中国散裂中子源控制网测量方案及数据处理

Surveying Scheme and Data Processing of the Primary Control Network for China Spallation Neutron Source

详细介绍了中国散裂中子源工程测量首级控制网的布设、测量方案及数据处理方法 ;由于加速器设备以及二级控制网点布设在地下隧道,因此研究了地面至隧道30 m高度投点对中及仪器量高的方法。采用Wild NL投点仪投点以及AT401激光跟踪仪量高,可达到1.5 mm对中以及1 mm量高精度。平面控制网测量采用GPS静态观测,TBC软件进行数据处理。对GPS椭球投影变形进行了分析,选择合适的抵偿投影带,并将投影后距离与全站仪测量距离进行对比可知,投影变形小于0.5 mm,从而验证了GPS数据处理的正确性。为了保持与独立坐标系统的一致性,提出将GPS无约束投影坐标进行固定一点一方向旋转平移变换,并与前期坐标进行对比,标准偏差为1.2 mm,说明该成果正确可靠,可满足工程建设要求。

In order to guarantee the construction of China Spallation Neutro Source(CSNS), this paper described the design, the surveying scheme an data processing method of the control network in detail. Because of th accelerator facility and secondary control points were all in the undergroun tunnel, the method of plumbing and centering and height measuremen from tunnel to ground about 30 m was studied, and the accuracy could b achieved for plumbing and centering about 1.5 mm and height measurin about 1 mm by Wild NL and AT401 laser tracker. Comparing the distanc projected with the length obtained by total station, the deviation was les than 0.5 mm, which verified the correctness of GPS data processing. A last, in order to keep consistent with the independent coordinate system, coordinate conversion method was proposed by fixed a point and a directio with GPS unconstrained projection coordinates, and the standard deviatio was 1.2 mm different from the coordinates in the early period. The resul shows that the method is feasible and reliable, and can meet the requirement of engineering construction for CSNS.