Patent ID: 7978049

Claim:
A method of operating a time-of-flight ranging system comprising first and second stations having transmitting and receiving devices, the method comprising the acts of: the first station measuring a time-of-flight of a signal between the first and second stations based on a clock generated from a clock generator; calculating the time-of-flight using a first algorithm when the second station is at a first distance from the first station; calculating the time-of-flight in accordance with a second algorithm when the second station is at a second distance from the first station; wherein the first algorithm is coarser than the second algorithm, and the first distance is greater than the second distance, wherein the first algorithm does not take into account a clock offset of the clock, a clock drift of the clock and timing information better than a single clock cycle of the clock in determining the time-of-flight, wherein the second algorithm takes into account the clock offset of the clock, the clock drift of the clock and the timing information better than the single clock cycle of the clock in determining the time-of-flight.