Patent ID: 6108557
Filing Date: 2000-08-22
Classification: G01C,G01S,H04L,H04W

Abstract:
In a system for wireless transmitter location finding, a method for calculating a set of likely locations of a transmitter, the method comprising:(a) measuring at a base station a signal covariance R associated with the transmitter;(b) evaluating a function L.sub.R (i) comparing R with a calibrated subspace associated with a location index i;(c) evaluating a function L.sub.R.sbsb.k '(i) comparing R.sub.k ' with the calibrated subspace associated with location index i, where R.sub.k ' is a calibrated covariance associated with a location index k;(d) calculating a distance G between the functions L.sub.R and L.sub.R.sbsb.k '; and(e) selecting a set of location indices k such that the distance G between R and R.sub.k ' is small.