| 基于NUFFT 算法的综合孔径辐射计图像反演方法 |
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| 引用本文： | 陈,柯,赖,利,贺,锋,胡,飞,李召阳.基于NUFFT 算法的综合孔径辐射计图像反演方法[J].微波学报,2014,30(2):84-87. |
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| 作者姓名： | 陈 柯 赖 利 贺 锋 胡 飞 李召阳 |
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| 作者单位： | (1. 华中科技大学电子与信息工程系,武汉430074;2. 多谱信息处理技术国家级重点实验室,武汉430074
3. 毫米波遥感技术重点实验室,北京100039) |
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| 基金项目： | 国家自然科学基金(61172100,41275032),中央高校基本科研业务费专项资金(2013QN135),教育部留学回
国人员科研启动基金 |
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| 摘 要： | 圆形阵列和旋转阵列排布方式的提出是为进一步降低综合孔径辐射计成像系统的复杂度和成本,然
而其缺陷在于过于复杂的亮温图像反演过程,因为该阵列排布方式下的采样样本不是均匀分布于整个采样平面,常
规的标准傅里叶变换不能直接运用于此反演过程。提出了一种非标准快速傅里叶变换(NUFFT)算法,用于非均匀
采样样本的综合孔径辐射计图像反演计算,该算法结合了高斯栅格算法和对过采样样本的快速傅里叶变换算法,仿
真结果表明该算法能够准确地得到反演图像。
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| 关 键 词： | 天线阵列排布 综合孔径辐射计 非标准快速傅里叶变换 非均匀样本 |
An Image Reconstruction Method for Synthetic Aperture Imaging
Radiometers Based on NUFFT Algorithm |
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| CHEN Ke,LAI Li,HE Feng,HU Fei,LI Zhao yang.An Image Reconstruction Method for Synthetic Aperture Imaging
Radiometers Based on NUFFT Algorithm[J].Journal of Microwaves,2014,30(2):84-87. |
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| Authors: | CHEN Ke LAI Li HE Feng HU Fei LI Zhao yang |
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| Affiliation: | (1. Dept. of Electronics & Information Engineering , Huazhong University of Science & Technology, Wuhan, 430074,China;
2. National Key Laboratory of Science & Technology on Multi-spectral Information Processing, Wuhan 430074, China
3. Science and Technology on Millimeter-wave Laboratory,Beijing 100039,China) |
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| Abstract: | In order to further reduce the complexity of synthetic aperture interferometric radiometer imaging system,
the circular and rotating array configurations have been proposed. However, these array configurations suffer the extremely
complex brightness image reconstruction process. As the sampling data measured by these array configurations are distributed
in a non uniform grid, the conventional cartesian FFT method could not be used directly. This paper presents an Non uniform
Fast Fourier Transform(NUFFT) algorithm for imaging reconstruction of synthetic aperture radiometer. This algorithm relies
on a combination of the fast Gaussian gridding algorithm and the use of FFT on an oversampled grid. The numerical simula
tion results indicate that the proposed algorithm is accurate . |
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| Keywords: | antenna arrays SAIR NUFFT(non uniform FFT) non-uniform sampling |
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