航空用户对卫星导航系统完好性指标的要求极高, 依据GNSS组合系统提升完好性水平的思想, 提出一种使用保护门限作为多星座组合系统航空用户完好性监测指标的算法。该算法将不同星座、不同完好性监测方式紧密结合, 使航空用户的完好性水平大幅提高。仿真结果表明, GPS/Galileo/北斗组合系统能够为全球范围内的低空飞行、极区导航提供安全保障, 证明了该算法的有效性与可行性。

The aviation users have high requests to integrity of GNSS.Based on the idea of improving the integrity level of GNSS combined system, an algorithm is put forward using protection threshold as an indicator for monitoring the integrity of GNSS combined system for aviation users.The algorithm integrates tightly the different satellite systems with different integrity monitoring methods, which can increase the aviation users' integrity level significantly.The simulation results show that the combined system of GPS/Galileo/Compass can provide global low-altitude flight and polar navigation with security assurance, and the effectiveness and feasibility of the method is proved.