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Wireless terminal positioning method and apparatus

  • US 6,694,142 B1
  • Filed: 07/21/2000
  • Issued: 02/17/2004
  • Est. Priority Date: 12/21/1999
  • Status: Expired due to Fees
First Claim
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1. A wireless terminal position measuring method for estimating the position of a terminal using signals sent from at least three base stations accommodated by a cellular communication system, comprising:

  • a first step of selecting three base stations arbitrarily and estimating the position of the terminal according to the triangulation method;

    a second step of selecting estimated positions whose estimation error satisfies a predetermined condition from among a plurality of estimated positions calculated relative to various combinations of base stations in the first step; and

    a third step of calculating a spatial average of the selected estimated positions, wherein in said second step, said estimated positions are selected by judging whether the sum of three unit vectors, which are originated from each of the estimated positions towards three base stations, has a length that is equal to or smaller than a certain length.

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