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Complementary-sequence pulse radar with matched filtering following doppler filtering

  • US 5,151,702 A
  • Filed: 07/22/1991
  • Issued: 09/29/1992
  • Est. Priority Date: 07/22/1991
  • Status: Expired due to Fees
First Claim
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1. A method for detecting anomalies, comprising the steps of:

  • transmitting toward an anomaly a first pulse set consisting of a predetermined plurality of first pulses, said pulses of said first set being dispersed in time pursuant to a predetermined phase code;

    transmitting toward said anomaly a second pulse set consisting of said predetermined plurality of second pulses, said pulses of said second set being dispersed in time pursuant to a second phase code selected to be complementary to said predetermined phase code in a manner such that, after pulse compression of said first and second pulses, the resulting range sidelobes are substantially equal in amplitude and opposite in sign;

    receiving echoes of said first and second pulses reflected from said anomaly to produce received first and second pulse sets;

    Doppler filtering said received first and second pulse sets into a plurality of frequency components to produce a sequence of range values for each frequency component, each of said sequence of range values including said first and second code sequences;

    for each said frequency components, matched filtering each of said first and second code sequences of range values to produce first and second compressed pulses;

    summing said first and second compressed pulses; and

    after said Doppler filtering step, converting at least some of said plurality of frequency components to a common frequency.

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