基于EGM2008地球重力场模型的GPS高程转换研究

Study on GPS Height Transformation Based on EGM2008 EGM

针对地形起伏较大地区纯粹采用数值逼近方法进行GPS高程转换精度不高的事实,提出了一种在"移去—拟合—恢复"思路的基础上,综合利用EGM2008地球重力场模型和数值逼近算法进行GPS高程转换的方法。通过贵州某段高速公路首级测量控制网实例验证了该方法的有效性和实用性,证实该方法在地形起伏较大的重山区能够达到较高的精度。

For the low precision of GPS height transformation by simple numerical approach in areas of rugged topography,a GPS height transform method,based on remove-polish-restore idea,combining EGM2008 EGM and numerical approach is presented,finally,a example shows that the proposed method is effective and practical,and algorithm proves a satisfying precision in mountains of rugged topography.