Pulse or digital communications – Transceivers – Transmission interface between two stations or terminals
Reexamination Certificate
2002-11-01
2009-11-10
Liu, Shuwang (Department: 2611)
Pulse or digital communications
Transceivers
Transmission interface between two stations or terminals
C375S146000, C375S147000, C375S219000, C375S293000, C375S316000, C455S428000, C455S429000, C455S430000, C342S352000, C342S353000, C342S354000, C342S357490
Reexamination Certificate
active
07616682
ABSTRACT:
Chronologically synchronizing a unique positing signal generated by a positioning-unit device at a known location with a reference positioning signal generated by a reference transmitter at a known geometric distance. The positioning-unit device receives and interprets a reference positioning signal. It then generates and transmits a unique positioning signal, wherein the unique positioning signal is aligned with a frequency steerable clock. The positioning-unit device then receives the unique positioning signal. The positioning-unit device then adjusts the frequency of the frequency steerable clock by an amount derived from a measured frequency difference. The positioning-unit device then determines a reference positioning signal propagation delay between the reference transmitter and the positioning-unit device. At this stage, a time difference is measured between the received reference positioning signal and the received unique positioning signal. Finally, the frequency steerable clock is offset for a period of time derived from the measured time difference and the determined propagation delay and the unique positioning signal is consequently adjusted.
REFERENCES:
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patent: 2006/0291537 (2006-12-01), Fullerton et al.
Liu Shuwang
Locata Corporation Pty Ltd.
Singh Hirdepal
Wiley & Rein LLP
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