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| Study of High Precision Time Synchronization System Based on NIMDO and Optical Fiber Transfer |
| LONG Bo,WANG Ju-feng,HUANG-XU Rui-han,ZHANG Yu,HAN Feng,SHEN Li |
| Institute for Metrology and Calibration of Guizhou, Guiyang, Guizhou 550003, China |
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Abstract A high precision time synchronization system was studied and designed which aimed at synchronizing time in public security traffic management department. The system based on NIMDO traced and synchronized time standard to UTC(NIM) in near real time by satellite common-view method. It transferred time standard hierarchically to public security traffic management department, which combined with optical fiber transfer technology, precise time protocol and network time protocol. The results of validation and analysis showed that 90.53% of the time offset between NIMDO and UTC (NIM) maintained within ±5ns and 98.60% maintained within±20ns; the time offset between the clock units and the time standard were -4.45~4.85 ns when the single-fiber bidirectional transfer was used, 5.01~24.99μs when double-fiber bidirectional transfer was used, 0.64~4.60ms when network time protocol was used. The results showed that the system solved the problem of time traceability and synchronization, and can provide reference for time synchronization in other fields.
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Received: 11 January 2019
Published: 01 September 2019
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2019, Vol. 40 
