Adaptive recursive frequency offset tracking system

Details Adaptive recursive frequency offset tracking system Adaptive recursive frequency offset tracking system

1981-12-07

1985-05-28

Bookbinder, Marc E.

Pulse or digital communications

Repeaters

Testing

375 81, 329137, H04L 2716

Patent

active

045204934

ABSTRACT:
An adaptive, recursive frequency offset tracking system for effectively acquiring and tracking coherent as well as noncoherent electromagnetic data signals transmitted with or without countermeasure protection. The invention includes circuitry for eliminating the carrier frequency and generating complex samples of the baseband signal. The invention compares the phase of a sample to that of the previous sample to extract signals representing the phase difference between the two. The signals representing the phase difference are then converted to phasor signals and filtered to eliminate any noise component. The phase difference signals are derived from the phasor signals and accumulated to derive signals representing the frequency offset of the received data signal. The frequency offset signal is then provided to a phase shifter to correct for the effect of Doppler shift on the received data signal.

REFERENCES:
patent: 3919651 (1975-11-01), Le Mouel
patent: 4146841 (1979-03-01), McRae
patent: 4177427 (1979-12-01), Shores
patent: 4320526 (1982-03-01), Gitlin
patent: 4328587 (1982-05-01), Mizuno et al.
W. C. Lindsey, "Synchronization Systems In Communication And Control", Inglewood Clifs, N.J., Prentice-Hall, pp. 478-480, 1972.

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