近程毫米波合成孔径辐射计成像算法  

Near Sensing Millimeter Wave Synthetic ApertureRadiometer Imaging Algorithms

作　　者：王本庆[1] 李兴国[1] 

机构地区：[1]南京理工大学毫米波光波近感技术研究所,江苏南京210094

出　　处：《电子学报》2009年第6期1353-1356,共4页Acta Electronica Sinica

摘　　要：针对近程毫米波合成孔径辐射计成像存在非线性相位项和像差等因素影响而使图像模糊和分辨率降低的问题,在分析合成孔径成像和衍射成像的相似性的基础上,把衍射成像算法中的分数阶傅立叶变换和拉冬-魏格纳变换引入近程成像,通过在时频平面的相关和坐标旋转减小非线性相位项的影响,改善成像质量.同时提出了基于互强度传播方程的近程成像算法,通过两次傅立叶变换来消除成像模糊问题,同样提高成像质量.Abstract：Since the effect of nonlinear phase factor and aberration which result in image blurring and resolution reducing in Millimeter wave synthetic aperture radiometer （MMW-SAR） near sensing imaging, the fractional Fourier transform （FRFT） and Radon-Wigner transform （RWT） using in diffraction imaging are introduced based on analyses the comparability between MMW-SAR passive imaging and the optical diffraction patterns. Through correlation and coordinate rotation on the time-frequency plane, the introduced algorithms reduce the impact of nonlinear phase and improve image quality. And mutual coherence function propagation equation （MCFPE） is also raised into MMW-SAR near sensing imaging,which can eliminate the fuzzy problem of imaging through twice Fourier transform and improve the imaging quality.

关 键 词：毫米波辐射计 合成孔径 近程成像 互强度传播方程 分数阶FOURIER变换 RADON-WIGNER变换 

分 类 号：TN911.7[电子电信—通信与信息系统]