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Determining the position of a mobile device using the characteristics of received signals and a reference database

  • US 8,314,736 B2
  • Filed: 08/06/2010
  • Issued: 11/20/2012
  • Est. Priority Date: 03/31/2008
  • Status: Expired due to Fees
First Claim
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1. A method of determining a location of a mobile device, the method comprising:

  • receiving a first plurality of signals with a known transmission pattern at the mobile device from a set of transmitters, the first plurality of signals comprising at least one multipath signal;

    computing a first set of parameters from the first plurality of signals using the known transmission pattern;

    retrieving, from a database, a second set of parameters computed from a second plurality of signals, the second plurality of signals comprising at least one multipath signal, each parameter in the second set of parameters associated with a location where a corresponding signal from the second plurality of signals was received, wherein each location associated with a parameter in the second set of parameters is identified by a set of coordinate values;

    for each particular location associated with a parameter in the second set of parameters;

    multiplying each parameter in the first set of parameters with each parameter in the second set of parameters that is associated with the particular location; and

    summing a result of each multiplication to determine a correlation coefficient corresponding to the particular location;

    normalizing each correlation coefficient; and

    determining the location of the mobile device by computing a set of coordinate values for the location of the mobile device, each coordinate value for the location of the mobile device computed as a weighted average of each normalized correlation coefficient multiplied by a coordinate value in the set of coordinate values corresponding to the second set of parameters.

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