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Positioning systems for wireless networks

  • US 9,282,471 B2
  • Filed: 03/15/2013
  • Issued: 03/08/2016
  • Est. Priority Date: 03/21/2012
  • Status: Active Grant
First Claim
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1. A method of computing positioning of a mobile device in a wireless network, the method comprising:

  • receiving a message sent from a mobile device at each of a set of network nodes at corresponding network node locations;

    exchanging pings among the network nodes, including assigning local clock values to pings upon sending and receiving the pings;

    from the local clock values exchanged among the network nodes, determining clock differences among the network nodes;

    from the clock differences, determining path delay between the network nodes;

    from data provided by the network nodes about receipt of the message and the path delays, determining pseudo range estimates between the mobile device and the network nodes; and

    determining location of the mobile device by evaluating differences between candidate positions of the mobile device and the pseudo range estimates, and selecting a candidate location with minimum error criteria as the location of the mobile device;

    wherein multipath error is estimated for the network nodes and removed from the pseudo range estimates prior to determining the location, and determining location comprises evaluating variation of a differential between ranges of candidate positions of the mobile device and the pseudo range estimates, and selecting a location where the variation of the differential satisfies predetermined criteria.

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