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Pulsed doppler moving target detector

  • US 4,210,912 A
  • Filed: 03/16/1978
  • Issued: 07/01/1980
  • Est. Priority Date: 03/16/1978
  • Status: Expired due to Term
First Claim
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1. A pulsed doppler system for detecting a moving target wherein pulses of energy are reflected from the target in response to sequential pulse energization by a common predetermined carrier frequency of plural radiation transducers with patterns covering differing spatial regions, the reflected pulses having a carrier frequency that is shifted by the target relative to the predetermined carrier frequency of pulses incident on the target, comprising a plurality of signal processing channels, one for each of the transducers, each of said channels being responsive to reflected energy from the target transduced by the transducer associated with the channel, said channels being activated in synchronism with the sequentially energized transducers so that each channel is responsive to the reflected energy at differing times, each of said channels including filter means for passing a replica of the shifted carrier frequency to the exclusion of the carrier frequency energizing the transducer associated with the channel, means for deriving a signal indicative of the amplitude of the replica passed by the filter means;

  • and means responsive to the signals derived from the plural channels for indicating the presence of the target.

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