大空间激光扫描多节点融合测量接收器参数标定方法研究

Research on parameter calibration of multi-node fusion receiver for large space laser scanning measurement system

大空间激光扫描多节点融合测量接收器在飞机、船舶等大型装备制造装配过程中的大尺寸复杂零部件隐蔽点精密测量方面被广泛应用,其参数标定精度限制最终测量精度。为解决大空间激光扫描多节点融合测量接收器参数精确标定问题,一种多位置矢量锥约束的非线性最小二乘标定方法在本文中提出。该方法以距离为约束,利用标准锥形标定台构建多空间直线交会测量模型,以锥形标定台顶点为球心旋转接收器构建多位置矢量锥标定模型,并基于Levenberg-Marquardt算法建立了参数非线性优化求解模型。通过SolidWorks三维建模与MATLAB仿真分析了该方法的可行性与鲁棒性,仿真结果表明:引入单节点测量误差为±0.2 mm,多位置矢量锥标定方法实现的空间激光扫描多节点融合测量接收器参数标定精度优于0.02 mm,测距精度优于0.025 mm,能够满足实际工业应用要求。

The large-space laser scanning multi-node fusion measurement receiver is widely used in the precision measurement of hidden points of large-size complex parts in the manufacturing and assembly of large equipment such as aircrafts and ships.The accuracy of receiver’s parameter calibration limits the precision of the whole measurement system.Inorderto obtainhigh precision ofthe parameters,a nonlinear least squares calibration method based on the constraint of multi-position vector cone is proposed in this paper.With distance as the constraint and the calibration cone vertex as the center,by turning the receiver position,a spatial linear intersection multi-position vector cone calibration model and a nonlinear parameters optimization model based on Levenberg-Marquardt algorithm are established in this paper.The feasibility and robustness of the method were verified through SolidWorks 3D and MATLAB simulation analysis.The simulation results show that the error introduced by the single-node measurement is±0.2 mm,in contrast,the error introduced by the methods listed in this article is less than 0.02 mm,and the ranging accuracy is less than 0.025 mm,which can meet the accuracy requirements of industrial applications.