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针对中国散裂中子源(CSNS)210 m长、6 m宽的大尺度直线隧道控制网,提出了具体观测方案,对观测仪器的选择、控制网布设、测量方式及数据处理进行了介绍;基于两类跟踪仪分两期测量,并采用相邻站拟合偏差、边角观测差对数据预处理和光束法平差进行了计算,对两型跟踪仪的测量精度及稳定性进行了比较。结果表明:1采用激光跟踪仪观测,相邻站拟合偏差值为0.05 mm左右,测距值不高于0.06 mm,水平和垂直向测角算术平均值在4″以内,且水平向测角精度比垂直向高1″左右;2对于狭长大尺度直线控制网,X向网形可靠,解算精度高,Y向网形易扭曲,解算精度下降;3Leica AT401型跟踪仪观测精度略高于FARO X1,但当隧道环境稳定之后,两种跟踪仪对于200 m左右的狭长直线网得到的平面方向坐标重复性均在0.5 mm之内。
Aiming at the large-scale linear tunnel control network of China Spallation Neutron Source (CSNS) of 210 m long and 6 m wide, a specific observation scheme is proposed to introduce the selection of observing instruments, the layout of control network, the measurement methods and data processing. Based on the two types of tracker measurements in two phases, the data preprocessing and beam method adjustment were performed by using the fitting error of the adjacent stations and the difference of the edge angles. The measurement accuracy and stability of the two types of tracker were compared . The results show that: 1 The laser tracker observes that the fitting deviation of adjacent stations is about 0.05 mm, the range value is not higher than 0.06 mm, the arithmetic average of horizontal and vertical measurement angles is within 4 ", and the horizontal angle of measurement The accuracy of the 3Leica AT401 tracker is slightly higher than that of the vertical one. 2) For the long and narrow linear control network, the X-direction mesh is reliable, the solution accuracy is high, the Y-shape is easy to distort and the solution accuracy is reduced. However, when the tunnel environment is stable, the repeatability of the planar track coordinates obtained by the two trackers for an elongated straight line of about 200 m is within 0.5 mm.