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System and method for improving infrared detector performance in dual detector system

  • US 7,679,509 B2
  • Filed: 03/07/2007
  • Issued: 03/16/2010
  • Est. Priority Date: 03/07/2007
  • Status: Active Grant
First Claim
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1. A system for improving false alarm immunity for a dual intrusion detector, the dual intrusion detector including at least one microwave sensor and at least one passive infrared sensor, the system comprising:

  • multiple range bins for classifying microwave signals, the multiple range bins comprising at least a long range bin and a mid range bin;

    a range determination, module for estimating a target range based on a state of each of the multiple range bins; and

    an infrared sensitivity determination mechanism for determining an optimal infrared sensor sensitivity level based on the estimated target range, wherein a target located within the long range bin and not within the mid range bin, and that transmits a signal having a frequency below a predetermined threshold, triggers an increase in infrared detector sensitivity level in order to detect slow moving intruders.

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