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Wireless node location mechanism featuring definition of search region to optimize location computation

  • US 8,204,512 B2
  • Filed: 07/29/2008
  • Issued: 06/19/2012
  • Est. Priority Date: 05/18/2004
  • Status: Active Grant
First Claim
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1. A method comprisingcollecting signal strength values, detected at a plurality of radio receivers, corresponding to Radio Frequency (RF) signals transmitted by a wireless node;

  • accessing a plurality of RF coverage maps, wherein each RF coverage map corresponds to a radio receiver of the plurality of radio receivers and characterizes signal strength values for locations in a physical region out to a threshold signal strength level;

    defining a search region to include only a region that is covered by all of the plurality of RF coverage maps; and

    searching for, confined within the defined search region, the estimated location of the wireless node based on the collected signal strength values and the RF coverage maps corresponding to the plurality of radio receivers.

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