications Technology Satellite  

NASA Technical Reports Server (NTRS)

After a brief description of the Communication Technology Satellite and its U.S. coverage, the U.S. societal experiments via the CTS are discussed. These include education (college curriculum sharing, and project interchange), health care (biomedical communications, health communications, and communication support for decentralized education), and community and special experiments (satellite library information network, and transportable earth terminal).

Donoughe, P. L.

1976-01-01

278

Concept for advanced satellite communications and required technologies  

NASA Technical Reports Server (NTRS)

The advanced communications technology satellite (ACTS) program of NASA is aimed at the development of high risk technologies that will enable exploiting higher frequency bands and techniques for improving frequency reuse. The technologies under development include multiple beam spacecraft antennas, on-board switching and processing, RF devices and components and advanced earth stations. The program focus is on the Ka-band (30/20 GHz) as the implementing frequency since it has five times the bandwidth of either the C- or Ku-bands. However, the technology being developed is applicable to other frequency bands as well and will support a wide range of future communications systems required by NASA, other Government agencies and the commercial sector. An overview is presented of an operational 30/20 GHz satellite system that may evolve. How the system addresses service requirements is discussed, and the technology required and being developed is considered. Previously announced in STAR as N83-11210

Ramler, J. R.; Salzman, J. A.

1982-01-01

279

Concept for advanced satellite communications and required technologies  

NASA Technical Reports Server (NTRS)

The advanced communications technology satellite (ACTS) program of NASA is aimed at the development of high risk technologies that will enable exploiting higher frequency bands and techniques for improving frequency reuse. The technologies under development include multiple beam spacecraft antennas, on-board switching and processing, RF devices and components and advanced Earth stations. The program focus is on the Ka-band (30/20 GHz) as the implementing frequency since it has five times the bandwidth of either the C- or Ku-bands. However, the technology being developed is applicable to other frequency bands as well and will support a wide range of future communications systems required by NASA, other Government agencies and the commercial sector. An overview is presented of an operational 30/20 GHz satellite system that may evolve. How the system addresses service requirements is discussed, and the technology required and being developed is considered.

Ramler, J. R.; Salzman, J. A.

1982-01-01

280

48 CFR 252.225-7049 - Prohibition on Acquisition of Commercial Satellite Services From Certain Foreign Entities...  

Code of Federal Regulations, 2014 CFR

...subdivision, agency, or instrumentality thereof. Satellite services means communications capabilities that utilize an on-orbit satellite for transmitting the signal from one location to another. State sponsor of terrorism means a country...

2014-10-01

281

Network design consideration of a satellite-based mobile communications system  

NASA Technical Reports Server (NTRS)

Technical considerations for the Mobile Satellite Experiment (MSAT-X), the ground segment testbed for the low-cost spectral efficient satellite-based mobile communications technologies being developed for the 1990's, are discussed. The Network Management Center contains a flexible resource sharing algorithm, the Demand Assigned Multiple Access scheme, which partitions the satellite transponder bandwidth among voice, data, and request channels. Satellite use of multiple UHF beams permits frequency reuse. The backhaul communications and the Telemetry, Tracking and Control traffic are provided through a single full-coverage SHF beam. Mobile Terminals communicate with the satellite using UHF. All communications including SHF-SHF between Base Stations and/or Gateways, are routed through the satellite. Because MSAT-X is an experimental network, higher level network protocols (which are service-specific) will be developed only to test the operation of the lowest three levels, the physical, data link, and network layers.

Yan, T.-Y.

1986-01-01

282

The principle of the positioning system based on communication satellites  

Microsoft Academic Search

It is a long dream to realize the communication and navigation functionality in a satellite system in the world. This paper\\u000a introduces how to establish the system, a positioning system based on communication satellites called Chinese Area Positioning\\u000a System (CAPS). Instead of the typical navigation satellites, the communication satellites are configured firstly to transfer\\u000a navigation signals from ground stations, and

Guoxiang Ai; Huli Shi; Haitao Wu; Zhigang Li; Ji Guo

2009-01-01

283

Annual Survey of Communication Services  

NSDL National Science Digital Library

The Census Bureau has released findings for selected United States communications industry groups from 1995 to 1996. Telephone communication revenues showed an increase of 10 percent while radio and television broadcasting services increased 9 percent. Cable and other pay television services grew the most in 1996 with total revenues of $38 Billion at an increase of 14 percent. Overall, the industry boomed in 1996 with revenues of more than $322 billion.

284

In-Space Internet-Based Communications for Space Science Platforms Using Commercial Satellite Networks  

NASA Technical Reports Server (NTRS)

The continuing technological advances in satellite communications and global networking have resulted in commercial systems that now can potentially provide capabilities for communications with space-based science platforms. This reduces the need for expensive government owned communications infrastructures to support space science missions while simultaneously making available better service to the end users. An interactive, high data rate Internet type connection through commercial space communications networks would enable authorized researchers anywhere to control space-based experiments in near real time and obtain experimental results immediately. A space based communications network architecture consisting of satellite constellations connecting orbiting space science platforms to ground users can be developed to provide this service. The unresolved technical issues presented by this scenario are the subject of research at NASA's Glenn Research Center in Cleveland, Ohio. Assessment of network architectures, identification of required new or improved technologies, and investigation of data communications protocols are being performed through testbed and satellite experiments and laboratory simulations.

Kerczewski, Robert J.; Bhasin, Kul B.; Fabian, Theodore P.; Griner, James H.; Kachmar, Brian A.; Richard, Alan M.

1999-01-01

285

Discussion on the progress and future of satellite communication (Japan)  

NASA Technical Reports Server (NTRS)

The current status of communications satellite development in Japan is presented. It is shown that beginning with research on satellite communucations in the late 1950's, progress was made in the areas of communications, remote sensing, and technology experimentation. The current status of communication satellites is presented, stressing development in the areas of CFRP construction elements, the use of LSI and MIC circuits, advanced multibeam antenna systems, Ku and Ka band transmission systems, and the shift to small-scale earth stations. Methods for reducing costs and increasing transmission efficiency are shown. The technical specifications of all satellite projects currently under development are given. Users of Japanese communications satellite are presented.

Ogata, M.; Mizusawa, H.; Irie, K.

1985-01-01

286

Project Universe - Local area networks and satellite communications  

Microsoft Academic Search

A high-speed digital communications system is discussed in which a satellite is used to link a number of local area networks which interconnect a variety of computer facilities. The advantages of satellite communications compared with terrestrial links are described, together with a historical survey of the use of the Orbital Test Satellite (OTS) for data experiments. A description of Project

B. R. Ackroyd

1983-01-01

287

A New Era Begins: Satellite Communications and Development.  

ERIC Educational Resources Information Center

This overview of changes in the field of telecommunications development produced by satellite communications over the last 15 years focuses on applications of satellite systems for educational and health purposes in developing countries. Satellite communications development from 1974 to 1986 is identified as the first stage of telecommunications…

Pelton, Joseph N.

288

Land vehicle antennas for satellite mobile communications  

NASA Technical Reports Server (NTRS)

Antenna designs applicable to future satellite mobile vehicle communications are examined. Microstrip disk, quadrifilar helix, cylindrical microstrip, and inverted V and U crossed-dipole low gain antennas (3-5 dBic) that provide omnidirectional coverage are described. Diagrams of medium gain antenna (9-12 dBic) concepts are presented; the antennas are classified into three types: (1) electronically steered with digital phase shifters; (2) electronically switched with switchable power divider/combiner; and (3) mechanically steered with motor. The operating characteristics of a conformal antenna with electronic beam steering and a nonconformal design with mechanical steering are evaluated with respect to isolation levels in a multiple satellite system. Vehicle antenna pointing systems and antenna system costs are investigated.

Haddad, H. A.; Paschen, D.; Pieper, B. V.

1985-01-01

289

Presentations of the Ninth Advanced Communications Technology Satellite Propagation Studies Workshop (APSW IX)  

NASA Technical Reports Server (NTRS)

The Advanced Communications Technology Satellite Propagation Studies Workshop (APSW) is convened each year to present the results of the ACTS Propagation Campaign. Representatives from the satellite communications (satcom) industry, academia, and government are invited to APSW for discussions and exchange of information. The ACTS Propagation campaign is completing three years of Ka-Band data collection at seven sites in North America. Through this effort, NASA is making a major contribution to growth of satcom services by providing timely propagation data and models for predicting the performance of Ka-Band satellite communications systems.

Golshan, Nasser (Editor)

1997-01-01

290

Spread spectrum synchronization for a LEO personal communications satellite system  

Microsoft Academic Search

This paper investigates required signal structure and receiver code synchronization techniques for satellite based CDMA personal communications systems. A signal structure is proposed in which different CDMA codes are used to differentiate each satellite (as in the GPS system) and different phases of one code (as in the IS-95 standard) to differentiate spot beams on one satellite. Due to satellite

D. E. Dodds; M. Moher

1995-01-01

291

Satellite Communications with NRAO Green Bank Antennas  

NASA Astrophysics Data System (ADS)

The National Radio Astronomy Observatory's Green Bank facility has several medium and large antennas that are available for satellite communications. The 100 meter Robert C. Byrd Green Bank Telescope (GBT), the largest and most sensitive antenna on site, is capable of receiving signals at frequencies as high as 86 GHz. In addition to the GBT are the fully operational 43 meter, 20 meter, and 13.7 meter antennas, and three mothballed 26 meter antennas. A transmitter could be fitted to any of these antennas for spacecraft uplinks. We discuss the characteristics of these antennas and possible operational models for future planetary science mission support.

Ford, John M.; Ford, H. Alyson; Watts, Galen

2014-11-01

292

47 CFR 27.1136 - Protection of mobile satellite services in the 2000-2020 MHz and 2180-2200 MHz bands.  

Code of Federal Regulations, 2014 CFR

... false Protection of mobile satellite services in the 2000-2020 MHz...1136 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON...27.1136 Protection of mobile satellite services in the 2000-2020...

2014-10-01

293

Use of Satellite Natural Vibrations to Improve Performance of Free-Space Satellite Laser Communication  

Microsoft Academic Search

In some of the future laser communication satellites, it is plausible to assume that tracking and communication receivers will use the same detector array. The reason for dual use of the detector is to design simpler and less expensive satellites. Satellites vibrate continually because of their subsystems and environmental sources. The vibrations cause nonuniform spreading of the received energy on

Shlomi Arnon

1998-01-01

294

Ka-band aeronautical satellite communications experiments using COMETS  

Microsoft Academic Search

This paper describes the results of evaluation tests of an aeronautical satellite communications experiments system in the Ka-band using Japan's communications and broadcasting engineering test satellite (COMETS). An active phased-array antenna with an open-loop satellite tracking capability operating in the Ka-band was installed just behind the passenger window of an airplane to receive a satellite signal. The propagation measurements showed

Amane Miura; Shinichi Yamamoto; Huan-Bang Li; Masato Tanaka; Hiromitsu Wakana

2002-01-01

295

Domestic satellite communication system to be established in China  

NASA Astrophysics Data System (ADS)

The establishment of a domestic satellite communication system for China is discussed. To experiment, China built miniaturized ground stations and used the idle transponders of two INTELSAT satellites. The experiment was divided into three phases: verification and test of ground facilities; test of channel operations; and functional test of the Chinese built ground facilities. From a technical and economic point of view, developing China's domestic satellite communication system by leasing foreign satellites and building China's own ground stations is both efficient and effective.

Ruhou, Z.; Yucheng, B.

1984-01-01

296

Two-way time transfer via communication satellites  

Microsoft Academic Search

The history of two-way satellite time transfer is provided and developments in satellite communications technology conducive to this time transfer technique are briefly reviewed. The difference between one-way and two-way satellite time transfer is explained, and the advantages and disadvantages of the two-way method are pointed out. The theory of the two-way technique using geostationary communication satellites is presented showing

Dieter Kirchner

1991-01-01

297

Communications satellite systems operations with the space station. Volume 3: Supplementary technical report  

NASA Technical Reports Server (NTRS)

The NASA space station has the potential to provide significant economic benefits to commercial communications satellite operators. The initial reports qunatified the benefits of space-based activities and assessed the impacts on the satellite design and the space station. Results are given for the following additional tasks: quantify the value of satellite retrievability operations and define its operational aspects; evaluate the use of expendable launch vehicles for transportation of satellites from the Earth to the space station; and quantify the economic value of modular satellites that are assembled and serviced in space.

Price, K. M.; Russell, P.; Weyandt, C.

1988-01-01

298

HR SERVICES COMMUNICATION SESSION  

E-print Network

;Completed Projects 2013 · Data Cleansing ­ ­ New Processes Implementation ­ Audit Reports · Core Upgrade Level Agreement · Recruitment KPIs · HRIS KPIs #12;HR Services Projects ­ 2013 DMS Core Data Cleansing

299

Optimal Scheduling for Servicing Multiple Satellites in a Circular Constellation  

E-print Network

Optimal Scheduling for Servicing Multiple Satellites in a Circular Constellation Haijun Shen the scheduling of servicing multiple satellites in a circular orbit. Specifically, one servicing spacecraft (SSc) is considered to be initially on the circular orbit of the satellites to be serviced. The SSc then rendezvous

Tsiotras, Panagiotis

300

On-board processing concepts for future satellite communications systems  

NASA Technical Reports Server (NTRS)

The initial definition of on-board processing for an advanced satellite communications system to service domestic markets in the 1990's is discussed. An exemplar system with both RF on-board switching and demodulation/remodulation baseband processing is used to identify important issues related to system implementation, cost, and technology development. Analyses of spectrum-efficient modulation, coding, and system control techniques are summarized. Implementations for an RF switch and baseband processor are described. Among the major conclusions listed is the need for high gain satellites capable of handling tens of simultaneous beams for the efficient reuse of the 2.5 GHz 30/20 frequency band. Several scanning beams are recommended in addition to the fixed beams. Low power solid state 20 GHz GaAs FET power amplifiers in the 5W range and a general purpose digital baseband processor with gigahertz logic speeds and megabits of memory are also recommended.

Brandon, W. T. (editor); White, B. E. (editor)

1980-01-01

301

NASA to launch second business communications satellite  

NASA Astrophysics Data System (ADS)

The two stage Delta 3910 launch vehicle was chosen to place the second small business satellite (SBS-B) into a transfer orbit with an apogee of 36,619 kilometers and a perigee of 167 km, at an inclination of 27.7 degrees to Earth's equator. The firing and separation sequence and the inertial guidance system are described as well as the payload assist module. Facilities and services for tracking and control by NASA, COMSAT, Intelsat, and SBS are outlined and prelaunch operations are summarized.

1981-08-01

302

Engineering calculations for communications satellite systems planning  

NASA Technical Reports Server (NTRS)

Observed solution times were analyzed for the extended gradient and cyclic coordinate search procedures. The times used in the analysis come from computer runs made during a previously-reported experiment conducted to assess the quality of the solutions to a BSS synthesis problem found by the two search methods. The results of a second experiment with a Fixed Satellite Service (FSS) test problem are also presented. Computational results are summarized for mixed integer programming approaches for solving FSS synthesis problems. A promising heuristic algorithm is described. A synthesis model is discussed for orbital arc allotment optimization. Research plans for the near future are also presented.

Reilly, C. H.; Levis, C. A.; Buyukdura, O. M.; Mount-Campbell, C. A.

1986-01-01

303

Communications technology satellite: United States experiments and disaster communications applications  

NASA Technical Reports Server (NTRS)

Ground antennas from 0.6 to 5.0 meters in diameter were used as remote earth terminals by the United States for both wideband (television) and narrowband (voice, data) communication in conjunction with the Canadian Hermes satellite's high power transmitter. Experiments summarized cover teleconferencing and duplex videoconferencing for medical, educational, and civic purposes, as well as the remote interpretation of multilingual broadcasts from the United Nations. The capabilities of the system during real and simulated disasters at airports are assessed. Particular attention is given to miniexperiments for flood control in the Mississippi River basin and in Johnstown, Pennsylvania during the 1977 flood.

Donoughe, P.; Hunczak, H. R.; Gurski, G. S.

