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Doppler signal frequency converter

  • US 4,780,837 A
  • Filed: 06/19/1985
  • Issued: 10/25/1988
  • Est. Priority Date: 06/23/1984
  • Status: Expired due to Term
First Claim
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1. A Doppler signal frequency converter comprising a plurality of complex signal converters in which a Doppler signal obtained by picking up and amplifying the reflection of a periodic pulse modulated wave beamed at a moving object at periods which are integer multiples of a repetition period is mixed with a complex reference signal and demodulated to convert the Doppler signal to an output complex signal, a delay line which delays an input complex signal by a period which is an integer multiple of the repetition period, and a complex multiplier which computes the complex products and the conjugate products of the input complex signal which has been delayed by the delay line and the output complex signal, whereby the Doppler signal obtained from the object is converted to Doppler signals of frequencies which enable a wide range of velocity components to be detected.

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