Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2010-12-14
2011-12-06
Doan, Kiet (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S500000, C375S316000, C375S130000, C375S147000
Reexamination Certificate
active
08073465
ABSTRACT:
In a system for measuring a time difference of arrival of signals for positioning, an accurate time difference is measured by a receiver which is reduced in power consumption, size, and cost. The system comprises a node (under measurement) for transmitting a positioning signal, a reference station for transmitting a reference signal, and a plurality of access points for receiving the positioning signal and reference signal, and a server connected to the plurality of access points through a network. Each of the plurality of access points measures a time difference between the reception of the positioning signal and the reception of the reference signal, and a frequency deviation from the reference station, using a clock signal and a signal for shifting the clock signal, and the server calculates the position of the node based on the measured time difference and frequency deviation.
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Fujiwara Ryosuke
Miyazaki Masayuki
Mizugaki Kenichi
Nakagawa Tatsuo
A. Marquez, Esq. Juan Carlos
Doan Kiet
Hitachi , Ltd.
Stites & Harbison PLLC
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