1978-01-01

304

Computer Communication Via Satellites--A Queueing Model  

Microsoft Academic Search

The last few years have witnessed the intensive growth of computer communication networks. The need for nationwide and multination computer communication systems brought about the development of packet-switching networks such as the ARPANET. In this paper we examine a model for computer-to-computer communication via a satellite link. In each network, a single node, the satellite communication concentrator (SCC), manages the

BEZALEL GAVISH; ALAN G. KONHEIM

1977-01-01

305

Improving MILSATCOM (Military Satellite Communication) acquisition outcomes: Lease versus buy  

NASA Astrophysics Data System (ADS)

This study was requested by the Director of Space Systems and Command, Control, and Communications, Office of the Deputy Chief of Staff (Research, Development, and Acquisition), Headquarters United States Air Force, to assist in improving the outcomes of military satellite communication (MILSATCOM) programs. In view of rapidly rising costs of military space systems, leasing has been suggested as one way of controlling these costs. The purpose of this study, therefore, was to identify and analyze the central considerations relevant to determining whether to lease or by MILSATCOM services. The results of this report should be of interest to members of MILSATCOM acquisition community and others concerned with making lease versus buy decisions in the public sector. The work was conducted under the MILSATCOM Acquisition Policy project of the Project Air Force Resource Management Program.

Dinneen, P. M.; Quinn, T. H.

1985-01-01

306

An advanced conceptual design study for a mobile satellite communications system  

NASA Astrophysics Data System (ADS)

It is pointed out that a vast portion of the land mass, and a significant portion of the U.S. population in rural and remote areas, are deprived of most of the advanced telecommunication services offered in metropolitan areas. For the last decade, investigations have been conducted regarding the feasibility to provide telecommunication services throughtout the thinly populated areas with the aid of a geostationary satellite. The considered communication services are related to mobile and thin-route radiotelephony, wideband and narrowband data transmissions, and position location services. The mobile satellite (MSAT) communications system studied could provide a truly national and ubiquitous service. Attention is given to satellite antenna design, an MSAT link design analysis, and analysis results.

Salmasi, A. B.

307

Low cost satellite land mobile service for nationwide applications  

NASA Technical Reports Server (NTRS)

A satellite land mobile system using mobile radios in the UHF band, and Ku-band Communications Routing Terminals (earth stations) for a nationwide connection from any mobile location to any fixed or mobile location, and from any fixed location to any mobile location is proposed. The proposed nationwide satellite land mobile service provides: telephone network quality (1 out of 100 blockage) service, complete privacy for all the users, operation similar to the telephone network, alternatives for data services up to 32 Kbps data rates, and a cost effective and practical mobile radio compatible with system sizes ranging from 10,000 to 1,000,000 users. Seven satellite alternatives (ranging from 30 ft diameter dual beam antenna to 210 ft diameter 77 beam antenna) along with mobile radios having a sensitivity figure of merit (G/T) of -15 dB/deg K are considered. Optimized mobile radio user costs are presented as a function of the number of users with the satellite and mobile radio alternatives as system parameters.

Weiss, J. A.

1978-01-01

308

Rain Fade Compensation Alternatives for Ka Band Communication Satellites  

NASA Technical Reports Server (NTRS)

Future satellite communications systems operating in Ka-band frequency band are subject to degradation produced by the troposphere which is much more severe than those found at lower frequency bands. These impairments include signal absorption by rain, clouds and gases, and amplitude scintillation's arising from refractive index irregularities. For example, rain attenuation at 20 GHz is almost three times that at 11 GHz. Although some of these impairments can be overcome by oversizing the ground station antennas and high power amplifiers, the current trend is using small (less than 20 inches apertures), low-cost ground stations (less than $1000) that can be easily deployed at user premises. As a consequence, most Ka-band systems are expected to employ different forms of fade mitigation that can be implemented relatively easily and at modest cost. The rain fade mitigation approaches are defined by three types of Ka-band communications systems - a low service rate (less than 1.5 Mb/s), a moderate service rate (1.5 to 6 Mb/s) system and a high service rate (greater than 43 Mb/s) system. The ACTS VSAT network, which includes an adaptive rain fade technique, is an example of a moderate service rate.

Acosta, Roberto J.

1997-01-01

309

SAW based systems for mobile communications satellites  

NASA Technical Reports Server (NTRS)

Modern mobile communications satellites, such as INMARSAT 3, EMS, and ARTEMIS, use advanced onboard processing to make efficient use of the available L-band spectrum. In all of these cases, high performance surface acoustic wave (SAW) devices are used. SAW filters can provide high selectivity (100-200 kHz transition widths), combined with flat amplitude and linear phase characteristics; their simple construction and radiation hardness also makes them especially suitable for space applications. An overview of the architectures used in the above systems, describing the technologies employed, and the use of bandwidth switchable SAW filtering (BSSF) is given. The tradeoffs to be considered when specifying a SAW based system are analyzed, using both theoretical and experimental data. Empirical rules for estimating SAW filter performance are given. Achievable performance is illustrated using data from the INMARSAT 3 engineering model (EM) processors.

Peach, R. C.; Miller, N.; Lee, M.

1993-01-01

310

Satellite Communications Technology Database. Part 2  

NASA Technical Reports Server (NTRS)

The Satellite Communications Technology Database is a compilation of data on state-of-the-art Ka-band technologies current as of January 2000. Most U.S. organizations have not published much of their Ka-band technology data, and so the great majority of this data is drawn largely from Japanese, European, and Canadian publications and Web sites. The data covers antennas, high power amplifiers, low noise amplifiers, MMIC devices, microwave/IF switch matrices, SAW devices, ASIC devices, power and data storage. The data herein is raw, and is often presented simply as the download of a table or figure from a site, showing specified technical characteristics, with no further explanation.

2001-01-01

311

76 FR 17347 - Aviation Communications  

Federal Register 2010, 2011, 2012, 2013, 2014

...Aeronautical Mobile Satellite (Route) Service...air-to-air communications in Hawaii...Aeronautical Mobile Satellite (Route) Service...air-to-air communications in Hawaii...requiring that mobile satellite systems accord...to AMS(R)S communications in...

2011-03-29

312

Adaptive Beamforming in Mobile, Massively Multiuser Satellite Communications: A System  

E-print Network

Adaptive Beamforming in Mobile, Massively Multiuser Satellite Communications: A System Perspective Xiao Lei, Laura Cottatellucci, Samah A. M. Ghanem Mobile Communications Department, Eurecom, France Email: {xiao.lei; laura.cottatellucci; samah.ghanem}@eurecom.fr Abstract--We consider a Mobile Satellite

Gesbert, David

313

Aluminum variable-conductive heat pipes of the communication satellites  

Microsoft Academic Search

In NPO PM, Zheleznogorsk of Krasnoyarsk region, Russia created the first variable-conductance heat pipes (VCHP) for maintenance of the thermal behavior of the communication satellite of a type ``SMALLSAT'' in whole (four VCHP), and for thermal control of autonomous devices of an attitude control and stabilization system of the communication satellites of a type ``LUCH.'' Due to the presence of

V. Dvirnyi; O. Zagar; Yu. Golovanov; S. Ermilov; K. Smirnov-Vasiliev; V. Khalimanovich; A. Lekanov; G. Panov; G. Ovechkin; A. Kozlov; F. Sinkovsky

1999-01-01

314

Man-Made Moons: Satellite Communications for Schools.  

ERIC Educational Resources Information Center

In an effort to prepare teachers for the coming changes in education caused by the rapidly developing communication satellite technology, this monograph offers a non-technical background to this new development. It begins by explaining the importance of such satellites and offers a layman's guide to the technology of satellite systems. It reviews…

Grayson, Lawrence P.; And Others

315

Beyond ATS-6: Social Uses of Communications Satellites.  

ERIC Educational Resources Information Center

A panel discussion was held to examine the efficacy of the Applications Technology Satellites, powerful communication satellites designed to send quality signals to low-cost ground terminals. The satellites have been used on an experimental basis in rural America, Canada, and India. While the panel generally agreed on the great potential of the…

Cater, Douglass

316

A network architecture for a geostationary communication satellite  

Microsoft Academic Search

An M-VSAT communication system envisioned by NASA would provide low data rate, direct-to-the-user communications services for interactive data, voice, facsimile, and video conferencing. Such a system would enhance current communications services and enable new services

William D. Ivancic; M. J. Shalkhauser; J. A. Quintana

1994-01-01

317

78 FR 61348 - Information Collection Being Reviewed by the Federal Communications Commission Under Delegated...  

Federal Register 2010, 2011, 2012, 2013, 2014

...including communications and remote sensing satellite services...evaluate satellite operators...approval for communications activities...ascertain whether satellite operators...space for communications and...

2013-10-03

318

75 FR 71434 - Notice of Public Information Collection(s) Being Reviewed by the Federal Communications...  

Federal Register 2010, 2011, 2012, 2013, 2014

...including communications and remote sensing satellite services...evaluate satellite operators...approval for communications activities...ascertain whether satellite operators...space for communications and...

2010-11-23

319

Controlling satellite communication system unwanted emissions in congested RF spectrum  

NASA Astrophysics Data System (ADS)

The International Telecommunication Union (ITU), a United Nations (UN) agency, is the agency that, under an international treaty, sets radio spectrum usage regulations among member nations. Within the United States of America (USA), the organization that sets regulations, coordinates an application for use, and provides authorization for federal government/agency use of the radio frequency (RF) spectrum is the National Telecommunications and Information Administration (NTIA). In this regard, the NTIA defines which RF spectrum is available for federal government use in the USA, and how it is to be used. The NTIA is a component of the United States (U.S.) Department of Commerce of the federal government. The significance of ITU regulations is that ITU approval is required for U.S. federal government/agency permission to use the RF spectrum outside of U.S. boundaries. All member nations have signed a treaty to do so. U.S. federal regulations for federal use of the RF spectrum are found in the Manual of Regulations and Procedures for Federal Radio Frequency Management, and extracts of the manual are found in what is known as the Table of Frequency Allocations. Nonfederal government and private sector use of the RF spectrum within the U.S. is regulated by the Federal Communications Commission (FCC). There is a need to control "unwanted emissions" (defined to include out-of-band emissions, which are those immediately adjacent to the necessary and allocated bandwidth, plus spurious emissions) to preclude interference to all other authorized users. This paper discusses the causes, effects, and mitigation of unwanted RF emissions to systems in adjacent spectra. Digital modulations are widely used in today's satellite communications. Commercial communications sector standards are covered for the most part worldwide by Digital Video Broadcast - Satellite (DVB-S) and digital satellite news gathering (DSNG) evolutions and the second generation of DVB-S (DVB-S2) standard, developed by the European Telecommunications Standards Institute (ETSI). In the USA, the Advanced Television Systems Committee (ATSC) has adopted Europe's DVB-S and DVB-S2 standards for satellite digital transmission. With today's digital modulations, RF spectral side lobes can extend out many times the modulating frequency on either side of the carrier at excessive power levels unless filtered. Higher-order digital modulations include quadrature phase shift keying (QPSK), 8 PSK (8-ary phase shift keying), 16 APSK (also called 12-4 APSK (amplitude phase shift keying)), and 16 QAM (quadrature amplitude modulation); they are key for higher spectrum efficiency to enable higher data rate transmissions in limited available bandwidths. Nonlinear high-power amplifiers (HPAs) can regenerate frequency spectral side lobes on input-filtered digital modulations. The paper discusses technologies and techniques for controlling these spectral side lobes, such as the use of square root raised cosine (SRRC) filtering before or during the modulation process, HPA output power back-off (OPBO), and RF filters after the HPA. Spectral mask specifications are a common method of the NTIA and ITU to define spectral occupancy power limits. They are intended to reduce interference among RF spectrum users by limiting excessive radiation at frequencies beyond the regulatory allocated bandwidth.The focus here is on the communication systems of U.S. government satellites used for space research, space operations, Earth exploration satellite services (EESS), meteorological satellite services (METSATS), and other government services. The 8025 to 8400 megahertz (MHz) X band can be used to illustrate the "unwanted emissions" issue. 8025 to 8400 MHz abuts the 8400 to 8450 MHz band allocated by the NTIA and ITU to space research for space-to-Earth transmissions such as receiving very weak Deep Space Network signals. The views and ideas expressed in this paper are those of the authors and do not necessarily reflect those of The Aerospace Corporation or The National Oceanic and Atmosphe

Olsen, Donald; Heymann, Roger

2007-09-01

320

Satellite and terrestrial integrated services digital networks in Japan  

Microsoft Academic Search

Satellite and terrestrial Integrated Services Digital Networks (ISDN) to provide cost effective ISDN services and to enhance installation of ISDN services all over the nation are proposed. The proposed networks are based on the traffic sharing between satellite and terrestrial networks for traffic transmission among telephone offices and provide satellite subscriber lines for ISDN customers in rural areas. The former

Heiichi Yamamoto; Shuzo Kato

1991-01-01

321

22 CFR 123.27 - Special licensing regime for export to U.S. allies of commercial communications satellite...  

Code of Federal Regulations, 2011 CFR

...allies of commercial communications satellite components, systems...allies of commercial communications satellite components, systems...technical data for commercial communications satellites, and who are...

2011-04-01

322

22 CFR 123.27 - Special licensing regime for export to U.S. allies of commercial communications satellite...  

Code of Federal Regulations, 2013 CFR

...allies of commercial communications satellite components, systems...allies of commercial communications satellite components, systems...technical data for commercial communications satellites, and who are...

2013-04-01

323

22 CFR 123.27 - Special licensing regime for export to U.S. allies of commercial communications satellite...  

Code of Federal Regulations, 2014 CFR

...allies of commercial communications satellite components, systems...allies of commercial communications satellite components, systems...technical data for commercial communications satellites, and who are so...

2014-04-01

324

22 CFR 123.27 - Special licensing regime for export to U.S. allies of commercial communications satellite...  

Code of Federal Regulations, 2010 CFR

...allies of commercial communications satellite components, systems...allies of commercial communications satellite components, systems...technical data for commercial communications satellites, and who are...

2010-04-01

325

22 CFR 123.27 - Special licensing regime for export to U.S. allies of commercial communications satellite...  

Code of Federal Regulations, 2012 CFR

...allies of commercial communications satellite components, systems...allies of commercial communications satellite components, systems...technical data for commercial communications satellites, and who are...

2012-04-01

326

Japanese first optical interorbit communications engineering satellite (OICETS)  

NASA Astrophysics Data System (ADS)

The National Space Development Agency of Japan (NASDA) plans to conduct an optical inter-orbit ling experiment in cooperation with the European Space Agency (ESA). ESA will launch the ARTEMIS geostationary satellite equipped with the SILEX optical terminal. NASDA will launch the Optical Inter-orbit Communications Engineering Test Satellite (OICETS) equipped with the LUCE optical inter-orbit communications equipment into low earth orbit. The link experiment will be conducted between these satellites with associated ground equipment in Europe and Japan.

Yamamoto, Akio; Hori, Toshihiro; Shimizu, Takafumi; Nakagawa, Keizo

1994-09-01

327

Advanced Communications Technology Satellite (ACTS): four-year system performance  

Microsoft Academic Search

The Advanced Communications Technology Satellite (ACTS) was conceived at the National Aeronautics and Space Administration (NASA) in the late 1970s as a follow-on program to ATS and CTS to continue NASA's long history of satellite communications projects. The ACTS project set the stage for the C-band satellites that started the industry, and later the ACTS project established the use of

Roberto J. Acosta; Robert Bauer; Richard J. Krawczyk; Richard C. Reinhart; Michael J. Zernic; Frank Gargione

1999-01-01

328

Satellite Communications for Aeronautical Applications: Recent research and Development Results  

NASA Technical Reports Server (NTRS)

Communications systems have always been a critical element in aviation. Until recently, nearly all communications between the ground and aircraft have been based on analog voice technology. But the future of global aviation requires a more sophisticated "information infrastructure" which not only provides more and better communications, but integrates the key information functions (communications, navigation, and surveillance) into a modern, network-based infrastructure. Satellite communications will play an increasing role in providing information infrastructure solutions for aviation. Developing and adapting satellite communications technologies for aviation use is now receiving increased attention as the urgency to develop information infrastructure solutions grows. The NASA Glenn Research Center is actively involved in research and development activities for aeronautical satellite communications, with a key emphasis on air traffic management communications needs. This paper describes the recent results and status of NASA Glenn's research program.

Kerczewski, Robert J.

