This question appears in Mumbai University > Satellite Communication and Network subject

Marks: 5 M

Year: May 2015

Tracking –

1. The satellite movement is tracked, and correction signals are sent to the satellite
2. This system is located at the earth station providing information on elevation and azimuth angles of the satellite
3. Tracking is important during the transfer and drift orbital phases of the satellite launch. Once it is on station, the position of a geostationary satellite tends to be shifted as a result of the various disturbing forces. Therefore, it is necessary to be able to track the satellite’s movement and send correction signals as required
4. Tracking beacons may be transmitted in the telemetry channel or by pilot carriers at frequencies in one of the main communication channels, or by special tracking antennas. Satellite range from the ground station is also required from time to time. This can be determined by measurement of the propagation delay of signals especially transmitted for ranging purposes.