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Direction of travel motion sensor

  • US 7,777,624 B2
  • Filed: 09/26/2007
  • Issued: 08/17/2010
  • Est. Priority Date: 09/26/2007
  • Status: Active Grant
First Claim
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1. A method of sensing the direction of travel of an intruder in a protected area, said method comprising the steps of:

  • a microwave (MW) motion detector transmitting a microwave signal toward a protected area;

    the microwave (MW) motion detector receiving a MW Doppler signal reflected from a target in the protected area;

    comparing the received MW Doppler signal to a predetermined threshold, wherein, if the MW Doppler signal is less than the threshold signal, storing the MW Doppler signal in non-volatile memory; and

    averaging all MW Doppler signals stored in said non-volatile memory and generating a moving average as new MW Doppler signals are received, wherein, if the moving average is increasing or decreasing generating an alarm indicating said intruder in said protected area.

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