Noise-immune signal processing circuit for pulsed radars

Communications: radio wave antennas – Antennas – Balanced doublet - centerfed

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G01S 944

Patent

active

041174836

ABSTRACT:
In a pulsed radar utilizing the phase shift of the intermediate frequency signal of a return echo with the speed of a moving object relative to a given point, a signal processing circuit includes a pair of comparators which respond to the intermediate frequency signal by generating first and second output signals when the input signal reaches positive and negative threshold levels, respectively. The comparator outputs are connected to a bistable device which periodically changes its binary state in response to the phase shift of the intermediate frequency signal. When the bistable device changes its state, the positive and negative threshold levels are varied in a manner to ensure that the bistable device retains its state even though noise is introduced into the intermediate frequency signal.

REFERENCES:
patent: 2911641 (1959-11-01), Kohler
patent: 3761925 (1973-09-01), Bollard
patent: 3787854 (1974-01-01), Friedman et al.

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