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Method and apparatus for covariance matrix estimation in a weighted least-squares location solution

  • US 5,884,215 A
  • Filed: 01/31/1997
  • Issued: 03/16/1999
  • Est. Priority Date: 01/31/1997
  • Status: Expired due to Term
First Claim
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1. In a wireless communication system comprising a fixed infrastructure in wireless communication with a plurality of mobile units, the fixed infrastructure comprising a location processor, a method for the location processor to estimate a location of a mobile unit of the plurality of mobile units, the method comprising steps of:

  • determining M channel quality metrics corresponding to the mobile unit, wherein M≧

    3;

    determining M time of arrival variances based on the channel quality metrics;

    determining M-1 time of arrival differential variances based on the time of arrival variances; and

    determining a weighted least squares solution using the time of arrival differential variances to estimate the location of the mobile unit.

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