時刻管理装置、時刻基準装置、基準時刻管理システム、および基準時刻管理方法

摘要

PROBLEM TO BE SOLVED: To provide a system and a method that are usable in order to realize time synchronization and time transmission with higher accuracy than PTP.;SOLUTION: A local device 10 capable of grasping an absolute time periodically sends out an optical pulse 22 to an optical transmission line 13 while being synchronized to the absolute time. A remote device 12 monitors the time interval Δt₁ of optical pulses 22 arriving via the optical transmission line 13 in order to synchronize itself with the absolute time on the local device 10 side. By detecting a deviation between the time interval Δt₁ of optical pulses 22 measured by the remote device 12 and the time interval Δt₀ of optical pulses 22 sent out by the local device 10, the amount of optical fiber length variation of the optical transmission line 13 attributable to a temperature change is specified. The remote device 12 calculates the absolute time in real time on the basis of a variation of reception interval of received optical pulses 22, a transmission reference time and transmission line information.;SELECTED DRAWING: Figure 4;COPYRIGHT: (C)2019,JPO&INPIT