多频GNSS接收机自主完好性监测性能分析

The Performance Analysis Research on Autonomous Integrity Monitoring Algorithm for Multi-Frequency GNSS Receiver

通过对多频接收机的不同频点电离层延时模型的研究,建立起一种新的多频完好性监测方法;并针对测量误差协方差不为对角阵的问题,提出了一种新的易于在用户接收机中实现的预白化处理方法;此外,针对不同频点数的RAIM算法进行了分析。研究结果表明,多频算法可以消除电离层延时误差,定位误差可以降低到10 m以内;当伪距偏差低于50 m时,多频RAIM算法仍然可以进行故障星的检测与识别。仿真分析证明了三频RAIM算法相对双频算法的优越性,对未来的多频接收机自主完好性算法的研究具有很好的理论意义和实用价值。

This paper analyzes the pseudo-range relationship between different frequency signals, and pro- poses a multi-frequency receiver autonomous integrity monitoring （RAIM） algorithm. Aimed at the prob- lems that measurement error covarianee matrix is not diagonal, the paper proposes a new pre-whitening method which can easily be implemented in a receiver. In addition, the paper analyzes the RAIM algo- rithms from different frequency points. The simulation results show that the multiple-frequency algorithm can eliminate the ionosphere error so that the positioning error can be reduced to less than 10 m. In addi- tion, when the pseudo-range deviation is less than 50 m, multi-frequency RAIM algorithm can still be ap- plied in detecting and identifying fault satellite. And the triple-frequency RAIM algorithm is in an advanta- geous position compared to dual algorithm, which would have a tempting theoretical and practical value for the future research of multi-frequency receiver autonomous integrity algorithm research.