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.
出处
《全球定位系统》
CSCD
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)
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
Single epoch positioning
elevation angle for parameter weighting
error fit- ting
self-adaptive filter by selection of parameter weighting based on error fitting
