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.
龙波,王菊凤,黄徐瑞晗,张宇,韩锋,沈力. 基于NIMDO及光纤传递的高精度时间同步系统研究[J]. 计量学报, 2019, 40(5): 904-909.
LONG Bo,WANG Ju-feng,HUANG-XU Rui-han,ZHANG Yu,HAN Feng,SHEN Li. Study of High Precision Time Synchronization System Based on NIMDO and Optical Fiber Transfer. Acta Metrologica Sinica, 2019, 40(5): 904-909.
［1］林弋戈,梁坤,方占军.时间单位——秒的演进［J］.中国计量,2018,(8):16-17.
［2］赵莎. 基于卫星共视法的电网时频测量及同步技术［J］. 计算机测量与控制, 2016, 12(14): 49-52.
Zhao S. Research on Time Measurement and Synchronization Using Satellite Common—View in Power Grid ［J］. Computer Measurement & Control, 2016, 12(14): 49-52.
［3］Liang Kun, et al. Disciplined Oscillator System by UTC(NIM) for Remote Time and Frequency Traceability ［C］// IEEE European Frequency and Time Forum. Neuchatel, Switzerland, 2014.
［4］高小珣,高源,张越,等.GPS共视法远距离时间频率传递技术研究［J］,计量学报,2008,29(1):80-83.
Gao X X, Gao Y, Zhang Y, et al. GPS Common View Method for Remote Time and Frequency Transfer ［J］. Acta Metrologica Sinica, 2008, 29(1): 80-83.
［5］王正明.GPS共视资料的处理和分析［J］.天文学报,2001,42(2):184-191.
Wang Z M. On the Reduction and Analysis for GPS Common View Data ［J］. Acta Astronomica Sinica, 2001,42(2): 184-191.
［6］张越,高小珣.GPS共视法定时参数的研究［J］.计量学报,2004,25(2):167-170.
Zhang Y, Gao X X. Research on Timing Parameters for GPS Common-view Method ［J］. Acta Metrologica Sinica, 2004, 25(2): 167-170.
［7］Liang Kun, Fei Zuo,Chao Peiet al. Real-Time Remote Calibration (RTRC) System for Time and Frequency［C］// IEEE International Frequency Control Symposium. Prague, Czech, 2013.
［8］国家质量监督检验检疫总局. JJF 1206—2015 时间与频率标准远程校准［S］. 2015.
［9］彭良福, 李有生, 黄勤珍. 一种PTN网络中IEEE1588v2非对称时延的解决方案［J］. 光通信技术, 2013, 37(8): 1-3.
Peng L F, Li Y S, Huang Q Z. A solution to the problem of delay asymmetry for IEEE 1588v2 in packet transport network ［J］. Optical Communication Technology, 2013,37(8):1-3.
［10］赖先主.基于光网络的高精度授时技术研究［D］. 南京:解放军理工大学通信工程学院,2009.
［11］丁小玉,卢麟,张宝富,等.光纤DWDM双向比对法授时的误差分析［C］//时间频率学术会议. 中国,成都,2009.
［12］吴燕. 光纤时间传递系统设计及误差分析［J］. 现代电子技术, 2018, 41(14): 158-159.
Wu Y. Design and error analysis of optical fiber time transfer system ［J］. Modern Electronics Technique, 2018, 41(14): 158-159.
2019, Vol. 40 
