Frequency coherence within a location network

Details Frequency coherence within a location network Frequency coherence within a location network

2006-08-16

2010-12-07

Liu, Shuwang (Department: 2611)

Pulse or digital communications

Transceivers

Transmission interface between two stations or terminals

C375S219000, C375S306000, C375S342000, C375S350000, C455S091000, C455S112000, C455S118000

Reexamination Certificate

active

07848397

ABSTRACT:
Generating frequency coherence between a received reference positioning signal carrier component transmitted by at least one reference transmitter and a unique positioning signal carrier component generated by a positioning-unit device. The positioning-unit device receives a reference positioning signal and measures a frequency offset of the reference positioning signal carrier component relative to a common oscillator. Once a frequency offset is measured, the positioning-unit device adjusts a frequency steerable clock by an amount derived from the measured frequency offset. The positioning-unit device then generates a unique positioning signal carrier component at an aligned carrier frequency with the reference positioning signal carrier component. Furthermore, the positioning-unit device continuously adjusts the unique positioning signal carrier component by applying the measured frequency offset to the frequency steerable clock, which is reference to the common oscillator. Subsequently, the frequency of the adjusted unique positioning signal carrier component is aligned with the frequency of said reference positioning signal carrier component.

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