Quadrature correlation pulse detector

Details Quadrature correlation pulse detector Quadrature correlation pulse detector

1976-04-19

1977-07-26

Gruber, Felix D.

Registers

Transfer mechanism

Traveling pawl

325323, 329124, 343 77, G06F 1534, G01S 923

Patent

active

040385400

ABSTRACT:
Digital apparatus and a method are disclosed for detecting a tone pulse of known carrier frequency in a signal in which random noise is present by correlating a clipped version of the input signal with a square wave reference signal having a repetition rate equal to the carrier frequency. Correlation is accomplished by multiplying the clipped input signal with each of quadrature components of the square wave reference signal and sampling the product signals to provide binary sample trains which are supplied to a pair of shift register accumulators. Reversible counters and associated logic determine the differences in the numbers of samples of noncorresponding binary values in each of the shift registers, and provide counts which are added to produce a moving correlation signal which indicates presence of a tone pulse when it exceeds a predetermined correlation threshold.

REFERENCES:
patent: 3843931 (1974-10-01), Sarkilahti
patent: 3881101 (1975-04-01), Pederson et al.
patent: 3925732 (1975-12-01), Tanaka et al.
patent: 3927405 (1975-12-01), Poinsard et al.

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