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Estimating the location of a wireless terminal based on signal path impairment

  • US 7,734,298 B2
  • Filed: 05/22/2006
  • Issued: 06/08/2010
  • Est. Priority Date: 09/22/1998
  • Status: Expired due to Term
First Claim
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1. A method comprising:

  • (1) receiving (i) a first measured pathloss for a signal that is processed by a wireless terminal at a first time T1 and (ii) a second measured pathloss for the signal at a second time T2, wherein the first time does not equal the second time;

    (2) estimating a first location of the wireless terminal at the second time based on (i) the first measured pathloss, (ii) the second measured pathloss, and (iii) an estimate of the probability that the wireless terminal at a second location at the first time T1 will still be at the second location at the second time T2;

    wherein (2) comprises;

    (2.1) comparing the first measured pathloss to;

    (i) a first expected pathloss of the signal when the wireless terminal is at a third location at the first time T1, and(ii) a second expected pathloss of the signal when the wireless terminal is at a fourth location at the first time T1; and

    (2.2) comparing the second measured pathloss to;

    (i) a first expected pathloss of the signal when the wireless terminal is at a fifth location at the second time T2, and(ii) a second expected pathloss of the signal when the wireless terminal is at a sixth location at the second time T2.

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