用“施工椭球”定位法提高隧道控制网的精度

Accuracy Improvement for Tunnel Control Network by Construction Ellipsoid Positioning

采用"施工椭球"定位方法 ,可以改正工程测区的似大地水准面相对于参考椭球面的倾斜 ,提高GPS数据转换的精度。本文进一步论述施工椭球面作为高斯投影参考面 ,可以减小起算点的定位误差对隧道控制网尺度的影响。

The positioning of Construction Ellipsoid may correct the quasi-geoids tilting with reference ellipsoid in engineering surveying and can make better accuracy of the data transformation.It is further explained in this paper that construction ellipsoidal surface is used as reference surface of Gauss Projection,which may reduce the influence from positioning error of initial point on control network scale.A case study of tunnel engineering has proved that this method has its advantage.