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Method for determination of wireless terminals positions and associated system and apparatus thereof

  • US 9,121,924 B2
  • Filed: 12/06/2011
  • Issued: 09/01/2015
  • Est. Priority Date: 01/13/2011
  • Status: Active Grant
First Claim
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1. A position estimation method to estimate positions of wireless communications nodes using parameters of wireless transmissions, said method comprising:

  • a signal strength collection step where signal strength parameters of wireless transmissions are collected from wireless communications nodes;

    a virtual anchor selection step where for a target node whose position is to be estimated, one or more wireless communications nodes are selected to be virtual anchors based on some criteria;

    a position estimation step where position of the target node is estimated using the signal strength parameters of wireless transmissions associated with the selected virtual anchors and the target node; and

    a position refinement iteration step where the virtual anchor selection step and the position estimation step are re-iterated until there is no significant change in estimated positions, andwherein the virtual anchor selection step selects a first communications node as a virtual anchor for the position estimation of a second communications node, such that said first communications node is a target node in a previous position refinement iteration.

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