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Ground-speed Doppler radar for vehicles

  • US 4,354,191 A
  • Filed: 07/14/1980
  • Issued: 10/12/1982
  • Est. Priority Date: 07/27/1979
  • Status: Expired due to Term
First Claim
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1. In a Doppler radar system wherein the speed of an object is detected from a frequency shift of microwaves emitted from an antenna carried by the object and reflected from a stationary surface;

  • the improvement comprising a detecting circuit which detects a differential factor of the frequency shift, a threshold circuit which discriminates whether or not the output of said detecting circuit lies within a certain range of values, and a control circuit which varies the frequency of the microwaves emitted from the antenna on the basis of an output of said threshold circuit indicating that the output of said detecting circuit lies within said certain range of values.

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