异地多站联合守时方法研究

Research on multi-station joint timekeeping method

异地多站联合守时方法,一方面可以整合有限的原子钟资源,提高各实验室原子钟的利用率,以及综合时间尺度的稳定性和准确性;另一方面提供了一个稳定和可靠的驾驭参考,提升各站点的实时输出物理信号性能。本文基于中国科学院国家授时中心的多场区和多个远程比对链路的优势,分别在蒲城、临潼和西安场区开展实时物理信号产生试验,综合这些场区的原子钟数据,计算产生联合时间尺度TA。以该时间尺度TA为参考,分别对西安和临潼场区的主钟进行驾驭,最终西安和临潼两站产生的实时物理信号与协调世界时UTC的相位偏差保持在±3 ns。试验表明,采用异地多站联合守时方法,可以实现异地多站复现的物理信号一致性。

For the multi-station joint timekeeping method, on one hand, the limited atomic clock resources can be integrated to improve the utilization rate of atomic clocks, and all the involved atomic clocks can contribute to ultimate time scale, the stability and accuracy of joint time scale can be improved. On the other hand, the joint time keeping can provide a more stable and reliable steering reference, which can effectively improve the performance of real-time output physical signals in various laboratories. Based on the advantages of the multi-stations and multi-comparison links in the National Time Service Center, a real-time physical signal generation experiments were carried out in Pucheng, Lintong and Xi’an respectively, the joint time scale TA were calculated by using the atomic clock data of those stations, and the master clocks in Xi’an and Lintong were steered using this time scale as a reference respectively. Finally, the time differences between UTC and the real-time physical signals generated by stations of Xi’an and Lintong are all keeped within ±3 ns. The experiments shown that the use of the multi-station joint timekeeping method can achieve the consistency performance of physical signals reproduced by different stations.