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To use a satellite for communication relay or repeater purposes what type of orbit will be the best?

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To use a satellite for communication relay or repeater purposes what type of orbit will be the best?

(a) Circular orbit

(b) Elliptical orbit

(c) Geosynchronous orbit

(d) Triangular orbit

This question was posed to me at a job interview.

The above asked question is from Satellite Orbits topic in chapter Satellite Communication of Avionics

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The correct choice is (c) Geosynchronous orbit

Best explanation: The best solution is to launch a synchronous or geostationary satellite. In a geosynchronous earth orbit. Since the satellite remains apparently fixed, no special earth station tracking antennas are required. The antenna is simply pointed at the satellite and remains in a fixed position. With this arrangement, continuous communication is possible.

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