GALILEO完备性系统中XPL算法研究

RESEARCH ON XPL ALGORITHM OF GALILEO INTEGRITY SYSYTEM

为实现XPL的有效估计,利用HPL和VPL模型,结合实际观测数据进行计算分析,结果表明:利用HPL和VPL计算理论计算出的HPL和VPL的最大值分别小于9m和12m,能够满足12m和20m的限值要求。并且还从标准差角度验证了该算法的稳定性。

In the Galileo integrity system, to confirm the system working normally and the safety of user, it is important to estimate Horizontal/Vertical Protection Level（XPL） effectively. So it is necessary to test the theory of computing HPL and VPL respectively, analyze the results, and validating the availability of the theory by using the observations. The results show that the maximum calculated values of HPL and VPL are less than 9 meters and 12 meters respectively, so can meet the requirement of limited values ： 12 meters and 20 meters, it proves that the theory is efficient and effective. Furthermore, the stability of the theory is proved from the view of the standard deviation.