Patent ID: 7205938
Filing Date: 2007-04-17
Classification: G01S

Abstract:
1. A method facilitating the location of a wireless node in an RF environment, the RF environment including a plurality of radio transceivers placed in known locations, comprising: detecting, at the known locations of the plurality of radio transceivers, the strength of RF signals transmitted by the plurality of radio transceivers; receiving a request to locate a wireless node; selecting radio transceivers that detect RF signals transmitted by the wireless node; then, for pairs of the selected radio transceivers: then, for each selected radio transceiver, computing an average path loss exponent based on all path loss exponents associated with a respective radio transceiver; and estimating the location of the wireless node based on respective estimated distances between the selected radio transceivers and the wireless node, wherein the respective estimated distances are determined according to a path loss model using the average path loss exponents corresponding to a given radio transceiver and the strength of the RF signal transmitted by the wireless node and detected by the given radio transceiver.