应用光学, 2010, 31 (4): 567, 网络出版: 2011-02-15   

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
吴俊 1,2,3,*吴桢 1,2
作者单位
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
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。
Abstract
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.

吴俊, 吴桢. 合成孔径光学系统的成像特性和图像复原[J]. 应用光学, 2010, 31(4): 567. WU Jun, WU Zhen. Imaging characteristic and image reconstruction of synthetic aperture optical system[J]. Journal of Applied Optics, 2010, 31(4): 567.

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