基于GPS星座的地基增强系统精度分析

Analysis of Accuracy for Ground Based Augmentation System Based on GPS Constellation

地基增强系统作为新一代民用飞机着陆系统,具备低成本、高覆盖率、高运行效率等优点。为研究地基增强系统对于导航精度的提高,本文基于GPS星座系统,对地基增强系统的定位算法以及精度增强原理进行分析研究,并针对精度因子和伪距误差模型两大精度增强因素进行分析和仿真,仿真得到的误差结果在水平和垂直方向均满足CATⅡ类精密进近的要求,验证了地基增强系统在引导飞机着陆的优越性能。

Ground Based Augmentation System is a new generation equipment for landing of civil aircraft with low cost, high coverage, and high operational efficiency. In order to study the improvement of navigation accuracy of Ground Based Augmentation System, the positioning algorithm and accuracy enhancement principle of this system based on the GPS constellation were analyzed, and the main factors affected system accuracy： Dilution of Precision and pseudo-range error model were studied and simulates. The simulated results show that the accuracy of system can meet the requirements of the CAT II precision approach both in horizontal and vertical directions, and these also verify the superior performance of Ground Based Augmentation System in guiding the landing of aircraft.