2001-01-01

329

Multichannel demultiplexer/demodulator technologies for future satellite communication systems  

NASA Technical Reports Server (NTRS)

NASA-Lewis' Space Electronics Div. supports ongoing research in advanced satellite communication architectures, onboard processing, and technology development. Recent studies indicate that meshed VSAT (very small aperture terminal) satellite communication networks using FDMA (frequency division multiple access) uplinks and TDMA (time division multiplexed) downlinks are required to meet future communication needs. One of the critical advancements in such a satellite communication network is the multichannel demultiplexer/demodulator (MCDD). The progress is described which was made in MCDD development using either acousto-optical, optical, or digital technologies.

Ivancic, William D.; Budinger, James M.; Staples, Edward J.; Abramovitz, Irwin; Courtois, Hector A.

1992-01-01

330

Suitability of ANSI standards for quantifying communication satellite system performance  

NASA Technical Reports Server (NTRS)

A study on the application of American National Standards X3.102 and X3.141 to various classes of communication satellite systems from the simple analog bent-pipe to NASA's Advanced Communications Technology Satellite (ACTS) is discussed. These standards are proposed as means for quantifying the end-to-end communication system performance of communication satellite systems. An introductory overview of the two standards are given followed by a review of the characteristics, applications, and advantages of using X3.102 and X3.141 to quantify with a description of the application of these standards to ACTS.

Cass, Robert D.

1988-01-01

331

On-board processing for future satellite communications systems: Satellite-Routed FDMA  

NASA Technical Reports Server (NTRS)

A frequency division multiple access (FDMA) 30/20 GHz satellite communications architecture without on-board baseband processing is investigated. Conceptual system designs are suggested for domestic traffic models totaling 4 Gb/s of customer premises service (CPS) traffic and 6 Gb/s of trunking traffic. Emphasis is given to the CPS portion of the system which includes thousands of earth terminals with digital traffic ranging from a single 64 kb/s voice channel to hundreds of channels of voice, data, and video with an aggregate data rate of 33 Mb/s. A unique regional design concept that effectively smooths the non-uniform traffic distribution and greatly simplifies the satellite design is employed. The satellite antenna system forms thirty-two 0.33 deg beam on both the uplinks and the downlinks in one design. In another design matched to a traffic model with more dispersed users, there are twenty-four 0.33 deg beams and twenty-one 0.7 deg beams. Detailed system design techniques show that a single satellite producing approximately 5 kW of dc power is capable of handling at least 75% of the postulated traffic. A detailed cost model of the ground segment and estimated system costs based on current information from manufacturers are presented.

Berk, G.; Christopher, P. F.; Hoffman, M.; Jean, P. N.; Rotholz, E.; White, B. E.

1981-01-01

332

Direct broadcast satellite service implementation in the United States of America  

NASA Astrophysics Data System (ADS)

The roots of direct-to-home broadcast satellite (DBS) service go back to Clarke (1945), who pointed out the advantages of a world-wide communications system employing three geostationary satellites, one over each major ocean. In 1977, the International Telecommunication Union (ITU) developed a plan for the Broadcasting-Satellite Service (BSS) in the 12-GHz band. BSS planning for the Western Hemisphere (ITU Region 2) was deferred until 1983. In 1980, the first U.S. application was filed to construct an experimental DBS system. The Federal Communications Commission (FCC) adopted rules in 1982 for licensing and operating DBS systems. Attention is given to DBS service choices, aspects of low-power DBS-like service, medium-power DBS-like service, high-power DBS service, types of DBS business, DBS systems standards, and technical standards for high-power DBS.

Clark, J. F.

1985-10-01

333

Emerging commercial opportunities based on combined communication navigation services  

NASA Astrophysics Data System (ADS)

Cost reduction pressure on companies and increasing regulatory and legislative demand together with rapid technological progress in space-based communication and navigation are opening up new and exciting commercial opportunities. In this framework, a novel service for maritime applications is presented using a two-way messaging system and the global navigation satellite system (GNSS). The system implements an end-to-end solution for asset tracking and fleet management, positioning and tracing, messaging and security for all types of sea-going vessels. The service applies a vessel-based terminal hosting a GNSS receiver which transmits the navigation status together with messages to a Service Center with a flexible return-link capability. A hybrid space segment is considered comprising the Inmarsat constellation of geostationary communications satellites augmented by two highly inclined low earth orbit satellites for truly global services. Services will be offered to commercial enterprises such as fishing companies as well as public entities such as National Coast Guards. A detailed market analysis has been performed to assess these markets and to determine their penetration. Commercial viability has been proven for business models purely based on Inmarsat and a hybrid space segment using Inmarsat and dedicated micro-satellites. Both cases represent viable businesses in the range of MEUR 100 p.a. Although tailored to a specific market, the approach can be extended to other commercial opportunities requiring space-based communication-navigation services.

Gill, Eberhard; Fox, Brian M.; Kreisel, Joerg

2006-07-01

334

RAPID COMMUNICATION / COMMUNICATION RAPIDE Results of pop-up satellite tagging of spawning  

E-print Network

RAPID COMMUNICATION / COMMUNICATION RAPIDE Results of pop-up satellite tagging of spawning size bluefin tuna were captured in September and October 1997 and tagged and released with pop-up satellite pistées par satellite qui devaient se libérer de mars à juillet 1998. Dix-sept étiquettes ont bien été

Hawai'i at Manoa, University of

335

47 CFR 25.284 - Emergency Call Center Service.  

Code of Federal Regulations, 2011 CFR

...284 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations § 25...Service. (a) Providers of mobile satellite service to...

2011-10-01

336

47 CFR 25.284 - Emergency Call Center Service.  

Code of Federal Regulations, 2010 CFR

...284 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations § 25...Service. (a) Providers of mobile satellite service to...

2010-10-01

337

47 CFR 25.284 - Emergency Call Center Service.  

Code of Federal Regulations, 2012 CFR

...284 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations § 25...Service. (a) Providers of mobile satellite service to...

2012-10-01

338

78 FR 31576 - Enforcement Proceeding; Certain Two-Way Global Satellite Communication Devices, System and...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Certain Two-Way Global Satellite Communication Devices, System and Components...certain two-way global satellite communication devices, system and components...importation any two-way global satellite communication devices, system,...

2013-05-24

339

What Drives Spacecraft Innovation? A Quantitative Analysis of Communication Satellite History  

E-print Network

1 What Drives Spacecraft Innovation? A Quantitative Analysis of Communication Satellite History of Communication Satellite History by Zoe Szajnfarber Submitted to the Department of Aeronautics tradeoffs associated with adopting this principle in the context of communication satellites

de Weck, Olivier L.

340

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING Int. J. Satell. Commun. Network. 2006; 24:261281  

E-print Network

INTERNATIONAL JOURNAL OF SATELLITE COMMUNICATIONS AND NETWORKING Int. J. Satell. Commun. Network: 10.1002/sat.841 Turbo-coded APSK modulations design for satellite broadband communications Riccardo phase shift keying (APSK) modulation with application to satellite broadband communications. APSK

341

Distributed Satellite Communication System Design: First-Order Interactions between System and Network  

E-print Network

Distributed Satellite Communication System Design: First-Order Interactions between System to bankruptcy. The upfront capital required to implement a satellite communications system is staggering and performance of a system. Traditionally, the first step toward designing satellite communication systems

de Weck, Olivier L.

342

IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 46, NO. 3, MARCH 1998 309 Doppler Characterization for LEO Satellites  

E-print Network

when communicating through low earth orbit (LEO) satellites. This paper deals with the analytic approximation, satellite visibility. I. INTRODUCTION F OR SATELLITE communications through low earth orbit (LEOIEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 46, NO. 3, MARCH 1998 309 Doppler Characterization

Al-Dhahir, Naofal

343

77 FR 58579 - Certain Two-Way Global Satellite Communication Devices, System and Components Thereof...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Certain Two-Way Global Satellite Communication Devices, System and Components...certain two-way global satellite communication devices, system and components...certain two-way global satellite communication devices, system and...

2012-09-21

344

Mugunghwa: The first Korean domestic satellite for FSS and DBS services  

NASA Astrophysics Data System (ADS)

Mugunghwa is the first generation satellite for the Republic of Korea. It uses the advanced digital technology for direct broadcasting and fixed satellite services in Korea. It will provide basic satellite communications facilities with small low-cost remote stations for rural and remote areas presently having inadequate or no telecommunication facilities. It will also provide high speed data and video distributions for business television and other professional program services such as tele-educational video networks. High quality color television and high definition TV services will also be available anywhere in Korea.

Hwangbo, Han

345

Satellite Packet Communication--Multiple Access Protocols and Performance  

Microsoft Academic Search

Satellite communication systems have traditionally been designed for voice traffic. Multiple access protocols for conflict resolution have typically been channel-oriented with either fixed or demand assignment. Data communications, however, have much more diverse traffic characteristics and transmission requirements than voice communications. We present in this paper an overview of two major categories of packet-oriented multiple access protocols: contention and reservation

S. Lam

1979-01-01

346

Communication technology is integral to most aerospace systems. Communication satel-lites bring us live coverage of events from around the world, deep-space communication  

E-print Network

lacking terrestrial communication infrastructure, satellite-based networks provide the only viable mechanism for vital communication ser- vices. For example, the U.S. military depends on satellites for rapidly deployable, robust, and reliable communications during military operations, and satellites

Peraire, Jaime

347

Satellite servicing mission preliminary cost estimation model  

NASA Technical Reports Server (NTRS)

The cost model presented is a preliminary methodology for determining a rough order-of-magnitude cost for implementing a satellite servicing mission. Mission implementation, in this context, encompassess all activities associated with mission design and planning, including both flight and ground crew training and systems integration (payload processing) of servicing hardward with the Shuttle. A basic assumption made in developing this cost model is that a generic set of servicing hardware was developed and flight tested, is inventoried, and is maintained by NASA. This implies that all hardware physical and functional interfaces are well known and therefore recurring CITE testing is not required. The development of the cost model algorithms and examples of their use are discussed.

1987-01-01

348

The Principle of Navigation Constellation Composed of SIGSO Communication Satellites  

E-print Network

The Chinese Area Positioning System (CAPS), a navigation system based on GEO communication satellites, was developed in 2002 by astronomers at Chinese Academy of Sciences. Extensive positioning experiments of CAPS have been performed since 2005. On the basis of CAPS, this paper studies the principle of navigation constellation composed of Slightly Inclined Geostationary Orbit (SIGSO) communication satellites. SIGSO satellites are derived from end-of-life Geostationary Orbit (GEO) satellites under inclined orbit operation. Considering the abundant frequency resources of SIGSO satellites, multi-frequency observations could be conducted to enhance the precision of pseudorange measurements and ameliorate the positioning performence. The constellation composed of two GEO satellites and four SIGSO satellites with inclination of 5 degrees can provide the most territory of China with 24-hour maximum PDOP less than 42. With synthetic utilization of the truncated precise (TP) code and physical augmentation factor in fo...

Ji, Hai-Fu; Ai, Guo-Xiang; Shi, Hu-Li

2012-01-01

349

Ultra high frequency follow-on communications satellite system  

NASA Astrophysics Data System (ADS)

The existing constellation of UHF communications satellites (LEASAT and FLTSAT) provide key command and control links for mobile forces of the DoD and other government agencies. The UHF Follow-On satellite program will provide for a new generation of communications satellites to replace the existing ones as they reach the end of their life cycle beginning in 1992. Continued coverage is required for both peacetime and crisis environments, and must be maintained indefinitely. An eight-satellite UFO constellation (two per coverage area) will replenish the existing FLTSATCOM constellation.

Hassien, Michael J.

1992-03-01

350

Experimental program and future plans for communications satellite in Japan  

NASA Astrophysics Data System (ADS)

Tests carried out as part of the Engineering Test Satellite Type II (ETS-II) program show that the millimeter wave band is more suitable for satellite than for terrestrial communications. Satellite communications in the 50/40 GHz frequency band are investigated, as are regenerative repeaters, multispot beam antennas, and satellite switching in TDMA and SDMA. It is found that by using extremely small earth stations, more than 20 telephone channels can be transmitted with some margins. Again with small earth stations, one TV channel can be transmitted with rain margins of about 10 dB.

Kattoh, T.; Otsu, Y.; Inomata, H.

1982-09-01

351

Cockpit weather graphics using mobile satellite communications  

NASA Astrophysics Data System (ADS)

Many new companies are pushing state-of-the-art technology to bring a revolution in the cockpits of General Aviation (GA) aircraft. The vision, according to Dr. Bruce Holmes - the Assistant Director for Aeronautics at National Aeronautics and Space Administration's (NASA) Langley Research Center, is to provide such an advanced flight control system that the motor and cognitive skills you use to drive a car would be very similar to the ones you would use to fly an airplane. We at ViGYAN, Inc., are currently developing a system called the Pilot Weather Advisor (PWxA), which would be a part of such an advanced technology flight management system. The PWxA provides graphical depictions of weather information in the cockpit of aircraft in near real-time, through the use of broadcast satellite communications. The purpose of this system is to improve the safety and utility of GA aircraft operations. Considerable effort is being extended for research in the design of graphical weather systems, notably the works of Scanlon and Dash. The concept of providing pilots with graphical depictions of weather conditions, overlaid on geographical and navigational maps, is extremely powerful.

Seth, Shashi

352

A satellite system for land-mobile communications in Europe  

NASA Technical Reports Server (NTRS)

There exists a great unsatisified demand for land mobile communications in Europe, particularly in sectors of business activity such as the road transport industry. This demand could best be satisfied by means of satellite-based private networks providing voice and data communications in a hub configuration. The potential market is estimated to encompass several hundred thousand road vehicles and the transmission capacity required would be several thousand channels. ESA is currently demonstrating the potential of satellite communications for this type of application, using a system called PRODAT. System studies are being performed with the aim of defining the architecture of a regional satellite system for Europe.

Bartholome, P.; Rogard, R.

1988-01-01

353

47 CFR 80.1185 - Supplemental eligibility for mobile-satellite stations.  

Code of Federal Regulations, 2012 CFR

...eligibility for mobile-satellite stations. 80...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...Installations Mobile-Satellite Stations § 80...proposing to furnish satellite communication services on...

2012-10-01

354

47 CFR 80.1185 - Supplemental eligibility for mobile-satellite stations.  

Code of Federal Regulations, 2010 CFR

...eligibility for mobile-satellite stations. 80...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...Installations Mobile-Satellite Stations § 80...proposing to furnish satellite communication services on...

2010-10-01

355

47 CFR 80.1185 - Supplemental eligibility for mobile-satellite stations.  

Code of Federal Regulations, 2013 CFR

...eligibility for mobile-satellite stations. 80...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...Installations Mobile-Satellite Stations § 80...proposing to furnish satellite communication services on...

2013-10-01

356

47 CFR 80.1185 - Supplemental eligibility for mobile-satellite stations.  

Code of Federal Regulations, 2011 CFR

...eligibility for mobile-satellite stations. 80...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...Installations Mobile-Satellite Stations § 80...proposing to furnish satellite communication services on...

2011-10-01

357

Technology programs and related policies - Impacts on communications satellite business ventures  

NASA Technical Reports Server (NTRS)

The DOMSAT II stochastic communication satellite business venture financial planning simulation model is described. The specification of business scenarios and the results of several analyses are presented. In particular, the impacts of NASA on-orbit propulsion and power technology programs are described. The effects of insurance rates and self-insurance and of the use of the Space Shuttle and Ariane transportation systems on a typical fixed satellite service business venture are discussed.

Greenberg, J. S.

1985-01-01

358

Engineering calculations for communications satellite systems planning  

NASA Technical Reports Server (NTRS)

A procedure is described that was used to calculate minimum required satellite separations based on total link carrier to interference requirements. Also summarized are recent results with a switching algorithm for satellite synthesis problems. Analytic solution value bounds for two of the satellite synthesis models studied are described. Preliminary results from an empirical study of alternate mixed integer programming models for satellite synthesis are presented. Research plans for the near future are discussed.

Reilly, Charles H.; Walton, Eric K.; Kohnhorst, Paul

1987-01-01

359

Spacecraft IF switch matrix for wideband service applications in 30/20 GHz communications satellite systems: Proof-of-concept model, executive summary  

NASA Technical Reports Server (NTRS)

The design and development of a unique coupler crossbar 20 x 20 microwave switch matrix are described. The test results of the proof of concept model that meets the requirements for a high speed satellite switched, time division multiple access (SS-TDMA) system are presented.

Ho, P. T.; Coban, E.; Pelose, J.

