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

作　　者：顾利亚[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《工程勘察》2004年第4期55-57,共3页Geotechnical Investigation & Surveying

摘　　要：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.

关 键 词：全球定位系统 隧道控制网 施工椭球 坐标转换 

分 类 号：P228[天文地球—大地测量学与测量工程] U448[天文地球—测绘科学与技术]