面向北斗异构星座的多参考一致性检验方法

Multiple Reference Consistency Check Method for BeiDou Mixed Constellations

针对卫星导航地基增强系统(GBAS)中多参考一致性检验(MRCC)方法应用于北斗卫星导航时存在故障监测灵敏度较低的问题,提出一种面向北斗异构星座的MRCC方法。该算法通过顾及北斗异构星座与不同卫星高度角区间的观测量质量差异性,采用分区网格化构建思想,改进阈值模型构建策略。采集实测北斗观测数据,人为在测试时段内的全部可见卫星上加入阶跃、缓变、加速度等典型故障对所提方法进行性能测试。阶跃型故障测试中,改进方法相对于传统方法能够探测到变化幅值更小的阶跃型故障;缓变型与加速度型故障测试中,改进方法能够更快地实现故障监测。结果表明,改进方法更适用于基于北斗卫星导航的接收机异常观测量监测。

For the low sensitivity problem of traditional multiple reference consistency check(MRCC)method with BeiDou satellite navigation in ground-based augmentation system(GBAS),a BeiDou mixed constellation-based MRCC method is proposed.Considering the difference of observation quality between BeiDou mixed constellation and different satellite elevations,the threshold selection strategy is improved by using partition construction methodology.BeiDou datasets are collected to evaluate the performance of the proposed method by artificially simulated step,ramp,and acceleration faults for all visible satellites.During the step faults,the improved method can detect the step faults with smaller variable amplitude compared with the traditional method.To the ramp and the acceleration faults,the improved method can achieve fault monitoring faster.The results show that the improved method is more suitable for monitoring the receiver anomaly based on BeiDou satellite navigation.