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Proceedings of the IEEE

Issue 7 • Date Jul 1990

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Displaying Results 1 - 22 of 22
  • On-board switching and processing

    Publication Year: 1990, Page(s):1206 - 1213
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (748 KB)

    Findings from NASA's space electronics division's (SED's) advanced systems studies related to future communications satellite services that will require onboard switching and processing technology are reviewed. SED's digital signal switching and processing technology program is reviewed. This program responds to specific systems technology development needs for enabling commercial development of f... View full abstract»

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  • Propagation considerations in satellite communication systems

    Publication Year: 1990, Page(s):1275 - 1282
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (640 KB)

    Radiowave propagation phenomena that affect the performance of satellite communication systems are concisely discussed to introduce some topics in propagation research related to satellite systems design and to illustrate related problems and uncertainties. The focus is on tropospheric effects. A summary of relevant propagation impairments is supplied, and general classes of impairments, the physi... View full abstract»

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  • Architectural trends in military satellite communications systems

    Publication Year: 1990, Page(s):1176 - 1189
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1048 KB)

    A historical overview of military communications by satellites and a detailed description of current systems are provided. The capabilities of present systems are reviewed in relation to user requirements and threats. It is concluded that use of satellite communications by a large number of small-terminal users (aircraft, ships, submarines, and land mobiles) still requires major technological inno... View full abstract»

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  • The European data relay system: present concept and future evolution

    Publication Year: 1990, Page(s):1152 - 1164
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    After briefly reviewing the users' requirements and the results of traffic scenario simulations needed to size the system, the design of the European data relay system (DRS) (ground and space segment) is presented in detail. The interrelationship with the other data relay systems (NASA's tracking and data relay satellite system (TDRSS) And the Japanese data relay and tracking satellite system (DRT... View full abstract»

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  • Satellite direct broadcast

    Publication Year: 1990, Page(s):1116 - 1140
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1780 KB)

    A brief history and commentary on the development of satellite direct broadcast (direct broadcast satellite, or DBS) to small user terminals is given, and the interrelations among the technical, economic, and political aspects are discussed. The fundamental technical problems in the transmission of video and audio directly to small user terminals are reviewed at a basic level, and points of partic... View full abstract»

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  • Management and control of CCSDS cross-support services

    Publication Year: 1990, Page(s):1304 - 1310
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    A candidate architecture for management and control of Consultative Committee for Space Data Systems (CCSDS) services is presented. An operations concept is presented. Candidate management procedures and a management information base for the resources to be managed are suggested. This architecture is based on concepts of network management of computer and telecommunication networks which are under... View full abstract»

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  • Operation of higher layer data communication protocols over satellite links

    Publication Year: 1990, Page(s):1289 - 1294
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    The International Standards Organization's (ISO's) seven-layer reference model for computer communication protocols is discussed. The layering arises out of the stratification of functions across the layers. The various protocol functions performed at each higher layer are examined in detail, identifying the appropriate procedures that affect the efficient operation of these protocols over satelli... View full abstract»

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  • Modulation and coding for satellite and space communications

    Publication Year: 1990, Page(s):1250 - 1266
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1308 KB)

    Several modulation and coding advances supported by NASA are summarized. To support long-constraint-length convolutional code, a VLSI maximum-likelihood decoder, utilizing parallel processing techniques, which is being developed to decode convolutional codes of constraint length 15 and a code rate as low as 1/6 is discussed. A VLSI high-speed 8-b Reed-Solomon decoder which is being developed for a... View full abstract»

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  • Communication protocol standards for space data systems

    Publication Year: 1990, Page(s):1295 - 1303
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    The main elements and requirements of advanced space data networks are identified. The communication protocol standards for use on space missions during the coming decades are described. In particular, the blending of high-performance space-unique data transmission techniques with off-the-shelf open systems interconnection (OSI) protocols is described View full abstract»

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  • VSAT technology, trends, and applications

    Publication Year: 1990, Page(s):1087 - 1095
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    A survey of very small aperture terminal (VSAT) technology is provided, and systems and services using VSAT technology are described. Trends in VSAT technology and applications, the three general categories of VSAT networks (broadcast, point-to-point, and interactive), and system architecture and design are discussed View full abstract»

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  • Fixed satellite service frequency allocations and orbit assignment procedures for commercial satellite systems

