Quadrature correlation phase reversal pulse detector

Details Quadrature correlation phase reversal pulse detector Quadrature correlation phase reversal pulse detector

1977-12-07

1979-08-07

Gruber, Felix D.

Boots, shoes, and leggings

179 84VF, 340 6R, 343100CL, 364728, G01R 2302, H04M 150, G06F 1534

Patent

active

041640365

ABSTRACT:
Apparatus and a method are disclosed for detecting a tone pulse of known carrier frequency having a carrier phase reversal at a predetermined time by correlating a clipped version of the tone pulse signal with each of quadrature related components of a rectangular wave reference signal. Correlation is accomplished by multiplying the clipped signal with the reference signal components and sampling the two resultant product signals. Samples of each product signal are shifted through a delay register having sufficient capacity to contain samples corresponding to a complete pulse, and having an intermediate tap arranged to correspond with the timing of the phase reversal. Concurrent input and output samples of each delay register and an inverted and doubled version of the signal at its intermediate tap are combined and integrated to provide a pair of correlation signals which are rectified and summed to produce an autocorrelation signal.

REFERENCES:
patent: 3546440 (1970-12-01), Fawcett, Jr.
patent: 3939463 (1976-02-01), Kelly et al.
patent: 3978445 (1976-08-01), Gravett
patent: 4017862 (1977-04-01), Wild
patent: 4051350 (1977-09-01), Parent
patent: 4100378 (1978-07-01), Claasen et al.
Claasen et al.: A Digital Receiver for Tone Detection Applications. IEEE Trans. on Communications, vol. COM-24, No. 12, Dec. 1976, pp. 1291/1300.

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