1983-01-01

360

Design and Implementation of a Lunar Communications Satellite and Server for the 2012 SISO Smackdown  

NASA Technical Reports Server (NTRS)

Last year, the Simulation Interoperability Standards Organization (SISO) inaugurated the now annual High Level Architecture (HLA) Smackdown at the Spring Simulation Interoperability Workshop (SIW). A primary objective of the Smackdown event is to provide college students with hands-on experience in the High Level Architecture (HLA). The University of Alabama in Huntsville (UAHuntsville) fielded teams in 2011 and 2012. Both the 2011 and 2012 smackdown scenarios were a lunar resupply mission. The 2012 UAHuntsville fielded four federates: a communications network Federate called Lunar Communications and Navigation Satellite Service (LCANServ) for sending and receiving messages, a Lunar Satellite Constellation (LCANSat) to put in place radios needed by the communications network for Line-Of-Sight communication calculations, and 3D graphical displays of the orbiting satellites and a 3D visualization of the lunar surface activities. This paper concentrates on the first two federates by describing the functions, algorithms, the modular FOM, experiences, lessons learned and recommendations for future Smackdown events.

Bulgatz, Dennis; Heater, Daniel; O'Neal, Daniel A.; Norris, Bryan; Schricker, Bradley C.

2012-01-01

361

A multi-purpose satellite service at 20/30 GHz - Opportunities and challenges  

NASA Astrophysics Data System (ADS)

The suitability of developing high-frequency bands is evaluated with particular attention given to the use of the 20/30-GHz band for satellite voice, data, and video communications. Crowding in the C- and Ku-band frequencies allocated to fixed-satellite services is examined in the light of continuing growth, and the benefits of establishing general-satellite services (GSSs) are listed. NASA's ACTS program and private GSS systems are delineated and shown to offer high-data-rate fixed-communications antennas and technologies suitable for multiple services. The Norstar satellite is described as an example of a GSS system, and the technical characteristics are given. In spite of technical, operational, and regulatory challenges presented by the development of GSS systems, a GSS allocation can enable the International Telecommunications Union to be proactive in its spectrum/orbit allocations.

Taylor, Leslie

1992-03-01

362

Bandwidth Efficient Turbo Coding For High Speed Mobile Satellite Communications  

Microsoft Academic Search

ABSTRACT This paper describes an application of turbo codes in conjunction with 16QAM in high speed mobile satellite communications The channel characteristics, the architecture of the modem and the performance curves for the selected turbo codes are presented

Mark Rice; Paul Gray; S. Adrian Barbulescu; Wade Farrell

1997-01-01

363

Automated Calibration of Satellite Communication Set Solid-State Amplifiers  

Microsoft Academic Search

Automated test unit for satellite communication amplifiers calibration is fabricated. This system consists of heat-chamber, measuring instruments, control computer, units under test control circuit. Special software for automated measurements is developed

D. S. Ivanov; Yu. V. Doronichev; V. M. Tarasenko

2006-01-01

364

Satellite communication and navigation for mobile users  

NASA Technical Reports Server (NTRS)

Efforts made to utilize space technology for solving communication and navigation problems faced by mobile users in earth orientated situations are outlined. Applications include transoceanic airline communications, reliable long range ship-shore communications, emergency communications in regions with rough terrain, and military operations.

Bernstein, S. L.

1972-01-01

365

The 18/30 GHz fixed communications system service demand assessment. Volume 1: Executive summary  

NASA Technical Reports Server (NTRS)

The total demand for voice, video, and data communications services, and satellite transmission services at the 4/6 GHz, 12/14 GHz, and 18/30 GHz frequencies is discussed. Major study objectives, overall methodology, results, and general observations about a satellite systems market characteristics and trends are summarized.

Gabriszeski, T.; Reiner, P.; Rogers, J.; Terbo, W.

1979-01-01

366

Run-time satellite tele-communications call handling as dynamic constraint satisfaction  

Microsoft Academic Search

The next generation of communications satellites may be designed as a fast packet-switched constellation of spacecraft able to withstand substantial bandwidth capacity fluctuations due to causes ranging from unstable weather phenomena to intentional jamming. Scheduling and servicing call requests in such a dynamic environment requires real-time decisions with regard to allocation of resources including bandwidth, call routing and load balancing.

Christian Plaunt; Ari K. Jonsson; Jeremy Frank

1999-01-01

367

Integrating satellite and terrestrial technologies for emergency communications: the WISECOM project  

Microsoft Academic Search

In this paper, the main concepts of the Wireless Infrastructure over Satellite for Emergency COMmunications project (WISECOM) are presented. These concepts rely upon the idea of a light and rapidly deployable system that can be autonomously used in remote areas where telecommunication networks have broken down to provide access to emergency telecommunication services using a large set of wide-spread telecommunication

Matteo Berioli; Nicolas Courville; Markus Werner

2007-01-01

368

Second INTELSAT IV-A communications satellite set for launch  

NASA Technical Reports Server (NTRS)

The scheduled launching of INTELSAT 4-A is announced. It is a commercial communications satellite to be launched aboard an Atlas/Centaur Launch Vehicle from the Kennedy Space Center, Fla. The satellite has the capability of carrying approximately 6250 two-way telephone conversations.

1976-01-01

369

Analysis of submarine cable and communication satellite systems reliabilities  

Microsoft Academic Search

The performance of AT&T's overseas message telephone circuits for the years 1970-1975 was the basis for ana analysis of the reliability of submarine cables and communication satellite systems. Data presented in 24 tables is devided into three categories: (1) over cable and satellite system outage statistics for each of the six years and the six year average, (2) detailed cable

G. S. Li

1977-01-01

370

Channel-Individual Adaptive Beamforming for Mobile Satellite Communications  

Microsoft Academic Search

A digital frequency-division multiplex demultiplexer for single channel per carrier (SCPC) signals was developed for use in a digital channel-individual beamforming network for an adaptive satellite array antenna for mobile satellite communications. The available ASIC (35000 gate functions in CMOS technology, clock rate up to 30 MHz with low power consumption) permits the separation of FDM signals comprising up to

Thomas Gebauer; Heinz G. Göckler

1995-01-01

371

Advanced technology in satellite communication antennas: Electrical and mechanical design  

Microsoft Academic Search

Antenna technology for earth stations and satellites is discussed. The fundamentals, including common analysis methods, for antenna technology for satellite communication are reviewed. Details of the analysis method for beam waveguide feeds are shown, and electrical and mechanical designs for earth station antennas are examined. Offset dual-reflector antennas and offset reflector antennas with beam waveguide feed are examined, giving comprehensive

Takashi Kitsuregawa

1990-01-01

372

SPICE Testbed: A DTN Testbed for Satellite and Space Communications  

E-print Network

SPICE Testbed: A DTN Testbed for Satellite and Space Communications Ioannis Komnios, Ioannis SPICE testbed, a state-of-the-art Delay Tolerant Networking testbed for satellite and space of underlying and overlying protocols. SPICE testbed is equipped with specialised hardware components

Tsaoussidis, Vassilis

373

Optimal energy allocation and admission control for communications satellites  

Microsoft Academic Search

We address the issue of optimal energy allocation and admission control for communications satellites in earth orbit. Such satellites receive requests for transmission as they orbit the earth, but may not be able to serve them all, due to energy limitations. The objective is to choose which requests to serve so that the expected total reward is maximized. The special

Alvin C. Fu; Eytan Modiano; John N. Tsitsiklis

2003-01-01

374

Optimal Energy Allocation and Admission Control for Communications Satellites  

Microsoft Academic Search

We address the issue of optimal energy allocation and admis- sion control for communications satellites in earth orbit. These satellites receive requests for transmission as they orbit the earth, but may not be able to serve them all, due to energy limitations. The objective is to choose which requests to serve so that the expected total reward is maximized. The

Alvin Fu; Eytan Modiano; John N. Tsitsiklis

2002-01-01

375

Computer-Aided Communication Satellite System Analysis and Optimization.  

ERIC Educational Resources Information Center

Various published computer programs for fixed/broadcast communication satellite system synthesis and optimization are discussed. The rationale for selecting General Dynamics/Convair's Satellite Telecommunication Analysis and Modeling Program (STAMP) in modified form to aid in the system costing and sensitivity analysis work in the Program on…

Stagl, Thomas W.; And Others

376

Ionospheric models for satellite and ground radio communication systems  

Microsoft Academic Search

Several empirical bottomside ionospheric models of electron density distribution with height are briefly reviewed. These include Nisbet's model (1971), the model of Bradley and Dudeney (1973), and the model of Rush and Miller (1974). Bent's global electron density model (1972) is also examined, and its application to VLBI, ground and satellite communications, and satellite orbit determination, is described.

Z. Klos; K. Stasiewicz; I. Stanislawska

1979-01-01

377

Telecommunication service by leased transponders of the regional satellite  

NASA Astrophysics Data System (ADS)

Various telecommunications applications and services that can be provided by regional satellites are discussed. The potential for extending and enhancing Asia's telecommunications infrastructure is huge; and as Asian countries further develop economically, they will require the speed and power of satellites in order to develop their telecom and television broadcasting facilities quickly and economically. Topics discussed include emergence of regional satellite systems; services offered by regional satellites; rural telecommunication; trunk routes; international links; and television broadcasting.

Jordan, Andrew

378

Aeronautical mobile satellite service: Air traffic control applications  

NASA Astrophysics Data System (ADS)

Canada's history both in aviation and in satellite communications development spans several decades. The introduction of aeronautical mobile satellite communications will serve our requirements for airspace management in areas not served by line-of-sight radio and radar facilities. The ensuing improvements in air safety and operating efficiency are eagerly awaited by the aviation community.

Sim, Dave

379

Aeronautical mobile satellite service: Air traffic control applications  

NASA Technical Reports Server (NTRS)

Canada's history both in aviation and in satellite communications development spans several decades. The introduction of aeronautical mobile satellite communications will serve our requirements for airspace management in areas not served by line-of-sight radio and radar facilities. The ensuing improvements in air safety and operating efficiency are eagerly awaited by the aviation community.

Sim, Dave

1990-01-01

380

Continuation of the compendium of applications technology satellite and communications technology satellite user experiments 1967-1977, volume 2. [bibliography  

NASA Technical Reports Server (NTRS)

Approximately 453 reports, papers, and articles catalogued into an information retrieval system, covering communications experiments and demonstrations conducted, utilizing the Communications Technology Satellite and the Applications Technology Satellites 1, 3, 5, and 6 are listed.

Engler, N. A.; Nash, J. F.; Strange, J. D.

1978-01-01

381

47 CFR 101.1013 - Permissible communications services.  

Code of Federal Regulations, 2010 CFR

...false Permissible communications services. 101...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) SAFETY...render any kind of communications service consistent with the Commission's rules and...

2010-10-01

382

Engineering calculations for communications satellite systems planning  

NASA Astrophysics Data System (ADS)

The final phase of a satellite synthesis project is described. Several methods for generating satellite positionings with improved aggregate carrier to interference characteristics were studied. Two general methods for modifying required separation values are presented. Also, two methods for improving aggregate carrier to interference (C/I) performance of given satellite synthesis solutions are presented. A perturbation of the World Administrative Radio Conference (WARC) synthesis is presented.

Walton, E.; Aebker, E.; Mata, F.; Reilly, C.

1991-05-01

383

Engineering calculations for communications satellite systems planning  

NASA Technical Reports Server (NTRS)

The final phase of a satellite synthesis project is described. Several methods for generating satellite positionings with improved aggregate carrier to interference characteristics were studied. Two general methods for modifying required separation values are presented. Also, two methods for improving aggregate carrier to interference (C/I) performance of given satellite synthesis solutions are presented. A perturbation of the World Administrative Radio Conference (WARC) synthesis is presented.

Walton, E.; Aebker, E.; Mata, F.; Reilly, C.

1991-01-01

384

Use of Advanced Solar Cells for Commercial Communication Satellites  

NASA Technical Reports Server (NTRS)

The current generation of communications satellites are located primarily in geosynchronous Earth orbit (GEO). Over the next decade, however, a new generation of communications satellites will be built and launched, designed to provide a world-wide interconnection of portable telephones. For this mission, the satellites must be positioned in lower polar and near-polar orbits. To provide complete coverage, large numbers of satellites will be required. Because the required number of satellites decreases as the orbital altitude is increased, fewer satellites would be required if the orbit chosen were raised from low to intermediate orbit. However, in intermediate orbits, satellites encounter significant radiation due to trapped electrons and protons. Radiation tolerant solar cells may be necessary to make such satellites feasible. We analyze the amount of radiation encountered in low and intermediate polar orbits at altitudes of interest to next-generation communication satellites, calculate the expected degradation for silicon, GaAs, and InP solar cells, and show that the lifetimes can be significantly increased by use of advanced solar cells.

Bailey, Sheila G.; Landis, Geoffrey A.

1995-01-01

385

Integrated text-communication services digital networks  

Microsoft Academic Search

Circuit and packet switched facilities as well as distributed information processing units handling new text communication services are part of future integrated services digital networks. The functional integration of text communicaton procedures with the digital network is discussed. Unified handling of batch and interactive text communications is proposed. The use of standardized protocols at both transport and user service levels

R. Montemurro; F. Villani

1980-01-01

386

Ionospheric effects on C3I satellite communications systems in Greenland  

NASA Astrophysics Data System (ADS)

The effects of polar ionospheric scintillation fading on U.S. military satellite communications systems in Greenland are reviewed. The operational type of satellite communications testing, conducted for the past 10 years to evaluate the feasibility of replacing the traditional HF radio links with satellite communications links is described. Some future plans for the operational use of satellite communications in Greenland are identified.

Johnson, A.; Taagholt, J.

1985-06-01

387

A satellite-based personal communication system for the 21st century  

NASA Technical Reports Server (NTRS)

Interest in personal communications (PCOMM) has been stimulated by recent developments in satellite and terrestrial mobile communications. A personal access satellite system (PASS) concept was developed at the Jet Propulsion Laboratory (JPL) which has many attractive user features, including service diversity and a handheld terminal. Significant technical challenges addressed in formulating the PASS space and ground segments are discussed. PASS system concept and basic design features, high risk enabling technologies, an optimized multiple access scheme, alternative antenna coverage concepts, the use of non-geostationary orbits, user terminal radiation constraints, and user terminal frequency reference are covered.

Sue, Miles K.; Dessouky, Khaled; Levitt, Barry; Rafferty, William

1990-01-01

388

R and D limited partnerships (possible applications in advanced communications satellite technology experiment program)  

NASA Technical Reports Server (NTRS)

Typical R&D limited partnership arrangements, advantages and disadvantages of R&D limited partnership (RDLPs) and antitrust and tax implications are described. A number of typical forms of RDLPs are described that may be applicable for use in stimulating R&D and experimental programs using the advanced communications technology satellite. The ultimate goal is to increase the rate of market penetration of goods and/or services based upon advanced satellite communications technology. The conditions necessary for these RDLP forms to be advantageous are outlined.

1985-01-01

389

Leo Satellite Communication through a LEO Constellation using TCP/IP Over ATM  

NASA Technical Reports Server (NTRS)

The simulated performance characteristics for communication between a terrestrial client and a Low Earth Orbit (LEO) satellite server are presented. The client and server nodes consist of a Transmission Control Protocol /Internet Protocol (TCP/IP) over ATM configuration. The ATM cells from the client or the server are transmitted to a gateway, packaged with some header information and transferred to a commercial LEO satellite constellation. These cells are then routed through the constellation to a gateway on the globe that allows the client/server communication to take place. Unspecified Bit Rate (UBR) is specified as the quality of service (QoS). Various data rates are considered.

Foore, Lawrence R.; Konangi, Vijay K.; Wallett, Thomas M.

1999-01-01

390

Power Control Algorithms for Satellite Communication Systems  

Microsoft Academic Search

Three different ground terminal transmit power control concepts for a Satcom system are examined. The effectiveness of constant satellite power (CSP) sharing among the carriers and adaptive satellite power (ASP) sharing is compared with constant ground terminal transmit power (CTP). It is shown that ASP offers substantial advantages over CSP in combating environmental degradations and that both can increase link

A. Ince; D. Brown; J. Midgley

1976-01-01

391

Coded Modulations for Mobile Satellite Communication Channels  

Microsoft Academic Search

The mobile satellite (MSAT) channel is subject to multipath fading, shadowing, Doppler frequency shift, and adjacent channel interference (ACI). Therefore, transmitted signals face severe amplitude and phase distortions. This dissertation investigates various high performance and low decoding complexity coded modulation schemes for reliable voice and data transmissions over the shadowed mobile satellite channel and the Rayleigh fading channel. The dissertation

Dojun Rhee

1995-01-01

392

COMMUNICATION SATELLITES FOR EDUCATION, SCIENCE AND CULTURE. REPORTS AND PAPERS ON MASS COMMUNICATION, NO. 53.  

