非正交轴系全站仪坐标测量系统误差分析技术研究

基于非正交轴系全站仪坐标测量系统的结构特点和测量模型,用数学分析的手段对其进行误差分析和测量不确定度评定。确定系统的主要误差分量是转台旋转角误差和激光跟踪仪测距值误差,并用GUM法评定各分量的不确定度。通过测量模型推导出系统的测量不确定度,并用MATLAB进行仿真,结果表明:当测距值不变时,测量不确定度几乎不受水平角变化的影响,而随着垂直角绝对值的增大而增大,当角度值不变时,测量不确定度随着被测点到视准轴上标定点的距离值增大而增大。实验初步验证了仿真结果的准确性。

The Error Analysis of the Non-orthogonal Total Station Coordinate Measurement System

According to the Non-orthogonal total station system principle, the main sources of the system measurement error are the rotation angle errors of rotary tables and the distance measurement error of the laser range finder. Using GUM algorithm, the uncertainties of these two sources are estimated and the system measurement uncertainty is evaluated. The result is validated by the simulation on MATLAB and the experiment conducted in the laboratory. The results show that when the distance is constant, the measurement uncertainty is almost independent of the horizontal angle, and increases with the absolute value of the vertical angle. When the angle value is constant, the measurement uncertainty increases with the distance from the measured point and the calibration point on the collimated axis.The accuracy of the simulation results is preliminarily verified by experiments.