BDS星载原子钟长期性能分析

发布时间：2018-06-12 11:39

本文选题：BDS卫星钟 + MGEX钟产品　；参考：《测绘学报》2017年02期

【摘要】：北斗卫星导航系统(BDS)于2012年底开始提供区域服务,进行BDS星载原子钟的长期性能分析,对于系统性能的评估、卫星钟差的确定与预报等具有重要的作用。本文基于3年的多星定轨联合解算的BDS精密卫星钟数据,利用改进的中位数方法进行数据预处理,分析了卫星钟差数据的特点,使用卫星钟差二次多项式拟合模型分析了卫星钟的相位、频率、频漂及钟差模型噪声的长期变化特性,根据频谱分析的方法分析了卫星钟差的周期特性,采用重叠哈达玛方差计算并讨论了卫星钟的频率稳定性。综合上述方法及其试验结果较为全面地分析和评估了BDS星载原子钟的长期性能,得到结论:在噪声特性和钟漂特性方面,MEO卫星钟的性能最好,其次是IGSO卫星钟,最差的是GEO卫星钟,所有卫星钟噪声水平和频漂的均值分别为0.677ns和1.922×10~(-18);多星定轨条件下的北斗卫星钟差存在显著的周期项,其主周期分别近似为对应卫星轨道周期的1/2倍或1倍;BDS星载原子钟频率稳定度的平均值为1.484×10~(-13)。
[Abstract]:The Beidou satellite navigation system (BDS) provides regional service at the end of 2012. The long-term performance analysis of the BDS spaceborne atomic clock is important for the evaluation of the system performance and the determination and prediction of the satellite clock difference. This paper uses the improved median method based on the BDS precision satellite clock data of the joint solution of the multi star orbit determination in 3 years. The characteristics of the satellite clock difference data are analyzed. Using the two times polynomial fitting model of satellite clock difference, the long-term change characteristics of the phase, frequency, frequency drift and clock difference model noise are analyzed. According to the spectrum analysis method, the periodic characteristics of the satellite clock difference are analyzed, and the overlapping Hadamard variance is used to calculate and discuss. The frequency stability of the satellite clock is a comprehensive analysis and evaluation of the long-term performance of the BDS spaceborne atomic clock. It is concluded that the performance of the MEO satellite clock is the best in the noise and clock drift characteristics, followed by the IGSO satellite clock, the worst is the GEO satellite clock, and the noise level and frequency drift of all the satellite clocks are both. The values are 0.677ns and 1.922 x 10~ (-18) respectively. There is a significant periodic term for the Beidou satellite clock difference under the condition of multi star orbit determination, and its main period is approximately 1/2 times or 1 times of the corresponding satellite orbit period respectively. The average value of the frequency stability of the BDS spaceborne atomic clocks is 1.484 x 10~ (-13).
【作者单位】：信息工程大学地理空间信息学院;地理信息工程国家重点实验室;
【基金】：国家自然科学基金(41674019) 国家重点研发计划(2016YFB0501701) 地理信息工程国家重点实验室开放研究基金(SKLGIE2015-M-1-6)~~
【分类号】：TN967.1

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