ERIC Educational Resources Information Center

THE TECHNOLOGY OF COMMUNICATION SATELLITES IS SUFFICIENTLY ADVANCED THAT CONCERNED AGENCIES, SUCH AS UNESCO, SHOULD BEGIN TO PLAN FOR THEIR USE IN EXCHANGE OF DATA, NEWS TRANSMISSION, CULTURAL EXCHANGE, AND EDUCATION. GROUNDWORK IN TECHNOLOGY, IN THE DESIGN OF A SATELLITE COMMUNICATION SYSTEM, IN VALUE JUDGMENTS, IN AGREEMENTS OF COOPERATION AND…

SCHRAMM, WILBUR

393

President's Task Force on Communications Policy. Domestic Applications of Communication Satellite Technology. Staff Paper Four.  

ERIC Educational Resources Information Center

A staff paper to the President's Task Force on Communications Policy examines the feasibility of a domestic communications satellite system. Although, with expected technological advancement, satellites may play a significant role in domestic transmission and are economically feasible right now, a number of remaining questions make the…

President's Task Force on Communications Policy, Washington, DC.

394

An overview of the communications technology satellite project: Executive summary  

NASA Technical Reports Server (NTRS)

An overview of the Communications Technology Satellite (CTS) project, a joint venture between NASA and the Canadian Department of Communications is given. A brief technical description of the CTS spacecraft and its cognate hardware and operations, a history of the CTS project, and a list of the CTS experiments and demonstrations conducted during the course of the project are given.

Rapp, W.; Ogden, D.; Wright, D.

1982-01-01

395

A digital transmission system for global maritime satellite communications  

Microsoft Academic Search

A digital transmission system for global maritime satellite communications has been designed, and experimental communications equipment has been developed, taking account of its potential application to the Inmarsat system where analog modulation is currently used for telephone signal transmission. This paper discusses possible digital technologies to realize an efficient digital transmission system, and presents a concept for the designed system.

Y. Hirata; Y. Yasuda; H. Okinaka; K. Kashiki

1984-01-01

396

HTS microstrip bipin antenna array for broadband satellite communication  

Microsoft Academic Search

In this paper we report the broadband antenna array made of high-Tc superconducting (HTS) thin films. Though HTS antennas have high efficiency and high gain, narrow bandwidth due to the high Q is the major limitation for application of satellite communication and mobile communication. Defining bandwidth as the frequency range over which standing wave ratio (SWR) is 2:1 or less,

Dong-Chul Chung

2003-01-01

397

Frequency allocation problem in a SDMA satellite communication system  

E-print Network

Frequency allocation problem in a SDMA satellite communication system Laurent Houssina SDMA (Spatial Division Multiple Access) is a principle of radio resource sharing that relies on the division of the space dimension into separated communication channels. SDMA basically relies on adaptive

Boyer, Edmond

398

Computer Modeling and Simulation of Communications Satellite Channels  

Microsoft Academic Search

Computer modeling of satellite communications channels is a valuable adjunct to analytical modeling and hardware simulation for predicting and verifying communications link performance. In the computer simulation approach, sampled signals are created in the computer and operated on by algorithms that simulate the effects of filtering, channel nonlinearities, interference, and noise. After passage through the simulated channel, the distorted signals

LARRY C. PALMER

1984-01-01

399

GRAND MYCOLOGY SYMPOSIUM Photo: Becky Kirkland, NC State Communications Services  

E-print Network

GRAND MYCOLOGY SYMPOSIUM #12;Photo: Becky Kirkland, NC State Communications Services #12;Photo Services #12;Photo: Becky Kirkland, NC State Communications Services #12;GRAND MYCOLOGY SYMPOSIUM RECEPTION

400

47 CFR 25.273 - Duties regarding space communications transmissions.  

Code of Federal Regulations, 2011 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations...regarding space communications transmissions...Transmit to a satellite unless the...

2011-10-01

401

47 CFR 25.273 - Duties regarding space communications transmissions.  

Code of Federal Regulations, 2012 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations...regarding space communications transmissions...Transmit to a satellite unless the...

2012-10-01

402

47 CFR 25.273 - Duties regarding space communications transmissions.  

Code of Federal Regulations, 2010 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations...regarding space communications transmissions...Transmit to a satellite unless the...

2010-10-01

403

47 CFR 25.273 - Duties regarding space communications transmissions.  

Code of Federal Regulations, 2013 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations...regarding space communications transmissions...Transmit to a satellite unless the...

2013-10-01

404

47 CFR 25.273 - Duties regarding space communications transmissions.  

Code of Federal Regulations, 2014 CFR

...Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED...CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations...regarding space communications transmissions...Transmit to a satellite unless the...

2014-10-01

405

Evaluation of spacecraft technology programs (effects on communication satellite business ventures), volume 1  

NASA Technical Reports Server (NTRS)

Commercial organizations as well as government agencies invest in spacecraft (S/C) technology programs that are aimed at increasing the performance of communications satellites. The value of these programs must be measured in terms of their impacts on the financial performane of the business ventures that may ultimately utilize the communications satellites. An economic evaluation and planning capability was developed and used to assess the impact of NASA on-orbit propulsion and space power programs on typical fixed satellite service (FSS) and direct broadcast service (DBS) communications satellite business ventures. Typical FSS and DBS spin and three-axis stabilized spacecraft were configured in the absence of NASA technology programs. These spacecraft were reconfigured taking into account the anticipated results of NASA specified on-orbit propulsion and space power programs. In general, the NASA technology programs resulted in spacecraft with increased capability. The developed methodology for assessing the value of spacecraft technology programs in terms of their impact on the financial performance of communication satellite business ventures is described. Results of the assessment of NASA specified on-orbit propulsion and space power technology programs are presented for typical FSS and DBS business ventures.

Greenburg, J. S.; Gaelick, C.; Kaplan, M.; Fishman, J.; Hopkins, C.

1985-01-01

406

A Guide to Satellite Communication. Reports and Papers on Mass Communication Number 66.  

ERIC Educational Resources Information Center

Basic information about the characteristics, uses, and implications of communication satellites is presented. Characteristics covered include the various types of systems--such as point-to-point, distribution, and broadcasting satellites--and the flexibility, capacity, geographical coverage, cost and disadvantages of satellites. The section on…

United Nations Educational, Scientific, and Cultural Organization, Paris (France).

407

Advanced Communications Technology Satellite (ACTS): Four-Year System Performance  

NASA Technical Reports Server (NTRS)

The Advanced Communications Technology Satellite (ACTS) was conceived at the National Aeronautics and Space Administration (NASA) in the late 1970's as a follow-on program to ATS and CTS to continue NASA's long history of satellite communications projects. The ACTS project set the stage for the C-band satellites that started the industry, and later the ACTS project established the use of Ku-band for video distribution and direct-to-home broadcasting. ACTS, launched in September 1993 from the space shuttle, created a revolution in satellite system architecture by using digital communications techniques employing key technologies such as a fast hopping multibeam antenna, an on-board baseband processor, a wide-band microwave switch matrix, adaptive rain fade compensation, and the use of 900 MHz transponders operating at Ka-band frequencies. This paper describes the lessons learned in each of the key ACTS technology areas, as well as in the propagation investigations.

Acosta, Roberto J.; Bauer, Robert; Krawczyk, Richard J.; Reinhart, Richard C.; Zernic, Michael J.; Gargione, Frank

1999-01-01

408

Hybrid system of communication and positioning determination using two geostationary satellites  

NASA Astrophysics Data System (ADS)

A new hybrid satellite system has been developed which can provide both communications and positioning services in one system using two geostationary satellites. The first distinctive feature is that location information can be provided by transmitting and receiving ranging signals over the same channel that is used for voice communication employing two geostationary satellites. The second is that the frequency bandwidth of the system is very narrow compared with those of the GPS (Global Positioning System) and GEOSTAR. The experimental system, equipment configuration, and positioning accuracy are discussed. The dominant error factor of position determination was found to be the tracking error of the delay-lock loop of a receiver, and it was estimated to be several meters and several tens of meters in the spread-spectrum and single-channel-per-carrier systems, respectively. Taking account of satellite motions of ETS-V and INMARSAT, a positioning accuracy of several hundreds of meters was found in Pacific Ocean areas.

Morikawa, Eihisa; Matsumoto, Yasushi; Ohmori, Shingo; Wakao, Masayoshi

1991-04-01

409

Payload for the first experimental Indian communication satellite 'APPLE'  

NASA Astrophysics Data System (ADS)

A development history is presented for the Communication Payload of the Ariane Passenger Payload Experiment (APPLE) geosynchronous satellite, which had to meet stringent technological and scheduling requirements. The APPLE spacecraft objectives have allowed the gaining of expertise in communication payload design that is applicable to the Indian National Satellite system. Payload subsystems were developed separately, and the communication transponder was devised after their integration. Attention is given to a quality assurance program, encompassing all aspects of material and component selection, design, fabrication, and testing and evaluation. Design work began in 1977, and an engineering model was completed by the end of 1978.

Lasrado, L.; Ramiah, V.; Shetty, P. N. R.; Pillai, N. S.; Singh, S. K.; Singh, B.; Gupta, R. K.; Garg, V. K.; Saxena, R.; Singh, R.

1983-11-01

410

EHF (28/19 GHz) personal communications satellite terminal development  

NASA Technical Reports Server (NTRS)

The concept of communicating on a personal basis using a small terminal has been investigated globally from many different applications and technology perspectives. Applications range from terrestrial handheld communicators for paging, cellular, zone voice/data networks, etc., to satellite terminals of pocket dimensions for voice/low speed data or similar terminals using larger antennas for VSAT, news gathering (30 cm), and video (1.2 m). A brief status of some developments in the satellite personal communications at CRC will be presented.

Pike, Corey

1991-01-01

411

Land vehicle antennas for satellite mobile communications  

NASA Technical Reports Server (NTRS)

The RF performance, size, pointing system, and cost were investigated concepts are: for a mechanically steered 1 x 4 tilted microstrip array, a mechanically steered fixed-beam conformal array, and an electronically steered conformal phased array. Emphasis is on the RF performance of the tilted 1 x 4 antenna array and methods for pointing the various antennas studied to a geosynchronous satellite. An updated version of satellite isolations in a two-satellite system is presented. Cost estimates for the antennas in quantities of 10,000 and 100,000 unites are summarized.

Haddad, H. A.; Pieper, B. V.; Mckenna, D. B.

1985-01-01

412

Communication (Oral and Written) Service Oriented.  

E-print Network

Communication (Oral and Written) Service Oriented. Social Perceptiveness Reading Comprehension Physicians Office Nursing Home Hospice Home Health Care School System Disability Services Non-Profit Organization POSSIBLE EMPLOYERS Ambulatory Care Nurse Cardiac Care Nurse Correctional Facility Nurse Critical

Jiang, Huiqiang

413

Future large broadband switched satellite communications networks  

NASA Technical Reports Server (NTRS)

Critical technical, market, and policy issues relevant to future large broadband switched satellite networks are summarized. Our market projections for the period 1980 to 2000 are compared. Clusters of switched satellites, in lieu of large platforms, etc., are shown to have significant advantages. Analysis of an optimum terrestrial network architecture suggests the proper densities of ground stations and that link reliabilities 99.99% may entail less than a 10% cost premium for diversity protection at 20/30 GHz. These analyses suggest that system costs increase as the 0.6 power of traffic. Cost estimates for nominal 20/30 GHz satellite and ground facilities suggest optimum system configurations might employ satellites with 285 beams, multiple TDMA bands each carrying 256 Mbps, and 16 ft ground station antennas. A nominal development program is outlined.

Staelin, D. H.; Harvey, R. R.

1979-01-01

414

Study of LEO-SAT microwave link for broad-band mobile satellite communication system  

NASA Technical Reports Server (NTRS)

In the field of mobile satellite communications, a system based on low-earth-orbit satellites (LEO-SAT's) such as the Iridium system has been proposed. The LEO-SAT system is able to offer mobile telecommunication services in high-latitude areas. Rain degradation, fading and shadowing are also expected to be decreased when the system is operated at a high elevation angle. Furthermore, the propagation delay generated in the LEO-SAT system is less pronounced than that in the geostationary orbit satellite (GEO-SAT) system and, in voice services, the effect of the delay is almost negligible. We proposed a concept of a broad-band mobile satellite communication system with LEO-SAT's and Optical ISL. In that system, a fixed L-band (1.6/1.5 GHz) multibeam is used to offer narrow band service to the mobile terminals in the entire area covered by a LEO-SAT and steerable Ka-band (30/20 GHz) spot beams are used for the wide band service. In this paper, we present results of a study of LEO-SAT microwave link between a satellite and a mobile terminal for a broad-band mobile satellite communication system. First, the results of link budget calculations are presented and the antennas mounted on satellites are shown. For a future mobile antenna technology, we also show digital beamforming (DBF) techniques. DBF, together with modulation and/or demodulation, is becoming a key technique for mobile antennas with advanced functions such as antenna pattern calibration, correction, and radio interference suppression. In this paper, efficient DBF techniques for transmitting and receiving are presented. Furthermore, an adaptive array antenna system suitable for this LEO-SAT is presented.

Fujise, Masayuki; Chujo, Wataru; Chiba, Isamu; Furuhama, Yoji; Kawabata, Kazuaki; Konishi, Yoshihiko

1993-01-01

415

47 CFR 25.261 - Procedures for avoidance of in-line interference events for Non Geostationary Satellite Orbit...  

Code of Federal Regulations, 2013 CFR

...Network Operations in the Fixed-Satellite Service (FSS) Bands. 25...261 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2013-10-01

416

47 CFR 25.261 - Procedures for avoidance of in-line interference events for Non Geostationary Satellite Orbit...  

Code of Federal Regulations, 2010 CFR

...Network Operations in the Fixed Satellite Service (FSS) Bands. 25...261 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2010-10-01

417

47 CFR 25.261 - Procedures for avoidance of in-line interference events for Non Geostationary Satellite Orbit...  

Code of Federal Regulations, 2011 CFR

...Network Operations in the Fixed Satellite Service (FSS) Bands. 25...261 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2011-10-01

418

47 CFR 25.278 - Additional coordination obligation for non-geostationary and geostationary satellite systems in...  

Code of Federal Regulations, 2011 CFR

...frequencies allocated to the fixed-satellite service. 25.278 Section 25.278 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations §...

2011-10-01

419

47 CFR 25.278 - Additional coordination obligation for non-geostationary and geostationary satellite systems in...  

Code of Federal Regulations, 2013 CFR

...frequencies allocated to the fixed-satellite service. 25.278 Section 25.278 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations §...

2013-10-01

420

47 CFR 25.278 - Additional coordination obligation for non-geostationary and geostationary satellite systems in...  

Code of Federal Regulations, 2012 CFR

...frequencies allocated to the fixed-satellite service. 25.278 Section 25.278 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations §...

2012-10-01

421

47 CFR 25.278 - Additional coordination obligation for non-geostationary and geostationary satellite systems in...  

Code of Federal Regulations, 2010 CFR

...frequencies allocated to the fixed-satellite service. 25.278 Section 25.278 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations §...

2010-10-01

422

47 CFR 25.261 - Procedures for avoidance of in-line interference events for Non Geostationary Satellite Orbit...  

Code of Federal Regulations, 2012 CFR

...Network Operations in the Fixed Satellite Service (FSS) Bands. 25...261 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Standards §...

2012-10-01

423

47 CFR 25.278 - Additional coordination obligation for non-geostationary and geostationary satellite systems in...  

Code of Federal Regulations, 2014 CFR

...frequencies allocated to the fixed-satellite service. 25.278 Section 25.278 Telecommunication FEDERAL COMMUNICATIONS COMMISSION (CONTINUED) COMMON CARRIER SERVICES SATELLITE COMMUNICATIONS Technical Operations §...

