GPS控制网联测时遮挡严重的一种解决方法

A method of solving the shelter problem of GPS net work linking

针对GPS控制网与国家控制点联测时遮挡严重的问题,提出了一种虚拟基线的方法,即通过常规方法测出GPS网中某点与国家控制点之间的基线构造元素,并利用WGS84地心坐标系与站心地平直角坐标系之间的转换模型计算出国家控制点的WGS84地心坐标,然后根据GPS商业处理软件的基线格式构造出GPS网中某点与国家控制点之间的虚拟基线,并入整个GPS控制网中进行平差解算.从而解决了与国家控制点联测时因遮挡等原因GPS基线不合格或质量不高而使整个控制网精度下降的问题.并通过实例对其进行了检验,达到了较好的效果.

In order to solve the shelter problem of GPS network and state control points conjunction, a method of constructing virtual vector was put forward in this thesis. By using constructing elements between GPS net work point and state control point determined by ordinary survey instruments and making use of converting formula of the WGS-84 coordinate system and occupation station original based grid system, the WGS-84 coordinates of the state control point were calculated. Then the virtual vectors are constructed according to the format of GPS process programmer and put into whole GPS network.