Propagation time measurement device and electronic key system

A propagation time measurement device measures a propagation time of a transmission signal from when the transmission signal is transmitted, through wireless communication, from a base station to a terminal to when the transmission signal is returned to the base station from the terminal. Continuous...

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Bibliographic Details
Main Author KENICHI KOGA
Format Patent
LanguageChinese
English
Published 20.08.2014
Subjects
ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE
CHECKING-DEVICES
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
GENERATING RANDOM NUMBERS
PHYSICS
REGISTERING OR INDICATING THE WORKING OF MACHINES
TIME OR ATTENDANCE REGISTERS
VOTING OR LOTTERY APPARATUS
WIRELESS COMMUNICATIONS NETWORKS
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Summary:A propagation time measurement device measures a propagation time of a transmission signal from when the transmission signal is transmitted, through wireless communication, from a base station to a terminal to when the transmission signal is returned to the base station from the terminal. Continuous waves having different frequencies are combined to generate the transmission signal. The propagation time measurement device includes a correlation computation unit that generates correlation values by performing a correlation computation on each of the continuous waves and a reception signal that is returned from the terminal and received by the base station. A propagation time measurement unit measures the measurement time from a phase of the correlation value generated for each continuous wave during the correlation computation.
Bibliography:Application Number: CN201410054954