The most important are Geo Stationary Earth Orbits, also known as GEO Satellites. These satellites revolve around the earth in complete synchronization with the earth’s movement around itself.

GEO Satellites are exactly 35,786 kilometers around the earth’s orbit. These satellites revolve exactly at the same speed as our earth and seem stationary in their orbit. Due to their height from earth, they seem like at the same position and do not deviate from their path. Satellite channels are transmitted from GEO satellites.  3 – 4 GEO Satellites can cover the complete earth’s crust and cover a huge geographical area.

Satellites play a key role in communication around the earth. The most essential part of earth centric satellites is their power system. All the satellites have huge wings which contain solar cells. The satellites use the sun’s solar energy to power them and perform every day routine activities. Satellites have two frequencies. One is uplink and the other is downlink. Satellite takes the uplink in the form of a beam pointing towards it and it spreads the rays downwards with a downlink frequency. In the middle time, it modulates and demodulates the frequency spectrum and performs specific functions on the data.

The other important part of the satellite is propulsion sub system. Propulsion subsystem is responsible to keep the satellite in its orbit. Whenever the satellite deviates from its original orbit, the rocket fuel in the Satellite’s Propulsion subsystem propels the rocket to come in the correct orbit. This is the reason, why satellites have an average life of 8 – 10 years because the amount of rocket fuel isn’t too much to support for ever.