Satellite Communication Systems
Yes, we are being followed, all the time. They maintain their distance from us, remaining just nearly in sight. They are continuously collecting information about us, and they are continuously sending signals to us. Now, before getting scared, I must reveal that these followers of ours are nothing but Man-Made Satellites. In fact, the word “Satellite” even means “Follower” in Latin. Satellites are following us continually, revolving the earth in their orbits and continually sending and receiving information with the help of satellite communication systems.
Early era of the satellite communication systems
The Second World War resulted in a spur of development of two seemingly discreet technologies-missiles and microwaves. Very soon, expertise was gained on these two fields when it was first thought of the confluence of these two technologies, which resulted in the era of satellite communications. The first artificial satellite was the Sputnik of theUSSR, though it wasn’t exactly a communications satellite. The first ever communication with the help of a satellite was when Christmas greetings were broadcast by US President Eisenhower on Christmas Eve, 1958. Since then we have come to a stage where normal life without satellite communication systems looks nearly unimaginable. Satellites nowadays are being used in fields of meteorology, GPS tracking, mining applications, DVB/DTH television systems, internet and mobile communications.
A closer look into satellite communication systems
Let us now look into the basic structure of a satellite communication system. It is composed of three units: