粗差检测与抗差估计相结合的方法在动态相对定位中的应用  

Application of Combining Method of Outlier Detection and Robust Estimation to GPS Kinematic Relative Positioning

作　　者：王潜心[1,2] 徐天河[2,3,4] 许国昌 

机构地区：[1]中南大学信息物理工程学院,长沙市麓山南路932号410083 [2]德国地学研究中心,波茨坦14473 [3]武汉大学测绘学院,武汉市珞喻路129号430079 [4]西安测绘研究所,西安市雁塔中段1号710054

出　　处：《武汉大学学报（信息科学版）》2011年第4期476-480,共5页Geomatics and Information Science of Wuhan University

基　　金：国家863计划资助项目(2006AA12Z322);国家自然科学基金资助项目(40604003);全国优秀博士学位论文作者专项资金资助项目(2007B51);中国博士后科学基金资助项目(20080430148;200902444)

摘　　要：分析了粗差对GPS动态相对定位的影响,给出了相应的影响函数和抗差估计方法。建议采用粗差探测与抗差估计相结合的方法来处理GPS动态定位中的粗差问题。抗差估计中的等价权分别采用了IGG3方案和双因子等价权函数,对两种方案的效果进行比较和分析,并利用实测数据对所提方法的实际效果进行了检验。结果表明,基于粗差探测和抗差估计相结合的粗差处理方法可有效控制和抵御粗差的影响;分别采用IGG3方案和双因子等价权函数的定位结果差异较小。A numerical simulation was performed to analyze the influence of outliers on GPS kinematic relative positioning.The influence function of errors and the method of robust estimation are given.In order to deal with the outliers in GPS airborne kinematic relative positioning,a combining method of outlier detection and robust estimation is proposed.It includes two steps： firstly,the gross errors are detected and deleted based on the median method in the data preprocessing;then the residual outliers is controlled by the robust estimation in the parameter adjustment.To verify the validation of this method,several experiments are performed.The results show that the influence of the outliers can be effectively controlled and the computing speed is improved,when the combining method are adopted.The kinematic positioning results are compared with those of TGO software and GAMIT software,which shows that the positioning precision of proposed method is about cm-level.

关 键 词：抗差估计 GPS动态定位 粗差探测 

分 类 号：P228.41[天文地球—大地测量学与测量工程]