GPS/GLONASS组合定位的抗差Helmert方差分量估计模型  

Robust Stochastic Model of Combined GPS and GLONASS

作　　者：高晓[1,2] 戴吾蛟[1,2] 

机构地区：[1]中南大学测绘与国土信息工程系,湖南长沙410083 [2]湖南省精密工程测量与形变灾害监测重点实验室,湖南长沙410083

出　　处：《全球定位系统》2012年第6期17-20,25,共5页Gnss World of China

基　　金：中南大学前沿研究计划(2009Q22D002);广东省财政产业技术研究与开发专项基金资助的课题

摘　　要：GPS和GLONASS存在系统差异,组合定位时,采用Helmert方差分量估计可得到更加准确的结果。但GNSS观测值常受到衍射信号和多路径效应的影响,使观测值存有粗差,从而导致Helmert方差分量估计的失真。为此,将抗差Helmert方差分量估计应用于GPS/GLONASS组合单点定位,实验结果表明:抗差Helmert方差分量估计可以有效地抑制组合系统粗差观测值的影响。More accurate positioning results would be contained in GPS/GLONASS com- bined system by using Helmert variance component estimation since its systemic differences. However, outliers that introduced by signals-diffraction or multi-path effects, often cause a distortion of the method. So, an experiments of robust Helmert for GPS/GLONASS com- bined system was conducted by a self-programing package, and the results show that the ro- bust Helmert method of variance component estimation could restrain the influence of outli- ers effectively.

关 键 词：GPS/GLONASS 抗差估计 HELMERT方差分量估计 随机模型 

分 类 号：P223[天文地球—大地测量学与测量工程]