基于EGM96模型的GPS水准拟合方法  

A interpolation method for GPS leveling by considering EGM96

作　　者：伍吉仓[1] 王解先[1] 陆彩萍[1] 

机构地区：[1]同济大学测量与国土信息工程系,上海200092

出　　处：《全球定位系统》2002年第4期28-31,共4页Gnss World of China

摘　　要：用GPS测量的方法来获得一点的正高或正常高,需要知道一点的大地水准面差距或高程异常。采用的大地水准面差距或高程异常的精度,决定了GPS水准的精度。本文利用EGM96模型计算高程异常。在利用已知水准点上的高程异常拟合区域似大地水准面模型时,首先移去用EGM96模型计算得到的部分,然后对剩余的高程并常进行拟舍和内插,在内插点上再利用EGM96模型把移去的部分恢复,得到该点的高程异常。通过对某线路GPS水准的计算表明,引入EGM96模型拟合高程的精度改进不大。但对于大范围测量,这种方法有望能改进GPS水准的拟合精度。For obtaining the orthometric or normal height of a point, the geoidal difference or height abnormal value needs to be known at the point. The accuracy of obtain height is determined by the accuracy of the corresponding geoidal difference or height abnormal value used. In this paper, EGM96 is used for calculating height abnormal value of any point on the earth surface. When calculating the coefficients of interpolation model of the local height abnormal value, the height abnormal values on the known points are removed first by EGM96, the remained values are used for calculation the interpolation coefficients. Then the height abnormal value of any point is calculated by the obtained interpolation model and added by the height abnormal value calculated by EGM96. This method has been used in a GPS leveling route, the improvements of height accuracy obtained are not significant. But for large area, this method should be useful for improvement of the obtained height accuracy.

关 键 词：EGM96模型 GPS 水准拟合方法 全球定位系统 高程异常 

分 类 号：P228.4[天文地球—大地测量学与测量工程]