基于气压高度辅助的机载自主完好性监测算法

卫星接收机自主完好性监测是指根据用户接收机的多余观测值监测用户定位结果的完好性，其目的是在导航过程中检测出发生故障的卫星，并保障导航定位精度。针对卫星接收机自主完好性监测算法可用性不足的问题，结合机载实际导航系统配置，提出了一种基于气压高度表辅助的机载自主完好性监测算法。综合利用卫星导航系统及气压高度表观测信息，建立联合系统的观测模型，推导了基于多解分离的完好性监测及保护级别计算方法。仿真结果表明，相比于传统的接收机自主完好性监测算法，该算法在可见星为5颗时仍能识别故障卫星。该算法具有更好的故障检测能力及可用性，能有效提高卫星导航系统的完好性监测性能，从而保证卫星导航系统的精度和可靠性。

Autonomous Integrity Monitoring with Air Pressure Altitude Aided Algorithm

Autonomous integrity monitoring of satellite receiver refers to monitoring the integrity of the user''s positioning results according to the redundant observations of the user''s receiver, its purpose is to detect the failed satellite during the navigation process and ensure navigation positioning accuracy. Aiming at the problem of insufficient availability of the satellite receiver autonomous integrity monitoring algorithm, an integrity monitoring algorithm based on the auxiliary pressure altimeter with the configuration of the airborne navigation system is presented in this paper. The observation information of the satellite navigation system and the pressure altimeter can be used comprehensively, the observation model of the joint system is established, and the method for the integrity monitoring and protection level calculation based on the multiple solution separation is derived. The simulation results show that this algorithm can still identify faulty satellites when the number of visible satellites is five, compared with the traditional receiver autonomous integrity monitoring algorithm. This algorithm has a better ability of fault detection and availability, it can effectively improve the performance of a satellite navigation system integrity monitoring to ensure the accuracy and reliability of the satellite navigation system.