Land mobile satellite systems
Article Abstract:
A mobile satellite service (MSS) provides ubiquitous service with unlimited range; it is used primarily to provide a versatile and affordable communications capability for non-urban Americans. MSS characteristics include availability of voice, data, messaging, position location, and paging from a single radio; transcontinental-range; two-way national signaling; flexible routing; affordable distance-insensitive costs; high performance, especially in woody and mountainous terrain; and the capability to supply radio telephone interconnection and private systems. There are two kinds of MSS: private mobile radio service and radio telephone service. Radio telephone service is connected to the public switched telephone network. Private mobile radio service consists of the satellite, mobiles, and a base station located on the user's premises. The market for private mobile radio service include transportation, oil services, public safety, and inland and intracoastal marine.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1990
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Domestic and regional satellite systems
Article Abstract:
The US is shifting much of the long-distance voice trunk traffic from communications satellite networks to fiber optical cable; much of the rest of the world is continuing to develop communications satellite networks, which offer lower costs and shorter time to bring on line. Growth is likely on the C-band first, followed by the K-band (Ku or Ka). The number and power level of transponder channels have increased because of lighter weight structures, more efficient electrical power conversion, and higher specific impulse propulsion. Advances in receiver sensitivity, amplifier reliability, and modem efficiency also contribute to lowering system operating costs. The number of domestic communications satellites is increasing as satellites become a major component of national and regional communications networks.
Publication Name: Proceedings of the IEEE
Subject: Electronics
ISSN: 0018-9219
Year: 1990
User Contributions:
Comment about this article or add new information about this topic:
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