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Trajectory-based location determination

  • US 8,792,903 B2
  • Filed: 01/18/2010
  • Issued: 07/29/2014
  • Est. Priority Date: 06/30/2009
  • Status: Active Grant
First Claim
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1. A method comprising:

  • estimating a three dimensional trajectory of motion of a mobile device based at least in part on three dimensional sensor measurements performed by at least one sensor at said mobile device; and

    estimating, by the mobile device, a location of said mobile device based at least in part on a comparison of said estimated three dimensional trajectory with one or more predetermined candidate three dimensional trajectories stored at said mobile device, wherein estimating the location of said mobile device includes;

    obtaining externally-sourced (ES) position information for said mobile device before the mobile device enters an unfavorable radio-frequency (RF) environment;

    using said ES position information in the unfavorable RF environment to reduce a number of said one or more predetermined candidate three dimensional trajectories; and

    storing said ES position information during at least a portion of time when said mobile device is located where said ES position information is not available.

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