Patent ID: 7859462

Claim:
A method for determining the position of a roving position receiver in a positioning system comprising at least one reference transmitter, and at least one positioning-unit device, said method comprising the steps of: a) each of said at least one reference transmitter generating and transmitting reference positioning signals according to the timebase of said at least one reference transmitter, wherein each of said at least one reference transmitters is at a known location; b) each of said at least one positioning-unit device: i) receiving and interpreting signals transmitted by either said at least one reference transmitter or said at least one positioning-unit device or both said at least one reference transmitter and said at least one positioning-unit device; ii) determining a reference positioning signal propagation delay between said at least one reference transmitter and said positioning-unit device; iii) generating and transmitting a unique positioning signal; iv) receiving and interpreting said unique positioning signal; v) comparing said received and interpreted signals from step (i) and said unique positioning signal from step (iv) to deduce a transmission difference; vi) continuously adjusting said generation and transmission of said unique positioning signal according to: a) said deduced transmission difference from step (v); and b) said reference positioning signal propagation delay from step (ii); such that said unique positioning signal is chronologically synchronized to said reference positioning signals; c) said roving position receiver receiving either: i) said chronologically synchronized unique positioning signals; or ii) both said reference positioning signals and said chronologically synchronized unique positioning signals; and subsequently calculating its own position without the requirement of differential corrections.