合成孔径光学系统的成像特性和图像复原  

Imaging characteristic and image reconstruction of synthetic aperture optical system

作　　者：吴俊[1,2,3] 吴桢[1,2] 

机构地区：[1]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042 [2]中国科学院天文光学技术重点实验室,江苏南京210042 [3]中国科学院研究生院,北京100049

出　　处：《应用光学》2010年第4期567-573,共7页Journal of Applied Optics

基　　金：自然科学基金资助项目(10533040)

摘　　要：以Y-4合成孔径系统为基本结构,分析和比较了不同填充因子Y-4系统的U-V平面覆盖、点扩散函数和调制传递函数特性;用Zemax和Matlab软件对系统进行模拟成像,利用维纳滤波和改进的维纳滤波对加噪图像进行复原,使用峰值信噪比(PNSR)标准比较了不同填充因子Y-4系统的复原效果,并分析了影响合成孔径系统成像质量和复原效果的因素。结论如下:通过图像复原,可以极大地改善合成孔径系统所成图像的像质,提高图像的清晰度,使得复原后的图像和其等效单孔径系统所成的像很接近,实现大孔径成像系统的观测效果;图像复原的效果与合成孔径系统的阵列结构和噪声类型有关。Optical synthetic-aperture imaging is one of the most potential techniques for improving the resolution of system.U-V coverage,PSF and MTF of synthetic-aperture system were analyzed with different fill factors.They were discussed on the basis of Y-4 system.This study also generated image simulation of Y-4 system with the help of Zemax and Matlab.software,and restored the images with noise making use of Wiener filter and the modified Wiener filter.Reconstruction results of Y-4 system with different fill factors were analyzed and compared with the help of PNSR.The factors which affected the image qualities and reconstruction results of synthetic-aperture system were also analyzed.The results show that image restoration could improve the image quality of synthetic-aperture system and increase its definition,its image quantity is equivalent to a single aperture system and it can achieve the same effect as big aperture system,and the results of image restoration are dependent on the array structure of synthetic-aperture system and noise types.

关 键 词：合成孔径光学系统 U-V覆盖 点扩散函数 调制传递函数 维纳滤波 图像复原 

分 类 号：TN911.74[电子电信—通信与信息系统]