道路工程GPS平面控制网建网方法

以往GPS建立的平面坐标系属法线系统,而选线设计均在垂线和水准面为基准的坐标系统下进行,其数据未做两化改正而直接用于施工放样。为了消除因GPS引入线路勘测而引发的法线系统坐标系与垂线系统坐标系之间的矛盾,本文采用逆向两化改正的方法,从理论上提出了直接用GPS建立垂线和水准面系统下平面坐标系的技术路线,并推导出逆向两化改正及其精度评定公式。

Arrangement method of GPS plane control network for road engineering

Formerly the GPS plane coordinates is belong to normal system,but route design is done under the coordinates which take the vertical and level surface as a datum,and the data of setting out are not corrected with two transformation corrections.In order to eliminate the contradiction that is taken into road survey by GPS between normal system coordinates and vertical system coordinates,this paper took the method of inverse two transformation correction,put forward a technical route in theory that establish the plane coordinates of vertical and level surface by GPS directly,and deduced the formula of inverse two transformation correction as well as the formula of its accuracy estimation.