Patent ID: 7924224
Filing Date: 2011-04-12
Classification: G01S,H04W

Abstract:
1. A method for employing partial coherence processing paths to determine a precise time of arrival (TOA) of a transmission of a wireless device, comprising: receiving a transmission of a wireless device; generating a first digital sample set representing discrete samples of the transmission over a collection duration; providing to first and second partial coherence processing paths copies of a reference and copies of the first digital sample set, wherein the copies are divided into m executing, in the first partial coherence processing path, a first correlation process in which a first set of sample segments is correlated with said reference, said first set of sample segments comprising a first plurality (m non-coherently summing the m executing, in the second partial coherence processing path, a second correlation process in which a second set of sample segments is correlated with said reference, said second set of sample segments comprising a second plurality (m non-coherently summing the m searching outputs of the correlation processes to identify a peak corresponding to an earliest arriving signal in each output set; selecting one of said earliest arriving signals to determine a time of arrival (TOA) value for use in location processing, wherein the selecting is based on the peaks in the outputs of the correlation processes; and using the TOA value in location processing to determine a precise geographic location of said wireless device.