摘要
Most GPS positioning errors can be eliminated or removed by the differential technique or the modeling method,but the multipath effect is a special kind of system or gross error,so it is difficult to be simulated or eliminated.In order to improve the accuracy of GPS positioning,the single-epoch pseudorange multipath effects at GPS station were calculated,and firstly modeled based on the spherical cap harmonic（SCH）,which is the function of satellite longitude and latitude with the robust method.The accuracy of the kinematic point positioning technique was improved by correcting pseudorange observations with the multipath effect calculated by the SCH model,especially in the elevation direction.The spherical cap harmonic can be used to model the pseudorange multipath effect.
GPS定位中的多数误差均可通过差分或模型的方式减弱或消除,但多路径效应是一种比较特殊的系统误差,不易被模拟或消除。为提高GPS定位精度,计算GPS测站的单历元伪距多路径效应,首次利用球冠谐分析(SCH)建立测站单历元伪距多路径效应与卫星经纬度之间的函数关系,建模过程中采用抗差估计求解模型参数。在伪距观测数据中加入模型计算的伪距多路径效应改正,伪距动态单点定位精度得到提高,尤其是高程方向精度明显提高。球冠谐分析可用于建立伪距多路径效应模型。
基金
Project (41374009) supported by the National Natural Science Foundation of China
Projects (TJES1101,TJES1203) supported by the Key Laboratory of Advanced Engineering Surveying of NASMG,China
Project (ZR2013DM009) supported by the Shandong Natural Science Foundation of China
Project (201412001) supported by the Public Benefit Scientific Research Project of China
作者简介
Corresponding author： Jin-yun GUO; E-mail： jinyunguo1@126.com
