Patent ID: 7616682
Filing Date: 2009-11-10
Classification: G01S

Abstract:
1. A method of chronologically synchronizing a unique positioning signal generated by a positioning-unit device at a first known location with at least one reference positioning signal generated by at least one reference transmitter at a second known location different from the first known location, wherein the at least one reference transmitter incorporates timing information in the at least one reference positioning signal, said method comprising the steps of said positioning-unit device: a) receiving and interpreting said at least one reference positioning signal; b) determining a reference positioning signal propagation delay between said at least one reference transmitter and said positioning-unit device; c) generating and transmitting a unique positioning signal; d) receiving and interpreting said unique positioning signal; e) comparing said received and interpreted at least one reference positioning signal and said received and interpreted unique positioning signal to deduce a transmission difference; and f) continuously adjusting said generation and transmission of said unique positioning signal according to: such that said unique positioning signal is chronologically synchronized to said reference positioning signal.