Satellite communications system including automatic frequency co

Details Satellite communications system including automatic frequency co Satellite communications system including automatic frequency co

1996-05-20

1999-03-02

Chin, Wellington

Telecommunications

Transmitter and receiver at separate stations

With control signal

455 132, 455 676, 455265, 342402, 342405, 342418, H04B 112

Patent

active

058783300

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.

REFERENCES:
patent: 3450842 (1969-06-01), Lipke
patent: 4001690 (1977-01-01), Mack et al.
patent: 4466130 (1984-08-01), Sewerinson
patent: 4479256 (1984-10-01), Sewerinson

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