Thursday, 29 December 2011

How do Satellites Work

Two Stations on Earth want to communicate through radio broadcast but are too far away to use conventional means.

Earth stations send information in the form of high powered, high frequency (GHz range) signals 
        to satellites which receive and retransmit the signals back to earth where they are received by other earth stations in the coverage area of the satellite. The area which receives a signal of useful strength from the satellite is known as the satellite's footprint. 

The transmission system from the earth station to the satellite is called the uplink, and the system from the satellite to the earth station is called the downlink.
The two stations can use a satellite as a relay station for their communication
One Earth Station sends a transmission to the satellite.  This is called a Uplink.
The satellite Transponder converts the signal and sends it down to the second earth station.  This is called a Downlink.

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