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Satellite communications are simply communications between radio stations on the earth (both on the ground and in the lower atmosphere) using satellites as a follow-up.The satellite communication system consists of satellite and earth station.The characteristics of satellite communication are: wide communication range;Communication can be made between any two points as long as the satellite's radio waves are within range;Not susceptible to land hazards (high reliability);As long as the earth station circuit can be set up (open the circuit quickly);At the same time can be received in more than one place, can economically achieve broadcast, multi-access communication (multi-access characteristics);The circuit setting is very flexible, which can disperse the over-concentrated traffic at any time;The same channel can be used in different directions or on different intervals (multiple access joins).The satellite service market mainly includes mass consumer communications, satellite fixed services and satellite mobile services, among which mass consumer communications occupies the main market, accounting for 83.13% of the market in 2017, mainly including satellite radio and television services and operations.A Chinese satellite mobile communication market has a large growth space.At present, the main domestic companies providing satellite communications services include China satcom, asia-pacific satellite, Asian satellite and collaborative communications.According to the annual report data of each company, asia-pacific satellite and Asian satellite together operate about 14 Gbps bandwidth, and only part of the resources are provided domestically.The cooperative communication is the subcontract operator of thaicom-4 "IPSTAR" in China. The total bandwidth of this satellite is 45 Gbps, and the bandwidth available in China is 12 Gbps.In addition, China satcom also has part of the satellite bandwidth resources.
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