基于高度角和方位角的选星方法

An Satellites Selection Algorithm Based on Elevation and Azimuth

在传统选星算法的基础上,综合考虑GPS定位精度和实时性,提出一种基于高度角和方位角的六星选择算法。通过分析卫星高度角和方位角对于GDOP的影响,选取高度角最大的两颗星为顶座星,选取高度角小且彼此的方位角差分布均匀的四颗星为底座星的六星组合。仿真结果表明:提出的基于高度角和方位角的六星算法能够得到与最佳几何精度因子法相当的结果,但计算量远远小于后者。

Based on the traditional satellites selection algorithms,with consideration of both GPS positioning precision and real-time performance,an improved algorithm of selecting six satellites is proposed.By analyzing the influence of both elevation angle and azimuth angle to GDOP,selects two satellites which have the top two elevation as top satellites,and four satellites which have both small elevation and equality difference of azimuth as base satellites.Simulation results indicate that the algorithm in this paper has almost the same performance as best GDOP algorithm, but simpler and less computation time.