基于激光映射方法的天线面板变形重构技术研究

Research on Deformation Reconstruction Technology of Antenna Panel Based on Laser Mapping Method

对大型射电望远镜主反射面的单块面板变形进行了研究,将机器人学六自由度姿态变化应用至大型射电望远镜反射面面板的变形研究当中,提出了一种基于刚体六自由度变形的面板变形表征方式。基于该刚体六自由度姿态变形理论,提出了一种基于光学方法的天线面板变形重构技术,该项技术通过固结于面板上的激光单元所呈现的光斑图像来快速高精度地重构出面板的变形。深入地探究了激光光斑与天线面板变形两者之间的映射关系,将天线面板空间变形问题转化为有限区域内的激光光斑位移问题;对该方案的光斑图像进行了研究,提供了有效的光斑图像处理算法;将图像差分方法与Canny边缘检测算法相结合,能够有效地解决传统Canny算法在处理小目标时的问题,还采用了高精度亚像素质心定位算法,能够对光斑点进行亚像素级别的定位。为天线面板的测量提供了一种新的、可靠的图像处理方法,也为提高天线面板测量的精度和效率提供了新思路和方法。

In this paper,a single panel deformation of the main reflector of a large radio telescope is studied and the six degrees of freedom attitude change of robotics is applied to the deformation of the reflector panel of a large radio telescope.A characterization method of panel deformation based on six degrees of freedom deformation of rigid body is proposed.Based on the six-DOF attitude deformation theory of rigid body,an optical reconstruction technique of antenna panel deformation is proposed in this paper.This technology can reconstruct the deformation of the panel quickly and accurately by the spot image presented by the laser unit consolidated on the panel.In this paper,the mapping relationship between laser spot and antenna panel deformation is deeply explored,and the spatial deformation problem of antenna panel is transformed into the laser spot displacement problem in a finite region.And the light spot image of this scheme is studied,and an effective light spot image processing algorithm is provided.It integrates the image difference method and Canny edge detection algorithm,which can effectively solve the problem of traditional Canny algorithm in dealing with small targets.It also uses the high-precision sub-pixel centroid localization algorithm,which can locate light spots at sub-pixel level.It provides a new and reliable image processing method for antenna panel measurement.This study also provides a new idea and method for improving the accuracy and efficiency of antenna panel measurement.