Satellite Communication

Therefore after considerable research and development efforts within the next few years in the development of space qualified electronics, the active repeaters were discovered. The first of Newton's laws, which was a logical extension of earlier work by Johannes Kepler, proposed that every bit of matter in the universe attracts every other bit of matter with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between the two bits. Very soon after Newton's laws were published, people realized that in principle it should be possible to launch an artificial satellite which would orbit the earth just as the moon does. A simple calculation, however, using the equations which we developed above, will show that an artificial satellite, orbiting near the surface of the earth (R = 4000 miles) will have a period of approximately 90 minutes.

A satellite system consists of a part of space which serves a specific part of ground. The characteristics of each part depend on whether the system is for fixed mobile or direct broadcast applications. Earth station in a network transmit radio frequency (RF) signals to the operational satellite is the main element of a satellite communication system. The received signals are processed and then translated into another