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Complementary-sequence pulse radar with matched filtering and Doppler tolerant sidelobe suppression preceding Doppler filtering

  • US 5,440,311 A
  • Filed: 08/06/1993
  • Issued: 08/08/1995
  • Est. Priority Date: 08/06/1993
  • 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 plurality of pulse sets, each consisting of a predetermined plurality of pulses, said pulses of said sets being dispersed in time pursuant to predetermined phase codes, said pulses of said sets being, in combination, selected mutually complementary in a manner such that, after pulse compression and summation of said pulses, range sidelobes cancel and main range lobes add;

    receiving echoes of said pulses reflected from said anomaly to produce received range signals extending over a spectrum spaced about a plurality of predetermined frequencies, which predetermined frequencies represent various target velocities, said received signals being encoded with one of said phase codes;

    at each of said predetermined frequencies, matched filtering said received signals with one of said phase codes to produce compressed range pulses in which the main range lobes are of the same sense, and in which the range sidelobes cancel, and the spectrum of which includes significant energy at adjacent ones of said predetermined frequencies;

    summing said compressed range pulses to produce compressed range signals in which said range sidelobes are suppressed, and in which the spectrum includes significant energy at adjacent ones of said predetermined frequencies; and

    Doppler filtering said compressed range signal pulse sets into said plurality of predetermined frequencies to produce a sequence of range values at each of said predetermined frequencies, with reduced energy at said adjacent ones of said predetermined frequencies.

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