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Accuracy and performance of the hybrid positioning system

  • US 10,114,123 B2
  • Filed: 01/27/2014
  • Issued: 10/30/2018
  • Est. Priority Date: 09/29/2009
  • Status: Active Grant
First Claim
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1. A method for determining a location of a mobile device, comprising:

  • determining an initial location estimate of the mobile device using a wireless local area network positioning system (WPS) that processes signals from access points in range of the mobile device and calculates the initial location estimate from characteristics of the signals;

    calculating a region around the initial location estimate;

    receiving, at a satellite positioning system (SPS) receiver of the mobile device, signals from a set of satellites of a SPS;

    based on the received signals, determining, by the mobile device, a receiver clock bias for at least two satellites of the set of satellites at each of a plurality of points within the region and calculating therefrom a variation in receiver clock bias at each of the plurality of points within the region;

    using the variation in receiver clock bias to refine an SPS estimated location of the mobile device; and

    reporting a final location estimate of the mobile device based on the SPS estimated location.

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