Location determination and location tracking in wireless networks

CAFC
  • US 7,359,718 B2
  • Filed: 04/30/2004
  • Issued: 04/15/2008
  • Est. Priority Date: 04/30/2004
  • Status: Active Grant
First Claim
Patent Images

1. A system comprising:

  • one or more wireless network access nodes, said one or more wireless network access nodes providing a plurality of antenna patterns;

    calculation logic for determining receive signal strength differences with respect to a signal as received by said one or more wireless access nodes using said plurality of antenna patterns, said signal being transmitted from a location unknown to said system;

    a radio map providing location estimates associated with use of said plurality of antenna patterns; and

    calculation logic for improving said radio map using said receive signal strength differences determined by said calculation logic for determining receive signal strength differences, wherein said improving said radio map comprises using a series of receive signal strength differences determinations to iteratively improve said radio map.

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