2014-10-01

424

Propagation considerations for emerging satellite communications applications  

Microsoft Academic Search

The effects of rain and other propagation concerns for new applications areas, currently in operation or planned for implementation by the end of this decade, are described. The areas include: VSAT systems employing low operating margins and\\/or low elevation angles; traditional communications applications operating with inclined geosynchronous orbits; and mobile and personal communications applications employing networks of low earth orbit

THOMAS A. RUSSELL

1993-01-01

425

AeroTCP: A Splitting Transport Protocol for an IP-based Satellite Network Supporting Aeronautical Communications  

E-print Network

Communications Yadong Shang* , Michael Hadjitheodosiou and John Baras Center for Satellite & Hybrid Communication to establish broadband aeronautical communication networks. Satellite network is recognized as one- ocean coverage. The expected advantages of the satellite systems for aeronautical communications also

Baras, John S.

426

Communication Access to Health and Social Services  

ERIC Educational Resources Information Center

This article describes the efforts of a group of people in the United Kingdom at Connect-the communication disability network-to make health and social services more communicatively accessible to people with aphasia. The project involved listening to people with aphasia talk about their experiences with health and social care services and working…

Parr, Susie; Pound, Carole; Hewitt, Alan

2006-01-01

427

Development of a mobile satellite communication unit  

NASA Technical Reports Server (NTRS)

A compact 210(W) x 280(H) x 330(D) mm mobile terminal capable of transmitting voice and data through L-band mobile satellites is described. The Voice Codec can convert an analog voice to or from digital codes at rates of 9.6, 8 and 4.8 kb/s by an MPC algorithm. The terminal functions with a single 12 V power supplied vehicle battery. The equipment can operate at any L-band frequency allocated for mobile uses in a full duplex mode and will soon be put into a field test via Japans's ETS-V satellite.

Suzuki, Ryutaro; Ikegami, Tetsushi; Hamamoto, Naokazu; Taguchi, Tetsu; Endo, Nobuhiro; Yamamoto, Osamu; Ichiyoshi, Osamu

1988-01-01

428

Research on telescope array for inter-satellites laser communication  

NASA Astrophysics Data System (ADS)

Recent years have seen an explosive increase in the application of inter-satellites laser communication system. Considerations make phased arrays an attractive target for optical communication applications. This paper proposes a novel telescope array for inter-satellites laser communication and investigates phased telescope arrays to be employed in receive terminals of free-space laser inter-satellites communication links. Potential advantages over single monolithic telescopes consist in non-mechanical adaptive fine pointing of the mainlobe and a reduction of terminal volume, mass and cost. First, the basic function, the interfaces, and the performance parameters of one telescope are given. Next, the structure of a receive telescope array are described, and then the performance parameters of this telescope array are discussed. The different performances including antenna gain and pattern of optical antenna and telescope array in inter-satellites laser communication system are given in this part. A quantitative assessment reveals that arrays using coaxial beam superposition are best suited for optical data communications. Based on this finding, the main characteristics of superimposing telescope arrays are calculated. And calculations prove that, in practical applications, telescope array has better performance than one telescope used in laser inter-satellites communication, and even more, the influence of incoherent background radiation is negligible. The analyses results show that smart antenna is better than optical antenna in this communication system. In many important aspects of phased array design, we will consider 1) Frequency Synchronization and 2) Beam steering as being of primary importance to the present analysis. Frequency synchronization is necessary for proper beam spatial coherence, while beam steering is critical to how this cohered beam is pointed in a desired direction. We will address system performance and implementation aspects of both issues in fiber optic control. Three basic architectures for beam steering control via optics have been reported and proposed.

Zhou, Li; Wen, Chuanhua

2006-09-01

429

Achieving QoS for TCP Traffic in Satellite Networks with Differentiated Services  

NASA Technical Reports Server (NTRS)

Satellite networks play an indispensable role in providing global Internet access and electronic connectivity. To achieve such a global communications, provisioning of quality of service (QoS) within the advanced satellite systems is the main requirement. One of the key mechanisms of implementing the quality of service is traffic management. Traffic management becomes a crucial factor in the case of satellite network because of the limited availability of their resources. Currently, Internet Protocol (IP) only has minimal traffic management capabilities and provides best effort services. In this paper, we presented a broadband satellite network QoS model and simulated performance results. In particular, we discussed the TCP flow aggregates performance for their good behavior in the presence of competing UDP flow aggregates in the same assured forwarding. We identified several factors that affect the performance in the mixed environments and quantified their effects using a full factorial design of experiment methodology.

Durresi, Arjan; Kota, Sastri; Goyal, Mukul; Jain, Raj; Bharani, Venkata

2001-01-01

430

Improving Library Services to Satellite Campuses: The Case of the University of Lethbridge  

ERIC Educational Resources Information Center

A survey was done of instructors at two satellite campuses located at a distance from the main campus of the University of Lethbridge in order to ascertain both utilization and awareness of library resources and services. Results were enlightening, indicating that lack of awareness and communication is one of the biggest obstacles for these…

Eva, Nicole C.

2012-01-01

431

76 FR 17650 - Federal Communications Commission Recharters and Seeks Nominations for Membership on the...  

Federal Register 2010, 2011, 2012, 2013, 2014

...and organizations representing communications service providers, including wireline and wireless communications service providers, broadcast...video programming distributors, satellite communications service providers,...

2011-03-30

432

Thin-route rural communications using Intelsat satellites  

NASA Astrophysics Data System (ADS)

Application requirements exist and are growing in developing countries for telecommunications services that can be supplied best by use of satellite technology. Many of these requirements can be satisfied with one or two telephone circuits per earth station location. In many areas of the world, the only satellite capacity available to support these thin-route service requirements is in the Intelsat system. Small earth stations, suited economically and sized to provide the required thin-route service capacity, have not been common in the Intelsat system. However, Intelsat is recognizing the need for thin-route services and the opportunities that will develop for providing these services using small earth stations in the Intelsat system. This paper explores the potential advantages of continuously-variable-slope delta modulation (CVSD) voice encoding and the technical parameters of small earth stations suited for thin-route services, as well as the developments within Intelsat for responding to these service needs.

Jennings, R. D.; McManamon, P. M.

433

Spread spectrum mobile communication experiment using ETS-V satellite  

NASA Technical Reports Server (NTRS)

The spread spectrum technique is attractive for application to mobile satellite communications, because of its random access capability, immunity to inter-system interference, and robustness to overloading. A novel direct sequence spread spectrum communication equipment is developed for land mobile satellite applications. The equipment is developed based on a matched filter technique to improve the initial acquisition performance. The data rate is 2.4 kilobits per sec. and the PN clock rate is 2.4552 mega-Hz. This equipment also has a function of measuring the multipath delay profile of land mobile satellite channel, making use of a correlation property of a PN code. This paper gives an outline of the equipment and the field test results with ETS-V satellite.

Ikegami, Tetsushi; Suzuki, Ryutaro; Kadowaki, Naoto; Taira, Shinichi; Sato, Nobuyasu

1990-01-01

434

Hitchhiker payloads for new commercial satellite services  

NASA Astrophysics Data System (ADS)

A hitchhiker package is an addition to a satellite which provides a payload capability not previously present on the satellite and which utilizes a relatively minor portion of the available satellite resources. In this paper, feasibility considerations for hitchhiker packages are discussed in a general way, and some practical hitchhiker packages are described. These are the Search and Rescue Satellite Aided Tracking System (SARSAT), the Geostar Radio Determination (RDSS) hitchhiker packages, the Aviation Satellite (Avsat) proposed early entry system, and the Mobile Satellite (MSS) proposed early entry system.

Elizondo, E. L.; Buntschuh, R. F.; Seliga, J. F.

435

Computer-aided communication satellite system analysis and optimization  

NASA Technical Reports Server (NTRS)

The capabilities and limitations of the various published computer programs for fixed/broadcast communication satellite system synthesis and optimization are discussed. A satellite Telecommunication analysis and Modeling Program (STAMP) for costing and sensitivity analysis work in application of communication satellites to educational development is given. The modifications made to STAMP include: extension of the six beam capability to eight; addition of generation of multiple beams from a single reflector system with an array of feeds; an improved system costing to reflect the time value of money, growth in earth terminal population with time, and to account for various measures of system reliability; inclusion of a model for scintillation at microwave frequencies in the communication link loss model; and, an updated technological environment.

Stagl, T. W.; Morgan, N. H.; Morley, R. E.; Singh, J. P.

1973-01-01

436

Commercial optical inter-satellite communication at high data rates  

NASA Astrophysics Data System (ADS)

Laser communication terminals with data rates far above 1 Gbps have been in operation in orbit since January 2008, and the links established between two low Earth orbit (LEO) satellites have demonstrated error-free communication. Bit error rates better than 10-11 have been achieved without data encoding. Signal acquisition can be reproducibly achieved within a few seconds. After adaptation to larger link separation distances these laser communication terminals will be used in the low earth orbit-geosynchronous satellite (LEO-GEO) link of European data relay satellite (EDRS), the GEO European data relay system. LEO-to-ground and ground-to-LEO links have examined the impact of the atmosphere on such optical links. In the future, high data rate GEO-to-ground links will require ground stations equipped with adaptive optics, which are currently under development.

Gregory, Mark; Heine, Frank; Kämpfner, Hartmut; Lange, Robert; Lutzer, Michael; Meyer, Rolf

2012-03-01

437

Communication Satellite Systems Conference, 11th, San Diego, CA, March 17-20, 1986, Technical Papers  

NASA Astrophysics Data System (ADS)

User-oriented satellite systems for the 1990's are considered along with a satellite system for aeronautical data communications, the colocation of geostationary communication satellites, an application of intersatellite links to domestic satellite systems, global interconnectivity in the next two decades, an analysis of the Geostar position determination system, and possible architectures for a European data relay satellite system. Attention is given to optimum antenna beam pointing for communication satellites, communications satellites versus fiber optics, spread spectrum-based synchronization of digital satellite transmissions, the Geostationary Satellite Orbit Analysis Program (GSOAP), technology achievements and projections for communication satellites of the future, and trends and development of low noise amplifiers using new FET device. Other topics explored are related to the Omninet mobile satellite system, the Space Transportation System, Japan's launch vehicles, the French military satellite system, and geostationary communications platform payload concepts.

1986-03-01

438

Performance-aware Security of Unicast Communication in Hybrid Satellite Networks  

E-print Network

Performance-aware Security of Unicast Communication in Hybrid Satellite Networks Ayan Roy for securing the end-to-end communication in hybrid satellite networks. Satellite networks use TCP and HTTP communication in hybrid satellite networks. We therefore propose the use of the Layered IPSEC (LES) protocol

Baras, John S.

439

An adaptive array antenna for mobile satellite communications  

NASA Technical Reports Server (NTRS)

The design of an adaptive array antenna for land vehicle operation and its performance in an operational satellite system is described. Linear and circularly polarized antenna designs are presented. The acquisition and tracking operation of a satellite is described and the effect on the communications signal is discussed. A number of system requirements are examined that have a major impact on the antenna design. The results of environmental, power handling, and RFI testing are presented and potential problems are identified.

Milne, Robert

1990-01-01

440

The 30/20 GHz fixed communications systems service demand assessment. Volume 2: Main report  

NASA Technical Reports Server (NTRS)

A forecast of demand for telecommunications services through the year 2000 is presented with particular reference to demand for satellite communications. Estimates of demand are provided for voice, video, and data services and for various subcategories of these services. The results are converted to a common digital measure in terms of terabits per year and aggregated to obtain total demand projections.

Gamble, R. B.; Seltzer, H. R.; Speter, K. M.; Westheimer, M.

1979-01-01

441

R&D of a Next Generation LEO System for Global Multimedia Mobile Satellite Communications  

NASA Astrophysics Data System (ADS)

Next-generation LEO System Research Center (NeLS) was formed in the end of 1997 as a research group under the Telecommunications Advancement Organization of Japan, in cooperation with the telecommunications operators, manufacturers, universities and governmental research organization. The aim of this project is to develop new technology for global multimedia mobile satellite communications services with a user data rate around 2Mbps for handy terminals. component of the IMT-2000, and the second generation of the big-LEO systems. In prosecuting this project, two-phase approach, phase 1 and phase 2, is considered. Phase 1 is the system definition and development of key technologies. In Phase 2, we plan to verify the developed technology in Phase 1 on space. From this year we shifted the stage to Phase 2, and are now developing the prototype of on-board communication systems for flight tests, which will be planed at around 2006. The satellite altitude is assumed to be 1200 km in order to reduce the number of satellites, to avoid the Van Allen radiation belts and to increase the minimum elevation angle. Ten of the circular orbits with 55 degree of inclination are selected to cover the earth surface from -70 to 70 degree in latitude. 12 satellites are positioned at regular intervals in each orbit. In this case, the minimum elevation angle from the user terminal can be keep more than 20 degree for the visibility of the satellite, and 15 degree for simultaneous visibility of two satellites. Then, NeLS Research Center was focusing on the development of key technologies as the phase 1 project. Four kinds of key technologies; DBF satellite antenna, optical inter-satellite link system, satellite network technology with on-board ATM switch and variable rate modulation were selected. Satellite Antenna Technology: Development of on-board direct radiating active phased array antenna with digital beam forming technology would be one of the most important breakthroughs for the satellite communication systems. Therefore, the experimental DBF network with 16 radiating elements was developed for confirming a basic signal processing performance. A/D sampled data are processed by using FPGA circuit for beam forming by real-time basis. Optical Inter-Satellite Link Technology: The inter-satellite link (ISL) technology is also important, because the inter-satellite network is essential to realize the low delay network connection for multimedia services. The optical ISL simulator was developed for the study of optical modem and optical tracking mechanism. And the sensitivity of 56 photons/bit at 10-9 of error rate has been achieved by employing the Erbium doped fiber amplifier, polarizing filter and narrow band optical filter. Coude path type, the active universal joint (AUJ) type and two flat mirror type of optical antenna mechanism were developed. Satellite Network Technology: For constructing this optical ISL ring, the utilization of wavelength division multiplexing (WDM) technology is envisaged. By applying WDM technology to the optical intra-orbital ISL, logical mesh connections can be achieved by assigning the appropriate wavelength for the links among satellites. By using inclined orbit, inter-orbital ISL connection can be keep continuously. Therefore, WDM technology is also applicable to the inter-orbital ISL network. The satellite ATM network simulator was developed in order to investigate the effect of delay fluctuation caused by the satellite constellations. This simulator works as real-time basis by using commercial ATM switches and personal computers. This simulator was installed Dijkstra's algorithm to determine satellite routing path in order to minimize the end-to-end delay time from the source terminal to the destination terminal. The satellite IP network simulator has been developed in order to evaluate the congestion of the multimedia traffic. Variable Rate Modulation Technology: Considering the propagation impairments in the mobile conditions, we employ the variable rate transmission, which maintains the communication service

Morikawa, E.; Motoyoshi, S.; Koyama, Y.; Suzuki, R.; Yasuda, Y.

2002-01-01

442

Space station automation study-satellite servicing, volume 2  

NASA Technical Reports Server (NTRS)

Technology requirements for automated satellite servicing operations aboard the NASA space station were studied. The three major tasks addressed: (1) servicing requirements (satellite and space station elements) and the role of automation; (2) assessment of automation technology; and (3) conceptual design of servicing facilities on the space station. It is found that many servicing functions cloud benefit from automation support; and the certain research and development activities on automation technologies for servicing should start as soon as possible. Also, some advanced automation developments for orbital servicing could be effectively applied to U.S. industrial ground based operations.

Meissinger, H. F.

1984-01-01

443

Effects of atmospheric scintillation in Ka-band satellite communications  

NASA Astrophysics Data System (ADS)

This research is motivated by the need to characterize the effects of atmospheric scintillation on Ka-band satellite communications. The builders of satellite communications systems are planning to utilize Ka-band in more than a dozen systems that have been proposed for launch in the next decade. The NASA ACTS (Advanced Communication Technology Satellite) program has provided a means to investigate the problems associated with Ka-band satellite transmissions. Experimental measurements have been conducted using a very small aperture terminal (VSAT) to evaluate the effects of scintillation on narrowband and wideband signals. The theoretical background of scintillation theory is presented, noting especially the additional performance degradation predicted for wideband Ka-band systems using VSATs. Experimental measurements of the amplitude and phase variations in received narrowband carrier signals were performed, using beacon signals transmitted by ACTS and carrier signals which are relayed through the satellite. Measured amplitude and phase spectra have been compared with theoretical models to establish the presence of scintillation. Measurements have also been performed on wideband spread spectrum signals which are relayed through ACTS to determine the bit-error rate degradation of the digital signal resulting from scintillation effects. The theory and measurements presented for the geostationary ACTS have then been applied to a low-earth orbiting satellite system, by extrapolating the effects of the moving propagation path on scintillation.

