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ESTIMATION OF SPEED AND DIRECTION OF TRAVEL IN A WLAN POSITIONING SYSTEM USING MULTIPLE POSITION ESTIMATIONS

  • US 20090252138A1
  • Filed: 06/18/2009
  • Published: 10/08/2009
  • Est. Priority Date: 05/08/2006
  • Status: Active Grant
First Claim
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1. A method used for facilitating the determination of a direction of travel of a Wi-Fi enabled device within a location-based services system having a reference database of Wi-Fi access points in a target area, each Wi-Fi access point in the target area positioned at a corresponding geographical location, the method comprising:

  • the Wi-Fi enabled device receiving signals transmitted by Wi-Fi access points in range of the Wi-Fi enabled device;

    accessing the reference database to retrieve the corresponding geographical locations of the identified Wi-Fi access points;

    using the geographical locations of the identified Wi-Fi access points to estimate a sequence of positions of the Wi-Fi enabled device occurring during a window of time, the sequence having a first position;

    calculating a plurality of intermediate directions of travel of the Wi-Fi enabled device based on the first position and the later positions of the sequence, each direction calculation using a different later position for each individual calculation; and

    calculating a direction of travel of the Wi-Fi enabled device based on the average of the plurality of intermediate directions of travel.

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