旋转微动目标的SAR成像特性分析  

Analysis of SAR Imaging Characteristics of Targets with Rotational Micro-Motion

作　　者：吴晓芳[1] 刘阳[1] 王雪松[1] 卢焕章[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《宇航学报》2010年第4期1181-1189,共9页Journal of Astronautics

基　　金："十一五"武器装备预先研究项目(513040305);国家自然科学基金(60672033)

摘　　要：旋转因具有不同方向上的运动分量而对SAR回波具有复杂的多普勒调制作用,进而形成特殊的成像结果。详细分析了旋转微动目标的SAR图像特征、图像形式以及位置关系,指出不同运动参数的旋转微动目标可形成方位向上等间隔分布的、幅度受第一类贝塞尔函数调制的互相独立、交接或交错的直线型、直线点列型、直线条带型以及直线圆列型图像,并给出了以上图像形式和位置关系的形成条件;实验验证了理论分析的正确性。该研究结果深化了对旋转微动目标的SAR成像特性的认识,可有助于判定旋转微动目标的存在,为其特征提取奠定基础。The rotation has a complex Doppler Effect on SAR echo because of the motion components in different directions.The image features,output forms and position features are analyzed in detail.The results indicate that the SAR image of a rotational target in the ground with various motion parameters can be in the form of a line,a line of points,a line strip or a line of circles,and can be mutual independent,connected or interlaced,where it is uniformly-spaced in the azimuth direction with the amplitude affected by Bessel function.Moreover,the formative conditions of these different forms and positions are given.The analyses are verified by simulation and outfield experiments.The research is very useful for understanding the SAR image characteristics and further extracting motion features of targets with rotational micro motions and feature extractions,and can be used to determine whether there is a rotational target.

关 键 词：SAR 旋转微动 方位向 正弦调制 像元 

分 类 号：TN985[电子电信—信息与通信工程]