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Qualifying coarse position injection in position determination systems

  • US 8,259,010 B2
  • Filed: 05/24/2010
  • Issued: 09/04/2012
  • Est. Priority Date: 10/14/2009
  • Status: Active Grant
First Claim
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1. A method for position location in a position determination system (PDS), said method comprising:

  • receiving a request to determine a position of a PDS receiver;

    responsive to said request, retrieving location data from a plurality of wireless devices in proximity to said PDS receiver;

    evaluating reliability of a previously stored common seed location, corresponding to a previously determined satellite positioning system (SPS) location for the PDS receiver, by comparing said retrieved location data to the previously stored common seed location to determine location consistency of each of said retrieved location data from the plurality of wireless devices with the previously stored common seed location, the previously stored common seed location representative of an approximate location of the PDS receiver for use in determining a satellite search window for determining the position of the PDS receiver; and

    responsive to determining said retrieved location data from the plurality of wireless devices to be consistent with said previously stored common seed location of the approximate location of the PDS receiver, injecting said previously stored common seed location of the approximate location of the PDS receiver into a positioning process of said PDS receiver to determine the position of the PDS receiver.

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