地基望远镜的成像分辨率通常都受到大气湍流的限制,这种限制在对扩展目标进行观测成像时变得尤为显著。幸运成像技术是一种基于目标序列短曝光图像选取、配准、叠加的事后图像处理方法,能够有效降低大气湍流导致的成像闪烁和抖动对图像质量的影响,提高望远镜的成像分辨率。介绍了扩展目标幸运成像技术的基本原理和基本流程,并应用该项技术对近地扩展目标大气湍流成像的实验观测数据进行事后处理。处理结果表明,幸运成像技术能够提高扩展目标通过湍流大气的成像分辨率。

The imaging resolution of all ground-based telescopes is severely limited by the effects of atmospheric turbulence,especially for imaging the extended objects. The lucky imaging technique is an image post-processing method based on selecting-recentring-coadding of sequence short-exposure images of objects,which can reduce the influence of image quality because of turbulence-induced imaging motion-blur restoration and reduce the resolution loss. The basic theory and flow of lucky imaging are introduced,and then this technique is used on the data of experimental observation of extended objects through atmospheric turbulence. The results show that the lucky imaging technique can improve the imaging resolution of extended objects through atmospheric turbulence.