Satellite communication , in short , is the communication among earth (including ground , water surface , and low-layer atmosphere) radio communication stations, using man-made satellite as relay station .
The sketch here is a simplified satellite communication system . The radio signal transmitted by the earth station A via directional antenna pointing to communication satellite, is received first by communication satellite antenna . After being amplified and converted by satellite transponders, the signal will be transmitted to the earth station B by satellite antenna . As soon as the earth station B receives the signal , the information transfer process from station A to station B is completed. The communication path from the earth station to the space station ( communication satellite ) is called uplink . The communication path from the space station( communication satellite ) to the earth station is called downlink. Similarly, the earth station B can also transmit signal to the earth station A through satellite to transfer information.
Large
communication area. Any two places within the coverage of radio
transmission by satellite can communicate with each other.
Seldom
effected by land disaster ( high reliability)
Circuit
can be started upon establishing earth station (prompt circuit
starting)
Can
be received at many places simultaneously, and realize broadcast,
multi-access communication economically( feature of multi-access)
Very
flexible circuit installment , can disperse over-centralized traffic
at any time.
One
channel can be used in different directions or areas (multi-access
connecting).
Satellite
communication sketch
Feature
of satellite communication
Application
of satellite communication
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