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POSITION DETERMINATION USING A WIRELESS SIGNAL

  • US 20170374518A1
  • Filed: 09/07/2017
  • Published: 12/28/2017
  • Est. Priority Date: 11/18/2009
  • Status: Abandoned Application
First Claim
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1. A method comprising:

  • measuring a first round trip time (“

    RTT”

    ) for a first wireless signal received from an access point at a first mobile station position;

    calculating a first RTT-based distance between a position of the access point and the first mobile station position based on the first RTT;

    calculating a dead reckoning transition distance based on motion sensor data, the dead reckoning transition distance indicating a distance between the first mobile station position and a second mobile station position;

    calculating a wireless signal transition distance based on the first RTT-based distance and a second RTT-based distance calculated between the position of the access point and the second mobile station position, the second RTT-based distance calculated based on a second RTT measured for a second wireless signal received at the second mobile station position from the access point; and

    computing an uncertainty associated with one, or both, of the first RTT-based distance between the position of the access point and the first mobile station position and the second RTT-based distance between the position of the access point and the second mobile station position, wherein the uncertainty is computed based on the dead reckoning transition distance and the wireless signal transition distance.

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