Sumitomo Electric Industries, Limited

Sumitomo Wiring Systems, Limited

Autonetworks Technologies, Limited

Kazuyuki Inoue

Tatsuya Izumi

Tadashi Matsumoto

Yojiro Suyama

Kazuki Kitagawa

A vehicle-mounted device stores delay time information of a first set and a second set. The first set includes a first transmission delay time from an external portion to a measurement reference position at a data reception time, and a second transmission delay time from an external portion to a measurement reference position at a data reception time in another device. The second set includes a third transmission delay time from a measurement reference position to an external portion at a data transmission time, and a fourth transmission delay time from a measurement reference position to an external portion at a data transmission time in the other device. A propagation delay time between the devices is measured by time synchronization information to and from the other device, the measured propagation delay time is corrected based on the stored delay time information, and time synchronization between the devices is performed.

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Yokkaichi, Japan

Kazuyuki Inoue