    Publication Year: 1990, Page(s):1283 - 1288
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The international regulatory framework which resulted form the 1988 International Telecommunication Union (ITU) Conference on Space Services (ORB-88) and its potential effect on the implementation of US satellite systems are discussed. The impact of several significant results of ORB-88 on the ability of the FCC to assign geostationary satellite orbital positions within the US and to secure intern... View full abstract»

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  • The role of technology in influencing future civil communications satellites

    Publication Year: 1990, Page(s):1190 - 1205
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2304 KB)

    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 comp... View full abstract»

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  • INTELSAT VII: a flexible spacecraft for the 1990s and beyond

    Publication Year: 1990, Page(s):1057 - 1074
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1224 KB)

    An overview of the INTELSAT VII spacecraft program is presented. The overview begins at the spacecraft definition stage with an outline of the key mission objectives. A description of the spacecraft, with particular emphasis on the payload equipment and capabilities, is provided. Key features of the competitive selection process are highlighted. Current and future innovations in the program and me... View full abstract»

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  • Advanced communications technology satellite (ACTS) and potential system applications

    Publication Year: 1990, Page(s):1165 - 1175
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    A description of the advanced communications technology satellite (ACTS) system is given with special emphasis on the communication characteristics. Potential satellite communications scenarios, including future operational ACTS-like satellite systems, are discussed. The description of the ACTS system updates previously published ACTS system references. Detailed information on items such as experi... View full abstract»

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  • Source coding of speech and video signals

    Publication Year: 1990, Page(s):1233 - 1249
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1460 KB)

    Some digital source coding techniques for speech and video are reviewed. Predictive coding of speech, multipulse and code-excited coders and frequency-domain coders are discussed and compared for the coding of speech signals, and intraframe and still image coding and interframe coding are examined for the coding of image and video signals. The emphasis is on those algorithms that offer high compre... View full abstract»

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  • Land mobile satellite systems

    Publication Year: 1990, Page(s):1107 - 1115
    Cited by:  Papers (18)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    The general advantages and potential operating characteristics of the mobile satellite service (MSS) are described, and distinctions are made between radio telephone, which is interconnected to the public switched telephone network, and private mobile radio systems. Mobile satellite service offers voice, data, position location, and paging services, interconnection to the public switched telephone... View full abstract»

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  • Satellite communications systems and technology, circa 2000

    Publication Year: 1990, Page(s):1039 - 1056
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3648 KB)

    The authors discuss many satellite communications systems and technology concepts that can be expected by the year 2000. Challenges and changes that are taking place in the commercial market place are discussed. Technology advances that promise to enable future communications satellites to capture their share of the future marketplace are discussed. Current, near-term, and far-term technologies ar... View full abstract»

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  • Advances in multibeam communications satellite antennas

    Publication Year: 1990, Page(s):1214 - 1232
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1456 KB)

    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 deve... View full abstract»

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  • NASA's advanced tracking and data relay satellite system for the years 2000 and beyond

    Publication Year: 1990, Page(s):1141 - 1151
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (804 KB)

    An advanced tracking and data relay satellite system (ATDRSS) reference architecture that embodies many of the system features and technological enhancements considered essential is presented and described. The architectural and user service features of the existing TDRSS are reviewed, and certain evolutionary features that will take place by the mid-1990s are discussed. NASA's projected user serv... View full abstract»

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  • Radio determination satellite service

    Publication Year: 1990, Page(s):1096 - 1106
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    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 n... View full abstract»

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  • VSAT data networks

    Publication Year: 1990, Page(s):1267 - 1274
    Cited by:  Papers (20)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    The use of satellite channels for very small-aperture terminal (VSAT) data networks such as spread spectrum and ALOHA is reviewed. Certain basic aspects of the architecture of VSAT data networks are discussed. Although spread spectrum and ALOHA have different origins and are sometimes represented as competing technologies, they can in fact be characterized as different ways of viewing the same low... View full abstract»

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  • Domestic and regional satellite systems

    Publication Year: 1990, Page(s):1075 - 1086
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1548 KB)

    The technical characteristics of domestic and regional satellite systems are discussed. Spacecraft technology is reviewed, communication payload technology developments are discussed, and resources and economics are considered. It is seen that, compared to the installation of terrestrial microwave or optical cable networks in remote and harsh areas, satellite systems offer both lower costs and sho... View full abstract»

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North Carolina State University