Method and apparatus for determining the speed and location of a vehicle

  • US 6,266,627 B1
  • Filed: 07/16/1999
  • Issued: 07/24/2001
  • Est. Priority Date: 04/01/1996
  • Status: Expired due to Term
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First Claim
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1. A method for measuring the speed of a vehicle comprising the steps oftransmitting a wave beam directed at the vehicle, receiving a part of the wave beam reflected by the vehicle, comparing the reflected beam part with the transmitted wave beam, deriving from this comparison both the speed and the position of the vehicle, comparing the measured speed with a maximum allowed speed, and generating a warning signal when a speeding offense is determined, wherein the position of the vehicle is determined from a time lag detected during the comparison between the moment of transmitting and the moment of receiving the reflected beam part, and the speed of the vehicle is derived when the position of the vehicle is determined to be within a desired traffic lane to correspond to a defined time that is compared within a measuring window.

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