旋转微运动ISAR成像及干扰特性分析

Characteristics analysis of targets with rotational micro-motion in ISAR imaging and jamming

旋转微运动引起多普勒正弦规律变化,进而影响目标逆合成孔径雷达(inverse synthetic aperture ra-dar,ISAR)成像结果。利用散射点模型,对单个旋转微动进行了几何、回波建模,用距离-多普勒算法推导出旋转微动点成像结果。详细分析了旋转微动ISAR图像特征和图像形状,指出不同参数下旋转微动可形成幅度受第一类贝塞尔函数调制、方位向上等间隔分布的直线段型、直线点列型、条带型以及点阵型图像,并给出了以上图像的形成条件。仿真实验和实测数据均验证了理论分析的正确性,研究结果为方位向调制形成二维ISAR干扰提供理论支撑。

The sinusoidal micro-Doppler（m-D） effect caused by rotating parts of the radar target may contaminate the inverse synthetic aperture radar（ISAR） imaging.Based on the point-scattering model,the geometrical model and signal model for the rotational micro-motion are built,and the output image is derived.The results indicate that the ISAR image of a target with rotating parts in various motion parameters can be in the form of a line,a line of points,line strips or a set of points with the amplitude affected by the Bessel function.Moreover,the formative conditions of these different image forms are obtained.The analyses are verified by numerical simulation and measured data.The research is useful in ISAR cross-range modulation jamming.