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Long range police radar warning receiver

  • US 5,049,885 A
  • Filed: 07/27/1990
  • Issued: 09/17/1991
  • Est. Priority Date: 10/13/1989
  • Status: Expired due to Term
First Claim
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1. A police radar warning receiver comprising:

  • IF signal means for producing an IF sweep pattern as an oscillator signal is swept in frequency between a first frequency and a second frequency in response to mixing of received RF signals in at least one band of police radar signal frequencies with said swept oscillator signal;

    FM discriminator means responsive to IF signal means for producing an FM sweep pattern corresponding to FM demodulation of said IF sweep pattern as said IF sweep pattern is produced;

    sampler means for repeatedly sampling at sample intervals said FM sweep pattern as it is produced whereby to produce a series of digital sample words each associated with a respective sample interval;

    correlator means for correlating each digital sample word as it is produced with a plurality of proceeding said digital sample words and a complex correlator function whereby to provide a series of complex digital correlator words each associated with a respective sample interval;

    averager means for accumulating for each of at least a plurality of said sample intervals, an average of the complex digital correlator word produced each sweep and associated with a said sample interval over a plurality of sweeps of the oscillator signal whereby to produce a series of averager words each associated with a respective one of said plurality of sample intervals;

    alarm enable means responsive to said averager means for providing an alarm enable if, after a given sweep of the oscillator signal, an averager word meets at least a first criterion whereby to indicate receipt of a police radar signal.

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