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Estimating the location of a wireless terminal based on radio-frequency pattern matching and cooperative measurements

  • US 9,989,620 B1
  • Filed: 10/18/2016
  • Issued: 06/05/2018
  • Est. Priority Date: 08/08/2014
  • Status: Active Grant
First Claim
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1. A method comprising:

  • receiving, at a data processing system, a measurement of a first location-dependent trait of a first radio signal that is transmitted between a first base station and a first wireless terminal;

    receiving, at the data processing system, a measurement of a second location-dependent trait of a second radio signal that is transmitted between the first wireless terminal and a second wireless terminal that are at unknown locations;

    generating a first candidate estimate of a location of the first wireless terminal based on the measurement of the first location-dependent trait of the first radio signal, wherein the generating of the first candidate estimate of the location of the first wireless terminal comprises pattern matching the measurement of the first location-dependent trait of the first radio signal to a database that associates (1) locations and (2) predicted values of the first location-dependent trait of the first radio signal at each of those locations;

    generating a second candidate estimate of the location of the first wireless terminal based on the measurement of the first location-dependent trait of the first radio signal; and

    generating an improved estimate of the location of the first wireless terminal based on;

    (i) the first candidate estimate of the location of the first wireless terminal,(ii) the second candidate estimate of the location of the first wireless terminal, and(iii) the measurement of the second location-dependent trait of the second radio signal.

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