Patent ID: 7250906
Filing Date: 2007-07-31
Classification: G01S,G06F,G11B,H03L,H04B,H04J,H04L,H04M,H04N,H04Q,H04W,Y10S

Abstract:
1. A method for identifying a location of an asset in a communication network, said network having a first receiver device and a second receiver device, each receiver device having a known position, said method comprising: estimating more than one first time-of-arrival estimates using a correlation function, said first time-of-arrival estimates corresponding to arrival at said first station of a communication signal from said asset; estimating more than one second time-of-arrival estimates using said correlation function, said second time-of-arrival estimates corresponding to arrival of said communication signal at said second station; calculating more than one time-difference-of arrival corresponding to the difference in arrival of said communication signal at said first and second stations from said asset using said first and second time-of-arrival estimates; and determining the location of the asset using said more than one time-difference-of arrival.