光学综合孔径成像中的傅里叶相位研究

傅里叶相位是光学综合孔径成像的重要信息，观测目标的傅里叶相位包含于干涉条纹中。从像平面干涉条纹形成原理出发，推导出大气扰动、星光方向与基线方向不垂直和望远镜系统机械误差等因素是影响干涉条纹初始相位的主要因素。利用条纹原点值和峰值位移从条纹中提取初始相位，采用闭合相位法从条纹初始相位中去除其它因素的影响，从而最终获取目标傅里叶相位：结合计算机模拟对噪声给条纹峰值位置的影响进行分析，模拟结果表明在频域中对条纹能量谱进行阈值处理有较好的去噪效果。最后结合目标重构迭代法阐述了闭合相位在像重构中的作用。

Research of Fourier Phase in Optical Synthetic-Aperture Imaging Technique

Fourier phase is important information for optical synthetic-aperture (OSA) imaging. The observed object′s phase is located in interferogram fringes. Factors affecting the OSA interferogram fringes′ initial phase were analyzed in detail from the mechanism of interferogram fringes in the image plane. With the original point value and the fringe peak displacement, the initial phase can be obtained from the fringes. With closure phase method, the error phase caused by atmosphere disturbance unnormal of star light direction to baseline direction, and telescope mechanic system, can be eliminated, and the real object Fourier phase can be obtained at last. With a threshold method in the frequency domain, noise affecting fringe peak′s location can be eliminated. The role of closure phase method is talked in the image reconstruction with hybrid iteration method.