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Dual frequency band radar detector

  • US 4,626,857 A
  • Filed: 06/15/1983
  • Issued: 12/02/1986
  • Est. Priority Date: 06/15/1983
  • Status: Expired due to Term
First Claim
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1. Apparatus for detecting the presence of radar signals occurring within either of a first or a second range of frequencies comprising:

  • antenna means for receiving radar signals including radar signals occurring within said first and second range of frequencies;

    signal generating means for producing at least one pilot signal at a predetermined non-varying audio frequency;

    means for frequency modulating said received radar signals with said at least one pilot signal;

    means for isolating ones of the modulated signals produced in response to received signals in said first range of frequencies or in said second range of frequencies;

    frequency demodulating means coupled with said isolating means for detecting said at least one pilot signal; and

    control means responsive to said detected pilot signal for producing a control output signal;

    whereby the presence of said control output signal indicates the reception of said radar signals occurring within at least one of said first and second range of frequencies;

    wherein said control means comprises;

    band-pass filter means coupled to said demodulating for passing signals in a predetermined frequency band including the predetermined frequency of said at least one pilot signal; and

    phase comparator means coupled to said band-pass filter means and to said pilot signal producing means for producing said control output signal when the detected pilot signal is substantially the same frequency as and substantially in phase with at least one produced pilot signal.

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