区域性独立坐标系与三维地心坐标系的转换

Transformation Between Three Dimension Geocentric Coordinate System and Independent Coordinate System

摘要:

对于区域性独立坐标系与三维地心坐标系之间的互相转换,提出了一种在GPS网平差中不以54或80国家参考椭球为过渡的平差转换方法.在有条件地通过网平差使全部GPS网点获得精确的三维地心坐标情况下,先基于WGS 84(1984世界大地坐标系)椭球进行椭球变换,再在高斯平面上平移旋转转换,就能方便、精确地将三维地心坐标转换到既有的独立坐标系上.其优点是,在GPS网平差的同时,不仅能实现两种坐标系之间的精确转换,而且能得到供整个测区长期应用的一整套转换参数.类似地,又提出了利用3个重合点在较小区域求定转转换参数的简

Abstract:

A new method of transformation between the three dimension geocentric coordinate system and independent coordinate system in adjustment of GPS networks is proposed.Compared with the conventional methods,it is not based on the 54 or 80 national reference ellipsoid.In the present technical situation,it’s easy to get the accurate geocentric coordinates on all control points with GPS.In order to transform the coordinates to the existent independent coordinate system exactly and conveniently,the regional ellipsoid surface approximated to the projection plane is firstly adopted in this mode,and then transformation is realized on Gauss plane.This method not only realizes the accurate transformation between the two coordinate systems,but also provides a complete set of transformation parameters for the whole area for a long period.Analogously it provides also a new simple method which can generate the transformation parameters with 3 known points in the smaller area.