北斗星载原子钟异常数据处理的研究

Research on the Abnormal Data Processing of BDS On- board Atomic Clock

采用精密定轨同时获得北斗星载原子钟差数据进行稳定性分析时，由于星载原子钟钟差数据中粗差、更换参考钟等因素的影响，使得稳定度计算结果与真实结果偏离较大，不能正确反映原子钟的稳定水平。基于此，本文设计了一种上下限约束的方法剔除粗差，对更换参考钟造成的频率跳变进行平移。该方法减小了这些异常数据对频率稳定度的影响，通过对实际数据的处理分析表明，北斗星载原子钟的天稳处在10-13至10-14水平。

When analyzing the stability of the BDS on - board atomic clock bias data obtained by precise orbit determina- tion, due to the impact of several factors such as the gross error made by BDS on - board atomic clocks, the change of reference clock and so on, the computation result of stability significantly deviates from the real result, and it can not reflect the real per- formance of the clocks. In order to solve the problem, a method constraining the clock bias is designed to eliminate gross error, Which can translate the frequency slipping caused by reference clock change, and reduce the influence of these abnormal data on frequency stability. The real data processing result shows that the stability of BDS on -board atomic clock is about 10- 13 to 10-14.