Patent ID: 6292665
Filing Date: 2001-09-18
Classification: H04W

Abstract:
A method of geolocating a wireless communication device comprising the steps of:(a) transmitting a supervisory audio tone (SAT) signal from a base station;(b) receiving said SAT signal returned from said wireless communication device;(c) subjecting said SAT signal transmitted in step (a) and said SAT signal received in step (b) to a range processing operation so as to determine the range of said wireless communication device from said base station wherein said range processing operation is operative to compensate for signal travel time over a loopback path through said wireless communication device using a correlation factor stored in a database and accessed with identification information received from the wireless communication device;(d) subjecting signals received by said base station from said wireless communication device to a direction processing operation so as to determine the direction of said wireless communication device relative to said base station and;(e) identifying the location of said wireless communication device in accordance with said range and direction.