Patent ID: 8019360
Filing Date: 2011-09-13
Classification: H04B,H04W

Abstract:
1. A method for determining a location of a wireless transmitting device transmitting a digitally modulated transmitted radio frequency signal, the method comprising: at spaced-apart receivers: determining a pairwise time difference of arrival of the received radio frequency signal for two pairs of receivers; determining the location of the device responsive to the pairwise time difference of arrival; and wherein the step of detecting the destination message signal further comprises: (a) incrementally loading the received radio frequency signal samples to successive memory locations of a buffer; (b) selecting received radio frequency signal samples stored in selected memory locations; (c) for each selected sample, determining a detected sample responsive to the selected sample; (d) loading the detected samples into a memory device, wherein a capacity of the memory device is sufficient to store one detected sample for each symbol of the destination message signal; (e) analyzing the detected samples to determine if the detected samples form a valid destination message signal; and (f) repeating the steps (a) through (e) until a result at the step (e) indicates the detected samples form a valid destination message signal.