综合孔径干涉望远镜的高分辨率图像重建

High-Resolution Reconstruction of Images from an Interferometry Telescope

利用干涉望远镜成像,可以获取最长基线对应的高频率信息,但往往只能获得部分频域覆盖。为了获得尽可能多的频率信息,可以先通过孔径排布变换,进行更充分的频率采样,再经过干涉图像合成,得到含有完备频率信息的目标高分辨率重建像。介绍了综合孔径干涉望远镜的高分辨率图像重建工作,重点讨论了孔径旋转条件下的干涉图像对齐和合成问题,并成功实施了天文目标的干涉成像观测实验,获得了有完备频率信息的目标高分辨率重建像。

In using an interferometry telescope, information of structures at high frequencies corresponding to the longest baseline can be obtained; however, the U-V plane can only be partially covered. In order to cover the U-V plane as completely as possible, we change the configuration of apertures on the mask of the full aperture of the telescope or rotate the mask in its own plane. The integrated image with the full U-V coverages can be reconstructed by combining interferograms with partial U-V coverages. In this paper, high-resolution image reconstruction of interferometry telescope is described in detail with emphasis on the combination methods of interferograms. We finally show a set of actual observations with the interferometry telescope and the reconstruction procedure as described. The observations successfully lead to high-resolution images with full U-V coverage through the procedure.