基于移动曲面拟合方法的GPS高程转换  

GPS HEIGHT TRANSFORMATION BASED ON MOVING SURFACE FITTING

作　　者：丁海勇[1] 杨延珍[2] 王新志[1] 王晓英[1] 

机构地区：[1]南京信息工程大学遥感学院,南京210044 [2]山东交通学院土木工程系,济南250023

出　　处：《大地测量与地球动力学》2010年第6期82-85,共4页Journal of Geodesy and Geodynamics

基　　金：南京信息工程大学校科研基金(90207)

摘　　要：为提高GPS高程转换的精度,采用移动曲面拟合方法进行分区拟合,以待定点为圆心,设定区域半径,利用区域中的已知数据点拟合出一个二次曲面,并针对曲面拟合中的病态法方程求解的问题,利用岭估计算法进行求解。数值试验表明,移动曲面拟合算法切实可行,且具有较高的GPS转换精度。To improve the accuracy of GPS height transformation from geodetic height to normal height,the moving surface fitting algorithm is presented to fit every sub-region.The point whose normal height is unknown is selected as the circle center.Given the original value of the region semi-diameter,a conicoid is fitted by use of the known points in the region.For the ill-posed equations appeared during the surface fitting,ridge estimation algorithm is used to improve the accuracy of parameter estimation.Some numerical experiments show the feasibility and higher accuracy of moving surface fitting algorithm by compared with other methods.

关 键 词：移动曲面拟合 大地高 高程异常 病态方程 正常高 

分 类 号：P227[天文地球—大地测量学与测量工程]