Satellite communications system including automatic frequency control
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United States of America Patent
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Mar 2, 1999
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N/A
app pub date -
May 20, 1996
filing date -
May 20, 1996
priority date (Note) -
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Abstract
An automatic frequency control system for use in satellite communications is provided that is pre-programmed with an initial acquisition Doppler offset frequency. The system includes a search mode for accurately determining the satellite's initial frequency translation error before the initiation of data transmission and also for determining the Doppler rate of change. The system further includes a tracking mode, in which the frequency variation is continuously monitored. Depending on the frequency characteristics of the transmission, the system is capable of re-entering the search mode to determine a new frequency translation error, if necessary.
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