高精度时统系统中固有时延温度影响及其应对措施分析

Analysis and countermeasures temperature effect of fixed time delay in high precision time system

固有时延零值标校作为高精度时统系统建设和维护中一个关键技术环节,其校准准确性和后续变化将直接影响时统系统精度。在长期高精度时统系统建设和维护实践中,发现温度对固有时延变化影响达到百皮秒甚至纳秒量级。本文以典型原子钟组时间频率系统为例,剖析时统系统中固有时延组成;以信号线缆温度相位稳定性数据和设备温度相位稳定性相关实验测试为依据,定量分析温度固有时延变化对时统系统造成的精度影响;提出高精度时统系统固有时延温度系数指标和分解的总体应对措施建议。

As a key technology in the construction and maintenance of the high-precision time integration system,the calibration accuracy and subsequent changes of the fixed time delay zero scale will directly affect the accuracy of the time system.In the long-term practice of construction and maintenance of the high-precision time integration system,it is found that the influence of the temperature on the fixed time delay can reach an order of 100 picoseconds or even nanoseconds.Taking the typical atomic clock group and its distribution system as an example,this paper analyzes the composition of fixed time delay in the time system;quantitatively analyzes the influence of the temperature fixed time delay upon the accuracy of the time system based on the temperature phase stability data of various signal cables and the experimental test of the temperature phase stability of the equipment;puts forward the relevant suggestions for the index of the fixed time delay temperature coefficient,the index decomposition and the calculation method for the high-precision time system.