摘要
GPS高程是基于WGS84椭球的大地高,而实际工程中所需的高程一般是基于似大地水准面的正常高,两者相差一高程异常。本文结合某GPS控制网控制点的高程资料,利用最小二乘支持向量机(LS-SVM)结合径向基核函数(RBF)对高程异常进行拟合,从而实现GPS高程向正常高的转换。与二次曲面拟合法的转换结果进行比较可知LS-SVM法具有更高的转换精度。
GPS height is typically geodetic height with respect to WGS84 ellipsoid, but the normal height （Hnor）is the height above the quasi--geoid, so the difference between the two height systems is called height anomaly. In this paper, some identical survey points of a GPS control net is adopted as the date set in analysis, and then Least Square Support Vector Machine （LS--SVM） with radial basis function （RBF） is proposed to fit the height anomaly so as to convert GPS height to normal height. The results show that the LS--SVR is more promising than conicoid fitting method in converting GPS height.
出处
《工程地球物理学报》
2010年第2期243-247,共5页
Chinese Journal of Engineering Geophysics
