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Positioning technique

  • US 20050197139A1
  • Filed: 01/07/2005
  • Published: 09/08/2005
  • Est. Priority Date: 07/10/2002
  • Status: Active Grant
First Claim
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1. A method for estimating a target device'"'"'s location in a wireless communication environment, the method comprising:

  • maintaining a probabilistic model for a plurality of sample points, each sample point comprising a sample location and an expected distribution of signal values at that sample point;

    making a sequence of observations of signal values wherein each observation corresponds to a respective location along the target device'"'"'s path, wherein the sequence of observations and the respective locations constitute a Hidden Markov Model;

    forming a graph that models the topology of the wireless communication environment, wherein the graph indicates;

    a set of nodes, each node indicating a permissible location in the wireless communication environment;

    a set of arcs, each arc indicating a permissible target device transition between two nodes; and

    using the graph to estimate the target device'"'"'s location based on the probabilistic model and the sequence of observations.

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