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Mobile location method for WLAN-type systems

  • US 7,664,511 B2
  • Filed: 12/12/2005
  • Issued: 02/16/2010
  • Est. Priority Date: 12/12/2005
  • Status: Expired due to Fees
First Claim
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1. A method comprising:

  • providing an estimate of a mobile location of a wireless node, point or terminal in a wireless local area network or other suitable network, the estimate being based at least partly on a correlation of a radio frequency signal strength measurement and a grid point in a signal strength database or radio map;

    the signal strength database or radio map being built using a signal strength fingerprint algorithm that includes recording grid positions and signal strength measurements;

    a data structure entry for each grid point being based at least partly on an identification number for each grid point, an estimated received information at a respective grid point, a physical location of the respective grid point, and received signal strength information from a respective transmission of an access point at the respective grid point; and

    the signal strength fingerprint algorithm including;

    placing access points in the wireless local area network or other suitable network and recording their coordinates;

    taking signal strengths measurements in areas of interest in the wireless local area network or other suitable network;

    applying a linear regression method to estimate propagation channels;

    estimating propagation channels at each grid point; and

    processing the results to form the signal strength database or radio map.

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