Method and apparatus for locating and tracking a QPSK carrier
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United States of America Patent
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-
Dec 16, 1997
Grant Date -
N/A
app pub date -
Apr 21, 1995
filing date -
Dec 3, 1993
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In a receiver for receiving a carrier modulated with data, there is provided a system for locating and tracking said carrier. The carrier is located by sweeping a frequency range containing said carrier. False lockup are inherent when a wide frequency sweep demodulator attempts to lock onto a carrier, and the system recognizes such lockups by monitoring data from a Viterbi error correction circuit. On false lockup, the system breaks the lockup and continues the sweep until the true data carrier is located and tracked.
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