提高GPS单历元定位精度的方法研究  

Method to Improve Precision of Single Epoch GPS Positioning

作　　者：胡念念[1,2] 阳仁贵[1] 刘根友[1] 

机构地区：[1]中国科学院测量与地球物理研究所,大地测量与地球动力学国家重点实验室,湖北武汉430077 [2]中国科学院大学,北京100049

出　　处：《全球定位系统》2015年第1期7-12,共6页Gnss World of China

基　　金：国家自然科学基金(批准号:41174031;41021003);大地测量与地球动力学国家重点实验室(编号:SKLGED 2013-4-1-Z)

摘　　要：为了将GPS单历元定位精度提高到mm级水平,在讨论卫星高度角定权、相位残差拟合法的基础上,提出了一种新方法:自适应选权拟合滤波法(基于残差常数项拟合修正后的滤波法)。选取一条受多路径误差影响较大的短基线作为实验数据,结果显示,相位残差拟合法能减小系统误差对定位精度的影响,而自适应选权滤波法能削弱粗差的影响,将高程方向的精度提高到mm级。To improve the accuracy of single epoch GPS positioning up to mm grade lev- el, a new method that self-adaptive filter by selection of parameter weight based on error fit- ting is proposed by analyzed methods which are the weight determination of satellite eleva- tion and phase error fitting. Use a short baseline observation data which affected by mul- tipath error heavily as experiment data, and the result suggests that phase error fitting can suppress the influence on positioning accuracy caused by system error, and self-adaptive fil- ter by selection of parameter weight might exclude the influence on positioning accuracy caused by gross error and improve the positioning accuracy of the elevation up to mm grade.

关 键 词：单历元定位 高度角定权 残差拟合修正 自适应选权拟合滤波 

分 类 号：P228.4[天文地球—大地测量学与测量工程]