一种顾及测距误差的GNSS四系统加权选星算法  

A GNSS four-system satellite selection method based on UERE weighted optimization

作　　者：牛月 李克昭[1,2] NIU Yue;LI Kezhao(School of Surveying and Landing Information Engineering,Henan Polytechnic University,Jiaozuo,Henan 454000,China;Collaborative Innovation Center of BDS Research Application,Zhengzhou 450052,China)

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454000 [2]北斗导航应用技术协同创作中心,郑州450052

出　　处：《导航定位学报》2023年第2期124-130,共7页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(41774039);国家重点实验室项目(6142210200104)。

摘　　要：针对全球卫星导航系统(GNSS)四系统可见星测距误差不等,传统公式计算的几何精度因子(GDOP)值不能准确表示多系统组合选星精度和效率等问题,提出一种基于用户等效距离误差(UERE)的GDOP加权选星方法:对不同系统的UERE进行分析,构建一种顾及多种误差的UERE计算模型;并根据谢尔曼-莫里森(Sherman-Morrison)公式增选可见星,通过基于UERE的加权优化法提高计算效率。实验结果表明,相比传统的选星算法,改进的选星算法计算耗时均值可降低72.34%,能够提高多系统快速选星的实时性能。Aiming at the problems that the visible satellite ranging errors of the four systems of the global navigation satellite system(GNSS)are unequal,and the geometric dilution of precision(GDOP)value calculated by the traditional formula can not accurately represent the precision and efficiency of multi-system combined satellite selection,the paper proposed a weighted satellite selection algorithm for GDOP based on user equivalent range error(UERE):the UERE of different systems was analyzed,and a UERE calculation model considering various errors was constructed;then the visible satellites were added according to Sherman-Morrison formula,and the weighted optimization method based on UERE was used to improve the computational efficiency.Experimental results showed that compared with the traditional satellite selection algorithm,the average calculation time of the proposed satellite selection algorithm would be reduced by 72.34%,indicating that the real-time performance of the multi-system fast satellite selection could be improved.

关 键 词：几何精度因子(GDOP) 用户等效距离误差(UERE) 加权 选星算法 全球卫星导航系统(GNSS) 谢尔曼-莫里森公式(Sherman-Morrison) 

分 类 号：P228[天文地球—大地测量学与测量工程]