Research on the Method of Autonomous Integrity Monitoring of Satellite Ephemeris

At present, the autonomous integrity of satellites does not include the monitoring of the correctness of the message, that is, the message does not have an error, but the physical quantity of its own error occurs, the on-board integrity monitoring unit cannot monitor and alarm. Aiming at this type of anomaly in the telegram, this paper studies the method of monitoring the integrity of the ephemeris, and proposes a method for monitoring the integrity of the telegram on the satellite. The statistical analysis and error modeling of the actual ephemeris are carried out using a joint criterion. Alert. This paper proposes a multi-Gaussian variable joint probability calculation method to calculate the integrity risk corresponding to different monitoring thresholds. The monitoring method and integrity risk calculation method proposed in this paper are based on the current design status of the Beidou-3 satellite system. The project implementation cost is relatively small, and a good compromise can be made between service continuity and integrity.