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System and method using elliptical search area coverage in determining the location of a mobile terminal

  • US 5,930,717 A
  • Filed: 07/30/1997
  • Issued: 07/27/1999
  • Est. Priority Date: 07/30/1997
  • Status: Expired due to Term
First Claim
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1. A method for determining an elliptical position estimate of a mobile terminal communicating within a radiocommunication system said elliptical position estimate being an optimum are for locating the mobile terminal, said method comprising the steps of:

  • receiving, at a multiplicity of base stations, a signal transmitted by said mobile terminal;

    forwarding, by each of said multiplicity of base stations, said received signal and Automatic Location Information (ALI) data to a central processing center; and

    calculating, within said central processing center, said elliptical position estimate of said mobile terminal from said ALI data, said elliptical positional estimate being based on configuration of the base stations, the mobile terminal'"'"'s position, and the uncertainties of the raw measurements used by said ALI technique.

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