Patent ID: 7511667

Claim:
A method for determining a position solution, said method comprising: transmitting a first ranging signal with code modulation, wherein the first ranging signal is to be transmitted by a first ground transmitter and to be received by a rover; receiving a second signal, the second signal to be received by the first ground transmitter from a second ground transmitter; determining a ground transmitter time relative to a reference time, the ground transmitter time to be determined by the first ground transmitter based on the second signal received from the second ground transmitter; communicating the ground transmitter time relative to the second ground transmitter, the ground transmitter time to be communicated to the rover by the first ground transmitter; receiving the first ranging signal, the first ranging signal to be received by the rover; and determining a position associated with the rover based on the ground transmitter time relative to the second ground transmitter and the first ranging signal, the position to be determined by the rover without synchronization of the first and second ground transmitters to a common clock source.