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An Optimized Method to Detect BDS Satellites’ Orbit Maneuvering and Anomalies in Real-Time

机译：一种实时检测BDS卫星的轨道机动和异常的优化方法

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The orbital maneuvers of Global Navigation Satellite System (GNSS) Constellations will decrease the performance and accuracy of positioning, navigation, and timing (PNT). Because satellites in the Chinese BeiDou Navigation Satellite System (BDS) are in Geostationary Orbit (GEO) and Inclined Geosynchronous Orbit (IGSO), maneuvers occur more frequently. Also, the precise start moment of the BDS satellites’ orbit maneuvering cannot be obtained by common users. This paper presented an improved real-time detecting method for BDS satellites’ orbit maneuvering and anomalies with higher timeliness and higher accuracy. The main contributions to this improvement are as follows: (1) instead of the previous two-steps method, a new one-step method with higher accuracy is proposed to determine the start moment and the pseudo random noise code (PRN) of the satellite orbit maneuvering in that time; (2) BDS Medium Earth Orbit (MEO) orbital maneuvers are firstly detected according to the proposed selection strategy for the stations; and (3) the classified non-maneuvering anomalies are detected by a new median robust method using the weak anomaly detection factor and the strong anomaly detection factor. The data from the Multi-GNSS Experiment (MGEX) in 2017 was used for experimental analysis. The experimental results and analysis showed that the start moment of orbital maneuvers and the period of non-maneuver anomalies can be determined more accurately in real-time. When orbital maneuvers and anomalies occur, the proposed method improved the data utilization for 91 and 95 min in 2017.
机译：全球导航卫星系统（GNSS）星座的轨道操纵将降低定位，导航和授时（PNT）的性能和准确性。由于中国北斗导航卫星系统（BDS）中的卫星位于对地静止轨道（GEO）和倾斜地球同步轨道（IGSO）中，因此操纵更加频繁。而且，普通用户无法获得BDS卫星机动的精确开始时刻。本文提出了一种改进的实时检测方法，用于BDS卫星的机动和轨道异常，具有较高的实时性和准确性。改进的主要贡献如下：（1）代替以前的两步法，提出了一种新的精度更高的单步法来确定卫星的起始矩和伪随机噪声码（PRN）当时的轨道机动； （2）首先根据拟议的站点选择策略，对BDS中地轨道（MEO）的轨道动作进行检测； （3）使用弱异常检测因子和强异常检测因子，通过新的中值鲁棒方法检测分类的非操纵异常。来自2017年Multi-GNSS实验（MGEX）的数据用于实验分析。实验结果和分析表明，可以更准确地实时确定轨道机动的开始时刻和非机动异常的周期。当发生轨道操纵和异常时，该方法在2017年提高了91和95分钟的数据利用率。

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