Research on Autonomous Integrity Monitoring Performance of Vector GNSS Receiver
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摘要: 在分析了矢量跟踪环路和标量跟踪环路故障检测方面差异的基础上，该文指出全球导航卫星系统(GNSS)矢量接收机自主完好性监控(RAIM)技术所存在的问题，即RAIM检测量受噪声影响导致检测故障不准确，和故障信息在环路中的传播使得难以准确识别出故障源。针对上述问题，对矢量接收机的结构进行了改进，提出基于预滤波器的双环路跟踪结构。在新结构中，通过基于容积卡尔曼滤波算法的预滤波器削弱噪声的影响，并通过双环路切换的方法阻止故障信息的传播。仿真实验结果表明，改进后的矢量接收机不仅RAIM检测统计量的均值和方差都显著减小，而且识别故障的准确率有了明显的提高，RAIM性能较原来得到了有效提升。
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关键词:
- 全球导航卫星系统 /
- 矢量跟踪环路 /
- 接收机自主完好性监控 /
- 容积卡尔曼滤波
Abstract: Based on the analysis on the difference between vector tracking loop and scalar tracking loop on fault detection, it is pointed out that in vector receiver of Global Navigation Satellite System (GNSS), the detection statistic of Receiver Autonomous Integrity Monitoring (RAIM) algorithm is inaccurate because of the influence of noise, and the propagation of fault information in the loop makes it difficult to identify the fault source. To solve the problems, a double loop tracking structure based on pre-filter is proposed after modifying the structure of vector receiver. In the new receiver, the influence of noise is reduced by pre-filter based on cubature Kalman filtering algorithm, and the fault information is prevented from propagating to each other by switching the loop. Finally, the method is verified by simulation. Simulation results show that the improved vector receiver not only greatly reduces the mean and variance of RAIM detection statistics, but also improves the accuracy of fault identification. Thus, the performance of RAIM is significantly improved. -
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