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Police traffic radar using FFT processing to find fastest target

DC
  • US 5,691,724 A
  • Filed: 08/09/1996
  • Issued: 11/25/1997
  • Est. Priority Date: 02/10/1995
  • Status: Expired due to Term
First Claim
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1. A method of measuring the speed of moving targets in police traffic surveillance radar unit having at least two display windows, comprising the steps of:

  • (1) transmitting a radar signal toward one or more moving targets;

    (2) receiving a spectrum of radar return signals from moving and stationary objects, said stationary objects being defined as those objects which have no relative velocity with respect to said police traffic surveillance radar unit if said radar unit is not moving;

    (3) calculating the speed of a moving target which has the strongest radar return signal which is not the radar return signal indicative of the speed that the police traffic surveillance radar unit itself is moving, said strongest radar return signal being found in said spectrum of radar return signals;

    (4) calculating the speed of at least one of the fastest moving targets having a radar return signal in said spectrum of radar return signals; and

    (5) displaying in a first of said at least two display windows the speed of the moving target having said strongest radar return signal which is not the radar return signal indicative of the speed that the police traffic surveillance radar unit itself is moving, and selectively displaying the speed of one of the fastest moving targets determined in step (4) above.

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