Patent ID: 8711032

Claim:
A ranging system for determining a ranging measurement, the ranging system comprising: a first unit that transmits at least one signal on at least one carrier asking for the ranging measurement, the at least one signal including at least one read range data packet; a second unit that receives the at least one signal, the second unit including: a first oscillator used in receiving the at least one signal and transmitting at least one second signal back to the second unit; a reference oscillator that controls the first oscillator, wherein the at least one read range data packet is used to achieve a commonality of frequency and phase coherence in the reference oscillator; a phase relationship counter; and a fractional phase locked loop, wherein the phase relationship counter keeps track of fractional time frames of the fractional phase locked loop as a function of the reference oscillator, wherein the phase relationship counter provides absolute phase information for an incoming burst on any channel to establish or reestablish a phase relationship of the local oscillator so that the local oscillator is synchronized with the reference oscillator, wherein the first unit receives the at least one second signal and determines the ranging measurement between the first unit and the second unit.