应用CCD立靶时操作不慎造成的靶面不重叠降低了测量精度,有必要对靶面不重叠误差进行分析。通过研究坐标求解模型,将靶面不重叠对结构模型的影响转化为弹丸在CCD像面上成像位置的偏差,推导了三种靶面不重叠情况下成像位置的计算公式。对8m×8m靶面内的误差分布进行了仿真。结果表明:由平行和水平夹角不重叠造成的最大测量误差小于1mm;由垂直夹角不重叠造成的最大测量误差超过6.8mm,对测量精度影响较大。

The system accuracy is affected by noncoplanar target caused by operational errors when it is placed. So the analysis on the noncoplanar error is necessary. According to the study on the coordinates solving model, the impact on the structural model was converted to the imaging position deviation in the CCD image plane. The formulas of image position under the three noncoplanar target conditions were derived. The simulations of error distribution in 8m×8m target were carried out. The studies show that the maximum measurement error is less than 1mm caused by parallel and horizontal angle; The maximum measurement error is more than 6. 8mm caused by vertical angle. The precision of the system is impacted greatly.