Correlator having spurious signal cancellation circuitry

Details Correlator having spurious signal cancellation circuitry Correlator having spurious signal cancellation circuitry

1985-05-24

1987-09-22

Harkcom, Gary V.

Boots, shoes, and leggings

364604, G06G 719

Patent

active

046959726

ABSTRACT:
A correlator comprises a mixing stage receiving a low level signal to be correlated and a 500 KHz square wave. The output from the mixer comprises the low level signal coupled with the 500 KHz square wave signal. This output signal is fed to a multiplier for multiplying with the high level signal to be correlated. The output from this stage is fed via ac coupling to a double balanced mixer also receiving the 500 KHz square wave signal. This stage operates to decouple the square wave signal from the input to that stage to produce a dc output signal. In this output signal the effects of the square wave signal on the correlation itself have been cancelled whereas any spurious signals from within the correlator have in effect been multiplied by negative or positive values. Thus, subsequent integration of the dc output signal produces an eventual correlation output wherein the effects of the spurious signals have been substantially reduced by cancellation.

REFERENCES:
patent: 3199106 (1965-08-01), Karr
patent: 3416081 (1968-12-01), Gutleber
patent: 3700876 (1972-10-01), Gray
patent: 3961172 (1976-06-01), Hutcheon
patent: 4115865 (1978-09-01), Beauvais et al.
patent: 4224679 (1980-09-01), Nossen et al.
patent: 4283767 (1981-08-01), Rountree
patent: 4363129 (1982-12-01), Cohn et al.
patent: 4449193 (1984-05-01), Tournois

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