GPS 高程拟合方法及精度分析

摘要

GPS高程拟合的方法及其所能达到的精度，已成为测绘界关注的一个热点。拟合方法是否恰当，拟合后的精度能否满足要求，直接关系到GPS高程在实际工程中的应用。本文结合应用实例来研究GPS高程拟合的方法，主要包括二次多项式法、多面函数和加权平均法，并利用MATLAB编程实现高程异常的曲面拟合。通过对各种拟合方法的精度分析，得出如下结论：二次多项式法比较适合本应用实例，若选取合适的已知点点位分布、密度，该方法能够达到毫米级精度。%The methods and accuracy of GPS elevation fitting has become a hotspot .Fitting method is appropriate .The fitting preci-sion can meet the requirements , and is related to GPS elevation application in engineering .The paper studies the methods of GPS ele-vation fitting by application examples , including the quadratic polynomial , multi-faceted function method and the weighted average method.And the abnormal height surface is fitted out by MATLAB .Through the analysis on the accuracy of the various fitting meth-ods, it obtains the following conclusions:the quadratic polynomial method is more suitable for this application instance .If selecting the appropriate distribution and density of known points , this method can achieve millimeter accuracy .