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Geolocation estimation method for CDMA terminals based on pilot strength measurements

  • US 6,263,208 B1
  • Filed: 05/28/1999
  • Issued: 07/17/2001
  • Est. Priority Date: 05/28/1999
  • Status: Expired due to Term
First Claim
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1. A method of estimating the location of a mobile communications unit in a wireless communications service area, comprising the steps of:

  • (a) receiving signal strength measurements transmitted from a mobile unit located in the service area, said signal strength measurements being specific to the location wherein the mobile unit is presently located;

    (b) computing a location probability distribution using Bayes theorem of the mobile unit within the service area in response to the received signal strength measurements using analytical results derived from a model that accounts for distance loss, shadow fading, fast fading and measurement errors the service area being defined in terms of a set of stored parameters that are associated with each of said plurality of locations in the service area; and

    (c) generating an output indicative of the probability that the mobile unit is located at each of said plurality of locations in the service area.

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