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Frequency domain processing of Doppler signals in a traffic monitoring system

  • US 5,912,822 A
  • Filed: 10/15/1996
  • Issued: 06/15/1999
  • Est. Priority Date: 06/01/1994
  • Status: Expired due to Term
First Claim
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1. A method of determining a speed of a moving vehicle, said method comprising the steps of:

  • (a) operating a Doppler radar transceiver to generate a Doppler signal responsive to said speed of said moving vehicle;

    (b) operating a digital computer to transform said Doppler signal into a frequency domain signal, and to determine said speed of said moving vehicle by computing a statistic of said frequency domain signal, wherein the frequency domain signal indicates a distribution of energy of the Doppler signal as a function of frequency.

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