Research on Receiver Autonomous Integrity Monitoring Technology Based on GNSS Baseband Signal

With the increasing requirements for satellite navigation and positioning technology, the detection and identification of faulty satellites has become the focus of attention. Therefore, this paper proposes a receiver autonomous integrity monitoring algorithm based on the original navigation signal to realize the detection and elimination of faulty satellites. This method firstly expresses the signal to noise ratio of the channel by using the original navigation signal; secondly, construct a new covariance matrix by using signal to noise ratio and channel bandwidth; then use the covariance matrix to derive the PVT covariance matrix; finally, the detection and identification of the faulty satellite is carried out. Tests show that the method can detect the influence of slight noise more sensitively; Therefore, the method not only applies the original navigation signal to the integrity monitoring, but also improves the sensitivity of the integrity monitoring, thereby greatly improving its performance.