GNSS receiver autonomous integrity monitoring algorithm based on least squared method

Reliability is an essential factor in a navigation system. Therefore, an integrity monitoring system is considered one of the most important parts in an avionic navigation system. In this paper, GNSS receiver autonomous integrity monitoring algorithm is researched. The theoretical model of GNSS receiver integrity monitoring is set up. The model RAIM algorithm based on least square method is discussed. The RAIM based on algorithm least square uses the consistency of pseudo-range residual to detect and identify the fault satellite. The fault detection and identification method of GPS single system is demonstrated, and the performance of the algorithm is given. The experimental results show that the proposed algorithm can successfully detect GNSS measurement fault. Moreover, the RAIM algorithm based on least square is instructive for the study of BeiDou satellite navigation receiver autonomous integrity monitoring.