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

  • US 20050261004A1
  • Filed: 05/18/2004
  • Published: 11/24/2005
  • Est. Priority Date: 05/18/2004
  • Status: Active Grant
First Claim
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1. A method for estimating the location of a wireless node relative to a plurality of radio receivers operative to detect the strength of RF signals, wherein a RF coverage map, corresponding to each of the radio receivers, characterizes the signal strength values for locations in a physical region out to a threshold signal strength level, comprising collecting signal strength values, detected at a plurality of radio receivers, corresponding to signals transmitted by a wireless node;

  • defining a search region based on the intersection of the RF coverage maps corresponding to radio receivers that detected signals transmitted by the wireless node;

    computing, 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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