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System and Related Circuits and Methods for Detecting and Locating Cellular Telephone Use Within a Geographical Area or Facility

  • US 20120088490A1
  • Filed: 12/19/2011
  • Published: 04/12/2012
  • Est. Priority Date: 10/17/2006
  • Status: Active Grant
First Claim
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1. A system for locating a communication device, comprising:

  • a plurality of receiver devices at respective locations within a region, wherein;

    in a first operating mode, the receiver devices are configured to scan a frequency band to search for a signal of interest within the region, at least some of the receiver devices being configured to switch to a second operating mode in response to at least one of the receiver devices detecting the signal of interest at a frequency within the frequency band; and

    in the second operating mode, the at least some of the receiver devices are configured to tune to the frequency of the signal of interest detected in the first operating mode to measure signal levels at the respective locations within the region; and

    a processor in communication with the receiver devices and configured to determine a location of a communication device emitting the signal of interest from the signal levels measured by the at least some of the receiver devices in the second operating mode.

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