一种BDS星钟异常实时探测与处理算法  

A Real- time BDS Satellite Clock Anomaly Detection and Processing Algorithm

作　　者：赵丹[1] 周佩元 杜兰[1] 

机构地区：[1]信息工程大学导航与空天目标工程学院,河南郑州450001

出　　处：《测绘科学与工程》2015年第5期69-74,共6页Geomatics Science and Engineering

基　　金：国家自然科学基金资助项目（41174025）.

摘　　要：通过连续监测钟差时序数据，可以快速探测星载原子钟异常，从而确保卫星导航系统的完好性。本文结合广义似然比检验（GLRT）方法和多项式钟差模型，提出了一种新的实时原子钟异常探测与处理方法：首先，基于GLRT方法进行实时异常探测；然后采用多项式钟差模型进行短期钟差外推，在此基础上剔除异常值并以估值代替；最后，利用武汉大学分析中心提供的精密BDS钟差数据进行仿真。验证结果表明，该方法能够快速有效地探测和处理原子钟异常（尤其是频率跳变异常），较好地保证了BDS原子钟数据的完好性。Spaceborne atomic clock anomaly can be detected quickly by continuously monitoring of clock bias, thus it ensures the integrity of satellite navigation system. This paper puts forward a new method of real - time atomic clock anomaly detection and processing combined with principles of Generalized Likelihood Ratio Test （ GLRT ） and polynomial clock model. Firstly j the real time anomaly detection is done based on the GLRT. Then the short - term clock bias is forecasted and extrapolated by u- sing the polynomial clock model, and on this base, the anomaly points are eliminated and replaced by extrapolation values. This paper simulates the examples based on BDS satellite clock bias provided by Wuhan University Analysis Center. The results show that the method can detect and handle atomic clock anomalies effectively （ especially abnormal frequency jumps ）, and it can guarantee the integrity of BDS atomic clock data.

关 键 词：BDS星钟 原子钟异常探测 GLRT探测器 钟差模型 

分 类 号：P236[天文地球—摄影测量与遥感]