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Methods of and circuits for suppressing doppler radar clutter

  • US 4,459,592 A
  • Filed: 06/24/1981
  • Issued: 07/10/1984
  • Est. Priority Date: 10/31/1980
  • Status: Expired due to Term
First Claim
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1. A radar clutter suppressor comprising:

  • receiving means for receiving radar echoes of radar transmitter waves and for providing a received signal with doppler frequency components in response to said radar echoes;

    signal processing means having doppler processor means for frequency filtering the received signal to selectively attenuate the doppler frequency components of the received signal and provide at least one filtered signal in response to the received signal;

    amplitude comparison means for comparing the at least one filtered signal and the received signal and for providing a comparator output signal of a first level only when a ratio of the strengths of the at least one filtered signal and the received signal is within a predetermined range of values and of a second level whenever the ratio is outside the predetermined range of values; and

    gating means responsive to the comparator output signal for selectively passing a radar output signal constituting a clutter suppressed radar output only when the ratio of the at least one filtered signal to the received signal exceeds a predetermined value.

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