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Estimating the location of a mobile unit based on the elimination of improbable locations

  • US 6,944,465 B2
  • Filed: 11/18/2002
  • Issued: 09/13/2005
  • Est. Priority Date: 09/22/1998
  • Status: Expired due to Term
First Claim
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1. A method for estimating the location of a mobile unit from a plurality of possible positions, said method comprising:

  • receiving an indication from said mobile unit that said mobile unit does not receive a first signal from a first transmitter;

    eliminating some of said plurality of possible positions from consideration based on the fact that said mobile unit did not receive said first signal from said first transmitter; and

    choosing as an estimate of said position of said mobile unit one of said plurality of possible positions not eliminated from consideration based on the fact that said mobile unit did not receive said first signal from said first transmitter.

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