Cellular Networks, Satellite Communication 1 Satellite Communication
نویسنده
چکیده
A satellite communications system is based on antennas in a stable orbit above the earth. Satellites serve as relay stations in the sky. The basic idea of satellite communications is that two stations on earth discuss via one or more satellites. So a little bit of satellite-related terminology: 1. Earth station is an antenna on or near the surface of the earth. 2. Uplink is a transmission from an earth station to a satellite. 3. Downlink is a transmission from a satellite to an earth station. 4. Transponder is the component in the satellite that takes an uplink signal and converts it to a downlink signal. Satellites can be categorized according to their: 1. Coverage area: (a) LEO = low earth orbit (b) MEO = middle earth orbit (c) GEO = geostationary earth orbit 2. Service type (a) FSS = fixed service statellite (b) BSS = broadcast service satellite (c) MSS = mobile service satellite 3. General usage (a) commercial
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