DEVICE AND SYSTEM

WIPO Patent Application WO/2018/150474

A1

[Problem] To calculate the average propagation time between one device and another device through bidirectional communication between the two devices and calculate the distance between the two devices without taking into consideration the delay time of the other device. [Solution] A device provided with: a transmission unit for sending a first signal to another device; a reception unit for receiving, from the other device, a first signal reception time measured by a clock unit provided on the other device, a second signal, and a second signal transmission time measured by the clock unit provided on the other device; a clock unit in the device that operates out of sync with the clock unit provided on the other device and measures a first signal transmission time and a second signal reception time; and a calculation unit for calculating the average value of the propagation time between the device and the other device on the basis of the first signal transmission time measured by the device clock unit, the first signal reception time received by the reception unit, the second signal transmission time received by the reception unit, and the second signal reception time measured by the device clock unit and calculating the distance to the other device on the basis of the calculated average propagation time and the propagation speed.

JP2001213320	TRAIN CONTROL DEVICE
WO/1990/009707	TRANSPONDER SYSTEM

KUSAKABE SUSUMU (JP)
KUBONO FUMIO (JP)
YAMAGATA AKIHIKO (JP)
MATSUMOTO MUNENORI (JP)
NAKAMURA KAZUNARI (JP)
YAMAGUCHI TAICHI (JP)

PCT/JP2017/005371

August 23, 2018

February 14, 2017

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QUADRAC CO LTD (JP)
DENSO CORP (JP)

G01S13/76

JP2016514250A

2016-05-19

YOSHIZAWA, Takao et al. (JP)

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