Borgsmiller, Scott A.

444

47 CFR 1.4000 - Restrictions impairing reception of television broadcast signals, direct broadcast satellite...  

Code of Federal Regulations, 2012 CFR

...direct broadcast satellite services or multichannel...Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL...Direct Broadcast Satellite Services, or Multichannel...Transmit Fixed Wireless Communications Signals § 1.4000...direct broadcast satellite services or...

2012-10-01

445

47 CFR 1.4000 - Restrictions impairing reception of television broadcast signals, direct broadcast satellite...  

Code of Federal Regulations, 2011 CFR

...direct broadcast satellite services or multichannel...Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL...Direct Broadcast Satellite Services, or Multichannel...Transmit Fixed Wireless Communications Signals § 1.4000...direct broadcast satellite services or...

2011-10-01

446

47 CFR 1.4000 - Restrictions impairing reception of television broadcast signals, direct broadcast satellite...  

Code of Federal Regulations, 2013 CFR

...direct broadcast satellite services or multichannel...Telecommunication FEDERAL COMMUNICATIONS COMMISSION GENERAL...Direct Broadcast Satellite Services, or Multichannel...Transmit Fixed Wireless Communications Signals § 1.4000...direct broadcast satellite services or...

2013-10-01

447

78 FR 39200 - Federal Earth Stations-Non-Federal Fixed Satellite Service Space Stations; Spectrum for Non...  

Federal Register 2010, 2011, 2012, 2013, 2014

...13-115; RM-11341; FCC 13-65] Federal Earth Stations--Non-Federal Fixed Satellite...and Mobile- Satellite Service (MSS) earth stations operated by Federal agencies under...proposals in the NPRM to provide Federal earth stations that communicate with...

2013-07-01

448

Interference susceptibility measurements for an MSK satellite communication link  

NASA Technical Reports Server (NTRS)

The results are presented of measurements of the degradation of an MSK satellite link due to modulated and CW (unmodulated) interference. These measurements were made using a hardware based satellite communication link simulator at NASA-Lewis. The results indicate the amount of bit error rate degradation caused by CW interference as a function of frequency and power level, and the degradation caused by adjacent channel and cochannel modulated interference as a function of interference power level. Results were obtained for both the uplink case (including satellite nonlinearity) and the downlink case (linear channel).

Kerczewski, Robert J.; Fujikawa, Gene

1992-01-01

449

Experimental millimeter-wave personal satellite communications system  

NASA Technical Reports Server (NTRS)

Communications Research Laboratory (CRL) has investigated an advanced millimeter (mm)-wave satellite communications system for personal use. Experiments in mm-wave personal satellite communication are to be conducted for 3 years using Japan's Engineering Test Satellite VI (ETS-VI). This paper describes an experimental mm-wave (43/38 GHz) personal satellite communication system, including an onboard transponder and an earth terminal. The on-board transponder is almost completed, and the ground experiment system is still in the design stage. The transponder employs advanced mm-wave solid state technology. It uses 38 GHz high power solid state amplifiers to accelerate the development of mm-wave solid state devices which are indispensable to personal earth terminals. The transponder consists of a 43 GHz receiver with a built-in low noise amplifier, an IF filter section with very narrow bandwidth to improve the carrier-to-noise power ratio of the weak personal communication signal, and two high power amplifiers using newly developed high power Gallium Arsenide (GaAs) metal-semiconductor field effect transistors (MESFETs).

Suzuki, Yoshiaki; Kimura, Shigeru; Shimada, Masaaki; Tanaka, Masato; Takahashi, Yasuhiro

1991-01-01

450

Utilization of photovoltaic for broadband satellite communications in rural area of Thailand  

NASA Astrophysics Data System (ADS)

Electricity, Information and Communication Technologies (ICTs) are very important not only in urban areas but also in rural areas. To provide ICTs service in rural areas, sources of electricity and communication infrastructures must be implemented. Electricity is a major condition due to the fact that all electronic devices needed it in order to power on, so that it is impossible to operate any forms of ICTs in areas where the main national grid line is unavailable. Almost rural areas of Thailand where the main national grid line is unavailable have very good sunlight intensity. Photovoltaic is the most effective renewable energy technologies in those areas for meeting electricity needed in areas that are not connected to the main national grid line. In this paper, the efficiency utilization of photovoltaic as source of electricity for broadband satellite communication systems as well as social and economic impact and quality of life of people in rural areas of Thailand are presented. The results show that most rural communities would be able to universally access to the basic telecommunications services such as internet access and public telephone via satellite communication systems. However, in some field case study, broadband internet access via satellite communication may be unnecessary for some rural communities and the most exactly rural communities needed are electricity for household usage and battery charger.

Jinayim, Theerawut; Mungkung, Narong; Kasayapanand, Nat

2013-06-01

451

Performance Limitations of a Free-Space Optical Communication Satellite Network Owing to Vibrations: Heterodyne Detection  

Microsoft Academic Search

Free-space optical communication between satellites in a distributed network can permit high data rates of communication between different places on Earth. To establish optical communication between any two satellites requires that the line of sight of their optics be aligned during the entire communication time. Because of the large distance between the satellites and the alignment accuracy required, the pointing

Shlomi Arnon; Stanley R. Rotman; Norman S. Kopeika

1998-01-01

452

Some proposed experiments with the Communications Technology Satellite  

NASA Technical Reports Server (NTRS)

The satellite (CTS) is tentatively scheduled to be launched in January 1976. It will be available for educational and societal experimentation early in 1977. This paper will outline some of the educational experiments involving the CTS. The major object of the experiments is to assess the communications and educational implications of the CTS in northern Ontario; the existing communications facilities for this region of approximately 725,000 sq km (inhabited largely by native people) are extremely limited. It is expected to assess the extent to which: (1) a satellite communications system might resolve the communications deficiency, (2) the native people will use the experimental facility, and (3) health and general educational programs, especially utilizing the interactive mode, will be viable.

Porter, A.

1975-01-01

453

Advanced Communication Technology Satellite (ACTS) multibeam antenna technology verification experiments  

NASA Technical Reports Server (NTRS)

The Advanced Communication Technology Satellite (ACTS) is a key to reaching NASA's goal of developing high-risk, advanced communications technology using multiple frequency bands to support the nation's future communication needs. Using the multiple, dynamic hopping spot beams, and advanced on board switching and processing systems, ACTS will open a new era in communications satellite technology. One of the key technologies to be validated as part of the ACTS program is the multibeam antenna with rapidly reconfigurable hopping and fixed spot beam to serve users equipped with small-aperature terminals within the coverage areas. The proposed antenna technology experiments are designed to evaluate in-orbit ACTS multibeam antenna performance (radiation pattern, gain, cross pol levels, etc.).

Acosta, Roberto J.; Larko, Jeffrey M.; Lagin, Alan R.

1992-01-01

454

Optical deep space communication via relay satellite  

NASA Technical Reports Server (NTRS)

The possible use of an optical for high rate data transmission from a deep space vehicle to an Earth-orbiting relay satellite while RF links are envisioned for the relay to Earth link was studied. A preliminary link analysis is presented for initial sizing of optical components and power levels, in terms of achievable data rates and feasible range distances. Modulation formats are restricted to pulsed laser operation, involving bot coded and uncoded schemes. The advantage of an optical link over present RF deep space link capabilities is shown. The problems of acquisition, pointing and tracking with narrow optical beams are presented and discussed. Mathematical models of beam trackers are derived, aiding in the design of such systems for minimizing beam pointing errors. The expected orbital geometry between spacecraft and relay satellite, and its impact on beam pointing dynamics are discussed.

Gagliardi, R. M.; Vilnrotter, V. A.; Dolinar, S. J., Jr.

1981-01-01

455

Satellites vs. fiber optics based networks and services - Road map to strategic planning  

NASA Astrophysics Data System (ADS)

An overview of a generic telecommunications network and its components is presented, and the current developments in satellite and fiber optics technologies are discussed with an eye on the trends in industry. A baseline model is proposed, and a cost comparison of fiber- vs satellite-based networks is made. A step-by-step 'road map' to the successful strategic planning of telecommunications services and facilities is presented. This road map provides for optimization of the current and future networks and services through effective utilization of both satellites and fiber optics. The road map is then applied to different segments of the telecommunications industry and market place, to show its effectiveness for the strategic planning of executives of three types: (1) those heading telecommunications manufacturing concerns, (2) those leading communication service companies, and (3) managers of telecommunication/MIS departments of major corporations. Future networking issues, such as developments in integrated-services digital network standards and technologies, are addressed.

Marandi, James H. R.

456

47 CFR 64.617 - Neutral Video Communication Service Platform.  

Code of Federal Regulations, 2014 CFR

...2014-10-01 2014-10-01 false Neutral Video Communication Service Platform. 64...With Disabilities § 64.617 Neutral Video Communication Service Platform. ...Commission are required to utilize the Neutral Video Communication Service Platform to...

2014-10-01

457

47 CFR 64.617 - Neutral Video Communication Service Platform.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Neutral Video Communication Service Platform. 64...With Disabilities § 64.617 Neutral Video Communication Service Platform. ...Commission are required to utilize the Neutral Video Communication Service Platform to...

2013-10-01

458

Satellite Technologies and Services: Implications for International Distance Education.  

ERIC Educational Resources Information Center

This examination of international distance education and open university applications of communication satellites at the postsecondary level notes activities in less developed countries (LDCs); presents potential models for cooperation; and describes technical systems for distance education, emphasizing satellite technology and possible problems…

Stahmer, Anna

1987-01-01

459

Modulation/demodulation techniques for satellite communications. Part 1: Background  

NASA Technical Reports Server (NTRS)

Basic characteristics of digital data transmission systems described include the physical communication links, the notion of bandwidth, FCC regulations, and performance measurements such as bit rates, bit error probabilities, throughputs, and delays. The error probability performance and spectral characteristics of various modulation/demodulation techniques commonly used or proposed for use in radio and satellite communication links are summarized. Forward error correction with block or convolutional codes is also discussed along with the important coding parameter, channel cutoff rate.

Omura, J. K.; Simon, M. K.

1981-01-01

460

Fiber optic links for millimeter wave communication satellites  

Microsoft Academic Search

Large-aperture phased-array antennas operating at millimeter-wave frequencies are designed for space-based communications and imaging. Array elements are comprised of active transmit\\/receive (T\\/R) modules which are linked to the central processing unit through a high-speed fiber-optic network. Experimental results are reported that demonstrate optical control of active modules for satellite communication at 24 GHz. An approach called T\\/R level data mixing,

A. S. Daryoush; A. P. S. Khanna; K. Bhasin; R. Kunath

1988-01-01

461

Fault-tolerant onboard digital information switching and routing for communications satellites  

NASA Technical Reports Server (NTRS)

The NASA Lewis Research Center is developing an information-switching processor for future meshed very-small-aperture terminal (VSAT) communications satellites. The information-switching processor will switch and route baseband user data onboard the VSAT satellite to connect thousands of Earth terminals. Fault tolerance is a critical issue in developing information-switching processor circuitry that will provide and maintain reliable communications services. In parallel with the conceptual development of the meshed VSAT satellite network architecture, NASA designed and built a simple test bed for developing and demonstrating baseband switch architectures and fault-tolerance techniques. The meshed VSAT architecture and the switching demonstration test bed are described, and the initial switching architecture and the fault-tolerance techniques that were developed and tested are discussed.

Shalkhauser, Mary JO; Quintana, Jorge A.; Soni, Nitin J.; Kim, Heechul

1993-01-01

462

An active retrodirective array for satellite communications  

Microsoft Academic Search

The concept and design of an active retrodirective array, resulting from the specialized requirements and constraints of space\\/earth communications, is presented. The advantages of employing active microwave gain are discussed. The attendant problem of instability is defined and several aspects of the solution, namely frequency offsetting and polarization isolation, are detailed. The latter technique makes use of orthogonally polarized \\

S. Andre; D. Leonard

1964-01-01

463

Caribbean Regional Communications Service Study. Report.  

ERIC Educational Resources Information Center

A follow-up to a limited experiment with the use of satellites in education and public service conducted by the University of the West Indies (UWI) in 1978, this study explores the feasibility of providing a number of services, which would include an extension system based on the use of the UWI telecommunications network. The study was designed to…

Lalor, Gerald C.

464

Planning for the Broadcasting-Satellite Service in the United States of America  

NASA Astrophysics Data System (ADS)

The state of the Western Hemisphere's Broadcasting Satellite Service (BSS) system will be determined at the International Telecommunications Union 1983 Regional Administrative Radio Conference (RARC-83) for Region 2. A discussion is presented of the opportunities and problems presented by BSS in the U.S., and mechanisms by which the Federal Communications Commission (FCC) is integrating private sector advice into its planning for the conference are considered. Among the services purveyed by applicants to the Direct Broadcast Satellite (DBS) system are sponsored rebroadcast, subscription, and leased channels.

Clark, J. F.

1981-09-01

465

Multiple beam lens antenna for LEO communication satellite  

Microsoft Academic Search

The design of a multiple beam antenna system for a low earth orbiting (LEO) cellular communication satellite is a topic of current interest. A typical uplink requirement is to provide a number of closely overlapping beams to illuminate Earth-fixed super cells at Ka band. These cells span a field of view of approximately ±40° degrees in elevation and azimuth. Their

K. K. Chan; R. Blasing; B. Wallace

1996-01-01

466

Onboard processing for a 30/20 GHz communications satellite  

NASA Technical Reports Server (NTRS)

A systems configuration for the baseband processor for a TDMA communications satellite utilizing the 30 GHz uplink and 20 GHz downlink bands will be discussed. The baseband processor functions include QPSK burst demodulation, convolutional decoding, data routing, encoding, QPSK modulation, and antenna steering. The performance of the burst demodulator will be examined. Power and weight estimates for the baseband processor will be presented.

Reisenfeld, S.

1982-01-01

467

Prediction of the effects of rain on satellite communication systems  

Microsoft Academic Search

The major propagation effects for satellite communication systems operating above 4 GHz are caused by rain. With the possible exceptions of depolarization and multiple scattering at frequencies above 20 GHz, these effects may be calculated if the distribution of rain intensity is known in both time and space. The major effects-attenuation and interference-require information about path and volume averaged rain

R. K. Crane

1977-01-01

468

Long-Distance Quantum Communication with Entangled Photons using Satellites  

E-print Network

The use of satellites to distribute entangled photon pairs (and single photons) provides a unique solution for long-distance quantum communication networks. This overcomes the principle limitations of Earth-bound technology, i.e. the narrow range of some 100 km provided by optical fiber and terrestrial free-space links.

Markus Aspelmeyer; Thomas Jennewein; Martin Pfennigbauer; Walter Leeb; Anton Zeilinger

2003-05-19

469

Orbital performance of communication satellite microwave power amplifiers (MPAs)  

Microsoft Academic Search

This paper presents background data on the performance of microwave power amplifiers (MPAs) used as transmitters in currently operating commercial communication satellites. Specifically aspects of two competing MPA types are discussed. These are well known TWTA (travelling wave tube amplifier) and the SSPA (solid state power amplifier). Extensive in-orbit data has been collected from over 2000 MPAs in 1991 and

R. Strauss

1993-01-01

470

Dual offset reflector multibeam antenna for international communications satellite applications  

Microsoft Academic Search

Dual offset reflector antenna systems offer exciting possibilities for achieving both low scan losses and low cross polarization in geosynchronous communications satellite antennas providing narrow and multiple beam frequency reuse coverages over an 18 deg conical field of view. Novel geometrical configurations for the reflectors are characterized by simultaneously achieving: (1) blockage-free apertures for all element beams within the 18

R. Jorgensen; P. Balling; W. J. English

1985-01-01

471

FET Mixers for Communication Satellite Transponders  

Microsoft Academic Search

Two different types of FET mixer circuits have been developed for 6\\/4 GHz frequency translation for communications sateIIite transponder. Gate mixer uses non-linear I d - V g characteristic, with LO being injected into the gate circuit, while in the drain mixer the LO is injected into the drain circuit and non-linear I d - V d characteristic is utilized.

