Patent ID: 9121924
Filing Date: 2015-09-01
Classification: G01S,H04W

Abstract:
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, and wherein 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.