Patent ID: 7072669
Filing Date: 2006-07-04
Classification: G01S,H04B

Abstract:
1. A method for localizing the position of a wireless device comprising: providing a plurality of directional antennas capable of receiving signals from the wireless device, wherein each directional antenna produces a scan beam using an adaptive beamformer; scanning a volume for a signal from the wireless device using the scan beams of the antennas; using a controller to electronically steer the scan beams to converge at a specified location in the volume; receiving a signal from the wireless device at a minimum number of antennas; determining a time of arrival of the signal for each antenna that received the signal; determining the position of the wireless device based on the determined time of arrival data; applying robust inversion techniques to the position determination to minimize error in the position determination; and controlling the adaptive beamformer of each antenna to ignore or substantially attenuate off-angle delayed multipath signals that fall outside of the scan beams.