P. Bura; R. Dikshit

1976-01-01

472

Communications satellites in the national and global health care information infrastructure: their role, impact, and issues  

NASA Technical Reports Server (NTRS)

Health care services delivered from a distance, known collectively as telemedicine, are being increasingly demonstrated on various transmission media. Telemedicine activities have included diagnosis by a doctor at a remote location, emergency and disaster medical assistance, medical education, and medical informatics. The ability of communications satellites to offer communication channels and bandwidth on demand, connectivity to mobile, remote and under served regions, and global access will afford them a critical role for telemedicine applications within the National and Global Information Infrastructure (NII/GII). The importance that communications satellites will have in telemedicine applications within the NII/GII the differences in requirements for NII vs. GII, the major issues such as interoperability, confidentiality, quality, availability, and costs, and preliminary conclusions for future usability based on the review of several recent trails at national and global levels are presented.

Zuzek, J. E.; Bhasin, K. B.

1996-01-01

473

47 CFR 76.66 - Satellite broadcast signal carriage.  

Code of Federal Regulations, 2013 CFR

...satellite carrier is an entity that uses the facilities of a satellite or satellite service licensed by the Federal Communications Commission, and operates in the Fixed-Satellite Service under part 25 of title 47 of the Code of Federal...

2013-10-01

474

47 CFR 76.66 - Satellite broadcast signal carriage.  

Code of Federal Regulations, 2012 CFR

...satellite carrier is an entity that uses the facilities of a satellite or satellite service licensed by the Federal Communications Commission, and operates in the Fixed-Satellite Service under part 25 of title 47 of the Code of Federal...

2012-10-01

475

47 CFR 76.66 - Satellite broadcast signal carriage.  

Code of Federal Regulations, 2011 CFR

...satellite carrier is an entity that uses the facilities of a satellite or satellite service licensed by the Federal Communications Commission, and operates in the Fixed-Satellite Service under part 25 of title 47 of the Code of Federal...

2011-10-01

476

47 CFR 76.66 - Satellite broadcast signal carriage.  

Code of Federal Regulations, 2014 CFR

...satellite carrier is an entity that uses the facilities of a satellite or satellite service licensed by the Federal Communications Commission, and operates in the Fixed-Satellite Service under part 25 of title 47 of the Code of Federal...

2014-10-01

477

Applications of Multi Port Amplifier to personal satellite communications  

NASA Technical Reports Server (NTRS)

In personal satellite communications, satellite antenna beam becomes narrow, and number of beams will be thirty to more than one hundred. This paper shows that Multi Port Amplifier is most suitable to multiple beam transmitter for personal communications satellite. It was shown that the single beam coverage area(cell) diameter is determined by personal earth station(PES) eirp, uplink C/No and uplink frequency band. Required number of cells for European or North American regional coverage at FPLMTS uplink frequency band is shown as around 32. It was shown that 32 beams systems will be easily implemented by using 2 set of 16-port MPA. Redundancy to SSPA failure is considered by increasing number of SSPAs. Actual configuration for 16-port MPA are briefly shown. The presented configuration will be easy to implement and the most economical solution.

Egami, Shunichiro

1995-01-01

478

Extravehicular Crewman Work System (ECWS) study program. Volume 3: Satellite service  

NASA Technical Reports Server (NTRS)

The satellite service portion of the Extravehicular Crewman Work System Study defines requirements and service equipment concepts for performing satellite service from the space shuttle orbiter. Both normal and contingency orbital satellite service is required. Service oriented satellite design practices are required to provide on orbit satellite service capability for the wide variety of satellites at the subsystem level. Development of additional satellite service equipment is required. The existing space transportation system provides a limited capability for performing satellite service tasks in the shuttle payload bay area.

Wilde, R. C.

1980-01-01

479

Land Mobile Satellite Service (LMSS): A conceptual system design and identification of the critical technologies: Part 2: Technical report  

NASA Technical Reports Server (NTRS)

A conceptual system design for a satellite-aided land mobile service is described. A geostationary satellite which employs a large (55-m) UHF reflector to communicate with small inexpensive user antennas on mobile vehicles is discussed. It is shown that such a satellite system through multiple beam antennas and frequency reuse can provide thousands of radiotelephone and dispatch channels serving hundreds of thousands of users throughout the U.S.

Naderi, F. (editor)

1982-01-01

480

Emergency Communications over Satellite: the WISECOM Approach  

Microsoft Academic Search

This paper presents the overall architecture of the WISECOM system, which can quickly re-establish and provide telecommunication services after a disaster. The architecture is explained and it is described together with a role model, which adapts to the system. The work tries to map the existing complex interactions taking place nowadays in an emergency situation to a sensible architecture, which

M. Berioli; N. Courville; M. Werner

2007-01-01

481

Concepts for 18/30 GHz satellite communication system, volume 1  

NASA Technical Reports Server (NTRS)

Concepts for 18/30 GHz satellite communication systems are presented. Major terminal trunking as well as direct-to-user configurations were evaluated. Critical technologies in support of millimeter wave satellite communications were determined.

Jorasch, R.; Baker, M.; Davies, R.; Cuccia, L.; Mitchell, C.

1979-01-01

482

77 FR 51045 - Certain Two-Way Global Satellite Communication Devices, System and Components Thereof; Notice of...  

Federal Register 2010, 2011, 2012, 2013, 2014

...Certain Two-Way Global Satellite Communication Devices, System and Components...Certain Two-Way Global Satellite Communication Devices, System and Components...importation of certain satellite communication devices, systems....

2012-08-23

483

Performance studies of Low Earth Orbit Satellite (LEOS) communication networks for global communications  

SciTech Connect

Communicating appropriate information to desired destinations is of critical importance to the Air Force and the Department of Defense (DoD). The communications infrastructure used to provide this information must be reliable and also efficient in terms of minimizing delay. Additionally, {open_quotes}anytime and anywhere{close_quotes} communication capabilities are desired of the infrastructure. In order to provide global communications, satellite communication systems must be used for primary as well as supplemental communication mediums. Satellite communication systems can be used to provide the infrastructure with the {open_quotes}anytime and anywhere{close_quotes} capability. Recent advances in microelectronic and cellular radio technologies have allowed for the proposed implementation of low earth orbit satellite (LEOS) communication networks for global personal communications. This paper examines the performance of LEOS networks in a packet-switched environment. Performance is defined here in terms of link availability and reliability in a faulty environment. An overview of LEOS systems is provided, as well as critical issues associated with the implementation of such a system. To illustrate the nature of LEOS network communications, the commercially proposed system Iridium is examined. {copyright} {ital 1997 American Institute of Physics.}

Raines, R.A.; Janoso, R.F.; Stenger, D.K. [Department of Electrical and Computer Engineering Air Force Institute of Technology Wright-Patterson AFB, Ohio45433-7765 (United States)

1997-01-01

484

Compatibility - A challenge to universal communications Global cables and satellite communication  

Microsoft Academic Search

The prognosis for worldwide communications is discussed from six viewpoints. A look at the future roles of satellites and submarine cables, an evaluation of the advances in international telephone routing, and a CCITT progress report are presented. The technical and economic tasks necessary to achieve compatibility are outlined, and Comsat's organizational structure, and its relationship to international communications, is appraised.

T. B. Westfall

1966-01-01

485

Communications Satellites: A New Channel for International Communications, A New Source of International Tension.  

ERIC Educational Resources Information Center

Communications satellites could be the subject of bitter and potentially dangerous international controversy. They threaten to upset the comfortable monopoly of internal national communications systems which have enrolled national governments to screen intrusions of unwanted information or ideas. The United Nations Working Committee on Direct…

Mickelson, Sig

486

NASA satellite communications application research. Phase 2: Efficient high power, solid state amplifier for EFH communications  

Microsoft Academic Search

The final report describes the work performed from 9 Jun. 1992 to 31 Jul. 1993 on the NASA Satellite Communications Application Research (SCAR) Phase 2 program, Efficient High Power, Solid State Amplifier for EHF Communications. The purpose of the program was to demonstrate the feasibility of high-efficiency, high-power, EHF solid state amplifiers that are smaller, lighter, more efficient, and less

James Benet

1993-01-01

487

Land Mobile Satellite Service (LMSS): A conceptual system design and identification of the critical technologies. Part 1: Executive summary  

NASA Technical Reports Server (NTRS)

A system design for a satellite aided land mobile service is described. The advanced system is based on a geostationary satellite which employs a large UHF reflector to communicate with small user antennas on mobile vehicles. It is shown that the system through multiple beam antennas and frequency reuse provides for radiotelephone and dispatch channels. It is concluded that the system is technologically feasible to provide service to rural and remote regions.

Naderi, F. (editor)

1982-01-01

488

AIAA International Communication Satellite Systems Conference and Exhibit, 14th, Washington, DC, Mar. 22-26, 1992, Technical Papers. Pts. 1-3  

SciTech Connect

The present conference on international communication satellite systems discusses GEO launch vehicle development, military Satcom systems, GEO mobile Satcom systems, advanced transponder technology, and digital network architecture. Attention is given to digital network architecture, the optical Satcom system, emerging launch alternatives, military and government Satcom systems, satellite communications developments in newly industrialized nations, launch options to nongeostationary orbits, and data relay satellite technology. Topics addressed include LEO satellite systems, earth terminal technology, personal communications, high data rate links via satellite, Italsat, antenna systems, Intelsat system and service development, new spacecraft system concepts, orbit/spectrum allocation and use, and ACTS technology. Also discussed are array antenna technology, VSAT and other small terminal systems, orbits, propagation, onboard satellite switching, reflector antenna technology, and panel small communication satellite systems.

Not Available

1992-01-01

489

Integrated technology services publications and communications strategy  

Microsoft Academic Search

In September 2006, Integrated Technology Services (ITS) at the University of New Brunswick (UNB) refocused their Publications and Communications position in an effort to better communicate their mission, vision, goals, and values to the UNB community and external audiences. ITS recognized that the UNB community did not understand the importance of what ITS does, how ITS supports UNB's mission and

Melissa R. Hannah

2007-01-01

490

Development of a modular on-orbit serviceable satellite architecture  

Microsoft Academic Search

This paper describes an to develop an avionics architecture that enables replacement of deficient satellite hardware on-orbit as well as upgrade\\/adapt on-orbit systems. It is anticipated that routine, safe, and reliable spacecraft servicing will have significant payoff for many future types of science and military missions. The technologies that enable modern satellite servicing will therefore be critical for implementing new

Stephen A. Moynahan; Seamus Touhy

2001-01-01

491

Technical and economic feasibility of integrated video service by satellite  

NASA Technical Reports Server (NTRS)

The trends and roles of satellite based video services in the year 2010 time frame are examined based on an overall network and service model for that period. Emphasis is placed on point to point and multipoint service, but broadcast could also be accommodated. An estimate of the video traffic is made and the service and general network requirements are identified. User charges are then estimated based on several usage scenarios. In order to accommodate these traffic needs, a 28 spot beam satellite architecture with on-board processing and signal mixing is suggested.

Price, Kent M.; Garlow, R. K.; Henderson, T. R.; Kwan, Robert K.; White, L. W.

1992-01-01

492

Vibration-induced jitter control in satellite optical communication  

NASA Astrophysics Data System (ADS)

Laser satellite communication has become especially attractive in recent years. However, because the laser beam is very narrow and there is a long distance between satellites, the laser communication channel is very sensitive to vibrations of the optical platform. These vibrations cause optical jitter, leading to the reduction of received signals and bit-error rate degradation. Consequently, optical jitter control with PAT (pointing acquisition and tracking) subsystems is a critical problem in laser satellite communication. To compensate for the platform vibration effectively in realtime, in this paper, an adaptive feedback control technique based on Youla-parameterization is presented, which can adapt to the current disturbance acting on the laser beam by adjusting its parameters in realtime to maintain optimal performance. The main idea is to use the well-known Youla parameterization formula to construct a feedback control scheme with the guaranteed closed loop stability, and the feedback controller is a function of plant coprime factors and a free parameter Q. For adaptive disturbance estimation, the free parameter Q is set to an adaptive finite impulse response (FIR) filter, the coefficients of which are updated by a recursive least-squares (RLS) algorithm in realtime. It is shown in experiment that the adaptive feedback control technique based on Youla-parameterization can reject the optical jitter caused by satellite platform vibration effectively and improve the performance of the system.

Xue, Zheng-yan; Qi, Bo; Ren, Ge

2013-08-01

493

Economic case for the retirement of geosynchronous communication satellites via space tugs  

NASA Astrophysics Data System (ADS)

Both the United Nations (UN) and the US Federal Communications Commission (FCC) have published a ruling that calls for geostationary earth orbit (GEO) satellites to be placed in a disposal orbit at the end of their operational lives. Current procedures utilize spacecraft residual propellant and represent a major life-limiting factor for GEO satellites. An alternative approach would be to allow a space tug to capture and move the satellites after all of their fuel has been exhausted. This extended lifetime can provide significant additional revenue to some satellite operators. Before committing to such a capability, however, the lifecycle costs of a space tug infrastructure must be carefully weighed against the opportunity costs of the current retirement practice. This paper investigates the questions of tug costs, perceived benefits, and service fee. It builds a framework that can be used in evaluating various on-orbit servicing opportunities and proposes that the service fee should be charged as a percentage of the additional revenue received by the satellite operators and analyzes how cost estimation uncertainties affect the value of on-orbit tugging. The presented analysis concludes that until advanced propulsion systems gain greater use, retirement via a space tug will be of value for the 10-20 most expensive GEO assets.

Galabova, Kalina K.; de Weck, Olivier L.

2006-05-01

494

The Transformational Satellite Communications System (TSAT) is poised to become the DoD's next generation  

E-print Network

1 of 7 ABSTRACT The Transformational Satellite Communications System (TSAT) is poised to become, as well as providing security at physical and link layer. I. INTRODUCTION Satellite communications, the US Government has a history of deploying pro- tected satellite communications systems, beginning

Touch, Joe

495

Space Communications 21 (2007/2008) 6982 69 Satellite system performance assessment for  

E-print Network

Space Communications 21 (2007/2008) 69­82 69 IOS Press Satellite system performance assessment. Concurrent satellite systems have been proposed for IFE (In-Flight Entertainment) communications, thus. At the same time, an increasing interest in the use of satellite communications for ATC (Air Traffic Control

Mailhes, Corinne

496

Optimizing Satellite Communications With Adaptive and Phased Array Antennas Mary Ann Ingram  

E-print Network

Optimizing Satellite Communications With Adaptive and Phased Array Antennas Mary Ann Ingram the focus of the current project is for a ground station to communicate with only one satellite at a time communication with mul- tiple satellites. Two phased array technologies are being investigated by re- searchers

Ingram, Mary Ann

497

Frequency allocation problem in a SDMA satellite communication system Laurent Houssin12  

E-print Network

Frequency allocation problem in a SDMA satellite communication system Laurent Houssin12 , Christian to a clever algorithm in charge of resource allocation. As satellite communication systems move towards) in a satellite communication system involving a gateway connected to a terrestrial network and some user

Paris-Sud XI, Université de

498

22nd AIAA International Communications Satellite Systems Conference & Exhibit 2004 9 -12 May 2004, Monterey, California  

E-print Network

22nd AIAA International Communications Satellite Systems Conference & Exhibit 2004 9 -12 May 2004 of satellite technology for aeronautical communications, the airline industry is developing a design for a global satellite-based communications system to meet the needs of the aviation industry [2]. Copyright

Baras, John S.

499

Neuronal somatic ATP release triggers neuron satellite glial cell communication in dorsal  

E-print Network

Neuronal somatic ATP release triggers neuron­ satellite glial cell communication in dorsal root activates P2X7 receptors in satellite cells that enwrap each DRG neuron and triggers the communication neuronal somata and thus triggers bidirectional communication between neurons and satellite cells. Results

Newman, Eric A.

500

Design of Rate Constrained Multi-user Receivers for Satellite Communications  

E-print Network

Design of Rate Constrained Multi-user Receivers for Satellite Communications Sami Mekki Ecole: merouane.debbah@supelec.fr Abstract--In the realm of satellite communications, one of the great impairments allocation for successive interference cancellation can enhance the performance of satellite communications

Paris-Sud XI, Université de