Patent ID: 7046962
Filing Date: 2006-05-16
Classification: H04B

Abstract:
1. A method for controlling a node in a wireless ad-hoc communications network to provide distance measurement values between nodes of said network using historical data to achieve more accurate results, said method comprising: controlling a first node to receive a plurality of signals from a second node of said network; controlling said first node to calculate a distance between said first and second nodes based on said received signals, and to maintain a record of historical measurement data comprising past distance calculations by said first node which were accepted by a filter adapted to eliminate erroneous measurements, said filter having first and second stages; and controlling said first node to provide at least one distance measurement value between said first and second nodes using at least one of said calculated distance and historical data; and wherein said step of controlling said first node to provide at least one distance measurement value between said first and second nodes comprises controlling said first node to provide a distance measurement value based upon an approximation using a historical data matrix when said first node receives a number of direct signals from said second node wherein said number of direct signals is insufficient to allow an accurate distance measurement calculation between said first and second nodes using a Time Of Arrival measurement technique.