Simultaneous detection of time coincident signals in an adaptive

Details Simultaneous detection of time coincident signals in an adaptive Simultaneous detection of time coincident signals in an adaptive

1981-12-03

1985-04-23

Griffin, Robert L.

Pulse or digital communications

Spread spectrum

Direct sequence

343 7PL, 375 77, H03D 1300

Patent

active

045134286

ABSTRACT:
The performance of an adaptive digital doppler tracker having a sample data phase locked loop is improved by a circuit that detects and demodulates interfering signals. The tracker has a coherence sensor that provides signals indicating coherence and non-coherence conditions. An amplitude sensor generates a strong signal when interfering (time coincident) signals are received. The tracker includes both a coherent data detector and an SSB processor. An interference detector receives the outputs of the coherence sensor and the amplitude sensor and generates an SSB enable signal in response to the coincidence of a strong signal and a non-coherent condition signal. The SSB enable signal disables the coherent data detector and enables the SSB processor which detects both interfering signals.

REFERENCES:
patent: 4079329 (1978-03-01), England et al.
patent: 4135057 (1979-01-01), Bayless, Sr. et al.
patent: 4243941 (1981-01-01), Zdunek

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