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Wireless location using signal direction and time difference of arrival

  • US 20030146871A1
  • Filed: 09/30/2002
  • Published: 08/07/2003
  • Est. Priority Date: 11/24/1998
  • Status: Abandoned Application
First Claim
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1. A method for locating a wireless mobile station using wireless signal measurements obtained from transmissions between said mobile station and a plurality of base stations capable of wirelessly detecting said mobile station, comprising:

  • providing first and second mobile station location estimators, wherein said location estimators provide location estimates of said mobile station when said location estimators receive wireless signal measurements obtained from transmissions between said mobile station and the base stations, wherein;

    (A) said first location estimator is capable of performing one or more of the techniques;

    (a) a triangulation technique to determine, for each of three or more of the base stations, a distance between the mobile station and the base station using the wireless signal measurements;

    (b) a learning technique, wherein said learning technique determines an association for associating;

    the wireless signal measurements, and data indicative of a location for the mobile station, wherein said association is determined by a training process using a plurality of data pairs, each said pair including;

    first information indicative of a location of some mobile station, and second information from wireless signal measurements between said some mobile station and one or more of the base stations when said some mobile station is at the location;

    (c) a stochastic technique, wherein each said stochastic technique uses a statistical correlation for correlating;

    the wireless signal measurements, and data indicative of a location for the mobile station, wherein said correlation is used for determining a probability that the mobile station is within an area, and (B) for at least a particular one of said techniques performed by said first location estimator, said second location estimator does not perform said particular technique;

    first supplying said first location estimator with first data from the wireless signal measurements;

    first generating, by said first location estimator, first location related information having at least a first estimate of the mobile station'"'"'s location;

    second supplying said second location estimator with second data from the wireless signal measurements;

    second generating, by said second location estimator, second location related information having at least a second estimate of the mobile station'"'"'s location;

    determining a resulting location estimate of the mobile station using;

    (a) a first value obtained from said first location related information, and (b) a second value obtained from said second location related information.

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