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大孔径衍射受限光学合成孔径系统MTF中频补偿

Large Aperture Diffraction Limited Optical Synthetic Aperture System Intermediate Frequency MTF Compensation

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摘要

光学合成孔径(OSA)技术能够极大地提高光学系统的空间分辨率, 但是由于孔径的离散与稀疏, 导致其调制传递函数(MTF)中频部分相比单一口径系统显著下降。论述OSA成像的方式和原理, 分析OSA中频MTF下降的原因和原理。以填充因子为线索, 分别给出大填充因子中频MTF下降和小填充因子中频MTF缺失的处理方法。对于中频MTF下降, 采用图像复原的方式恢复图像中的中频信息; 对于中频MTF缺失, 采用两个系统分别成像再融合图像的方法补偿中频。分别分析了两种方法的可行性, 给出了两种情况的Zemax仿真验证, 结果表明两种方法均可行。

Abstract

Optical synthetic aperture (OSA) can greatly improve the spatial resolution of the optical system. However, due to the aperture dispersion and sparsity, the intermediate frequency (IF) modulation transfer function (MTF) of OSA imaging system is significantly lower than that of single aperture system. We first analyze the imaging method and principle of OSA imaging system, then discuss the reason and principle of the IF MTF reduction of OSA. Taking the filling factor as a clue, we propose the method of processing the IF MTF reduction with large filling factor and the IF MTF missing with small filling factor. For the IF MTF reduction, we use image restoration method to restore the IF information in the image. For the IF MTF missing, we fuse two images generated in two systems respectively to compensate the IF information. We analyze the feasibilities of the two methods and simulate the two cases in Zemax software. The results show that both methods are feasible.

Newport宣传-MKS新实验室计划
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中图分类号:O436.1

DOI:10.3788/aos201838.0411005

所属栏目:成像系统

基金项目:航空科学基金(20160177007)

收稿日期:2017-10-13

修改稿日期:2017-11-13

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作者单位    点击查看

周程灏:哈尔滨工业大学航天学院, 黑龙江 哈尔滨 150001
王治乐:哈尔滨工业大学航天学院, 黑龙江 哈尔滨 150001
张树青:哈尔滨工业大学航天学院, 黑龙江 哈尔滨 150001
陆敏:哈尔滨工业大学航天学院, 黑龙江 哈尔滨 150001

联系人作者:周程灏(13B921004@hit.edu.cn)

备注:周程灏(1989-), 男, 博士研究生, 主要从事光学合成孔径方面的研究。E-mail: 13B921004@hit.edu.cn

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引用该论文

Zhou Chenghao,Wang Zhile,Zhang Shuqing,Lu Min. Large Aperture Diffraction Limited Optical Synthetic Aperture System Intermediate Frequency MTF Compensation[J]. Acta Optica Sinica, 2018, 38(4): 0411005

周程灏,王治乐,张树青,陆敏. 大孔径衍射受限光学合成孔径系统MTF中频补偿[J]. 光学学报, 2018, 38(4): 0411005

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