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Doppler correlation radar providing coarse-range detection resolution

  • US 3,882,495 A
  • Filed: 06/11/1973
  • Issued: 05/06/1975
  • Est. Priority Date: 06/11/1973
  • Status: Expired due to Term
First Claim
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1. In a moving target correlation radar system of the type comprising means for transmitting a continuous carrier wave modulated with a predetermined encoded modulating signal, means for demodulating echo signals received from any moving target within a given range illuminated with said transmitted signal, means for generating a decoding signal, and doppler-frequency means including correlation decoding means for correlating said demodulated echo signals against said decoding signal to derive an output signal from said correlation decoding means which includes the doppler-frequency signature of any moving target then being detectEd;

  • the improvement wherein;

    said moving targets comprise a predetermined plurality of different target types each having a distinctive dopplerfrequency signature and a distinctive radar cross-section, and said decoding signal generating means includes means for applying to said correlation decoding means at least a selected one of a group of different predetermined decoding signals each of which has a format corresponding to a different target type, each of said respective formats of said different decoding signals only correlating with said demodulated echo signal over a different range subinterval of said given range with the range subinterval corresponding to a target type of relatively smaller radar cross-section being closer than the range subinterval corresponding to a target type of relatively larger radar cross section.

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