激光跟踪仪与室内GPS的协同测量组网方法

A Collaborative Measurement Networking Method Between Laser Tracker and iGPS

针对大型装备制造业中大部件对接测量任务的大尺寸、高精度、高效率、高可靠性的测量需求,设计了一种采用激光跟踪仪与室内GPS的协同测量方法,该方法可集成两个系统各自优势满足测量需求。在研究两种系统的测量原理和方法的基础上,提出了一种基于多传感单元观测值的基本约束方程构建方法,同时引入一维基准尺和三维坐标场两种几何约束构建相对约束方程用以提高组网精度。利用Levenberg-Marquardt迭代算法完成最优化求解,为提高迭代效率和精度设计了基于后方交汇的迭代初值计算方法。现场条件下的精度验证实验数据表明,室内GPS和激光跟踪仪组成的协同测量网络的测量误差小于±0.06mm,验证了算法的正确性和精度。

In order to meet the measurement requirements of large size,high accuracy,high efficiency and high reliability in the large-scale equipment manufacturing industry,especially the large components assembling,a collaborative measurement method using laser tracker and iGPS is designed,which can integrate the advantages of the both systems.After explaining the working models and mathematical principles of the both systems,the basic constraint equations based on multi-sensor unit observations in each measuring system were constructed.At the same time,both the one-dimensional scale-bar and three-dimensional coordinate control network are used to construct relative constraint equations to improve the accuracy of the network.The Levenberg-Marquardt iterative algorithm is used to solve the equations.The produce of the initial value is given to improve the accuracy and efficiency of the iterative algorithm by using latter intersection.The experimental data show that the distance measurement error in industrial field is within ±0.06 mm,which can testify that the network construction algorithm is correct and has high precision.