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Remote terminal location algorithm

  • US 6,756,940 B2
  • Filed: 12/18/2001
  • Issued: 06/29/2004
  • Est. Priority Date: 12/18/2001
  • Status: Expired due to Fees
First Claim
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1. A method of locating a mobile device comprising:

  • obtaining a plurality of time-of-arrival measurements for communications between the mobile device and each of at least six fixed stations;

    distributing the plurality of time-of-arrival measurements into a low-quality set of time-of-arrival measurements and a high-quality set of time-of-arrival measurements based on a first criterion;

    forming a plurality of subsets from the time-of-arrival measurements in the low-quality set;

    obtaining a plurality of preliminary location estimates of the mobile device'"'"'s location by computing, for each of the plurality of subsets formed from the low-quality set, a preliminary location estimate of the mobile device'"'"'s location based on all time-of-arrival measurements contained in the respective subset, all time-of-arrival measurements contained in the high-quality set, and the locations of the fixed stations; and

    merging the plurality of preliminary location estimates into a final estimate of the mobile device'"'"'s location.

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