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Positioning system and method

  • US 5,602,903 A
  • Filed: 09/28/1994
  • Issued: 02/11/1997
  • Est. Priority Date: 09/28/1994
  • Status: Expired due to Term
First Claim
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1. For use in a wireless communication system including a plurality of base stations each having a corresponding coverage area, a method for determining the position of a mobile unit, comprising:

  • for each of the base stations, determining in cooperation with a receiver, a plurality of RF measurements for the base station, for a predetermined plurality of distances and directions;

    for each of the base stations, modeling its determined RF measurements as a scaled contour shape having minimum and maximum boundaries which is capable of being projected on a Graphical Information System (GIS);

    determining RF measurements from neighboring base stations; and

    determining where the corresponding contours of the RF measurements from neighboring base stations intersect so as to define a bounding polygon area that describes the position of the mobile unit in terms of a minimum and maximum error estimate.

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