Satelite Communication Paper Presentation & Seminar PDF Download
Satelite Communication Paper Presentation & Seminar
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A satellite is any object that orbits another object. In popular usage, the term 'satellite' normally refers to an artificial satellite. A planet, or any other body, which finds itself at any distance from the sun with no "sideways" velocity will quickly fall without missing the sun. Only our sideways motion saves us.
The planet, which is at a larger distance, requires longer falling to where it would strike the sun. As a result, it takes a longer time to complete the ¼ trip around the sun, which is necessary to make a circular orbit. A satellite orbiting at an altitude of 22,300 miles would require exactly 24 hours to orbit the earth. Hence such an orbit is called "geosynchronous" or "geostationary." Both radio and television frequency signals can propagate directly from transmitter to receiver. Telstar's orbit was such that it could "see" Europe" and the US simultaneously during one part of its orbit. The downlink may either be to a select number of ground stations or it may be broadcast to everyone in a large area.
The amount of power, which a satellite transmitter needs to send out, depends a great deal on whether it is in low earth orbit or in geosynchronous orbit. One of the biggest differences between a low earth satellite and a geosynchronous satellite is in their antennas. Doubling the diameter of a reflector antenna (a big "dish") will reduce the area of the beam spot to one fourth of what it would be with a smaller reflector. We describe this in terms of the gain of the antenna. We say that transmitters are only 10 or 15% efficient. The ACTS concept involves a single, rather complicated, and expensive geosynchronous satellite. An alternative approach is to deploy a "constellation" of low earth orbiting satellites. It will be necessary to mass-produce communications satellites, so that they can turn out quickly and cheaply
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