一种解决电厂GPS控制网投影长度变形的新方法

New Method to Resolve Scale Error of Gauss Projection GPS Control Network in Power Plant

电厂GPS控制网采用国家统一坐标系统,常常改变控制网各条边的真实长度,引起长度的变形,这对于基于大比例尺地形图的电厂设计及后期施工放样,是十分不利的,为了有效地抵偿GPS控制网投影长度变形,本文分析了常见的几种抵偿长度变形的坐标系统建立方法及其优缺点,在此基础上提出了一种新的针对电厂GPS控制网消除投影长度变形的方法,并举例说明了这种方法具有内、外符合精度高的优点。

it is disadvantage for design and construction of the power plant based on the large scale topographic mapping to use State United Gauss-Krueger plane rectangular coordinate system in GPS horizontal control network, because it usually changes the real length of each side in control network. In order to compensate the scale error efli：ctively .the paper analyses the advantage and disadvantage of familiar several ways to set up the coordinate system of compensating the scale error ,and puts forward a new way to establish the local coordinate system that aviod the scale error of Gauss projection in power plant stu＇veying GPS control network, and illustrate this approach has high internal accuracy and cxtemal accuracy