Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2006-10-24
2010-06-01
Bost, Dwayne (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456200, C455S456300, C455S456500, C455S456600, C455S560000, C342S450000, C370S331000
Reexamination Certificate
active
07729707
ABSTRACT:
A method for reducing synchronization offset errors in a TDOA location finding wireless system, comprising: receiving transmissions from at least one sync unit at multiple location transceivers, wherein the multiple location transceivers are synchronized from the sync unit; determining actual times-of-arrival of the received transmissions in response to receiving transmissions; performing a wireless distance measurement between the transceivers and the at least one sync unit, the wireless distance measurement performed by the transceivers in response to the received transmissions from the at least one sync unit; computing an actual propagation time between the sync unit to the transceivers; computing differences between the actual propagation time and theoretical propagation time determined in conformity with the predetermined locations; estimating synchronization offset error of the transceivers in conformity with the computed differences; and correcting the synchronization offset error.
REFERENCES:
patent: 2004/0072582 (2004-04-01), Aljadeff et al.
Gunther, Andre and Hoene, Christian, Measuring Round Trip Times to Determine the Distance Between WLAN Nodes, 2005, Internation Federation for Information Processing, Networking 2005, pp. 768-779.
Aljadeff Daniel
Amsalem Reuven
Lavi Amir
AeroScout, Inc.
Bost Dwayne
Desir Pierre-Louis
Moy Jeffrey D.
Weiss & Moy P.C.
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