Patent ID: 6222483
Filing Date: 2001-04-24
Classification: G01S

Abstract:
A position locating system for determining a geographic location of a portable remote unit, comprising:a communications system comprising at least one base station and a system controller, said at least one base station for bi-directionally coupling said remote unit to said system controller through wireless links; anda server coupled to said system controller by a communication infrastructure external to said communications system, said server comprising a data store which contains satellite information for a satellite positioning system;means for transmitting a message from said remote unit to said at least one base station, wherein said message includes a time stamp indicating a time said message is transmitted;wherein in response to said message from said remote unit, said server provides satellite information to said system controller over said communication infrastructure such that said provided satellite information is passed to said remote unit by said at least one base station;wherein said provided satellite information comprises information to aid in acquiring a predetermined number of satellites, said acquired satellites providing coded signals for determining said geographic location of said remote unit; andwherein said server further comprises means for evaluating said time stamp to determine a time delay between said time stamp and a time said message from said remote unit was received, said server providing said satellite information in accordance with said time delay such that said provided satellite information represents said satellites at a time said provided satellite information is received at said remote unit.