分布式守时架构下的高精度时间比对技术研究

为了实现分布式联合守时系统建立需求，设计了远程时间比对系统，包含卫星共视、卫星双向和光纤双向三种时间比对手段，系统内使用的国产化设备比对精度与进口设备相当，实现了实验室间多手段、高精度钟差测量。使用移动校准站完成了时间比对设备相对零值校准，在相距50 km的实验室间开展长达20天的时间比对，试验结果表明，三种比对手段测量得到两地钟差均值相差小于1 ns，变化趋势相同，变化幅度相近，均可以准确测量得到两地钟差。

Research on High Precision Time Comparison Technology under Distributed Punctuality Architecture

In order to meet the demand for distributed joint timekeeping system, a remote time comparison system was designed, which includes satellite co-visibility, satellite bi-directional, and fiber bi-directional time comparison means. The domestic equipment used in the system has the same time comparison accuracy as imported equipment, achieving high-precision clock difference measurement between laboratories using multiple means. The relative zero value calibration of the time comparison equipment was completed using a mobile calibration station, and a 20-day time comparison was conducted between laboratories that were 50 km apart. The experimental results show that the mean clock difference measured by the three comparison means at the two locations is less than 1 ns, the trend is the same, and the amplitude is similar, and all can accurately measure the clock difference between the two locations.