基于微多普勒效应的ISAR成像干扰新方法

本文从分析雷达目标微多普勒效应的产生机理出发，提出了针对ISAR成像的干扰新方法。一方面，针对现有基于微多普勒特征的雷达目标识别技术，干扰机将接收到的雷达信号进行移频和幅度调制处理后转发，生成虚假的微多普勒特征，实现对敌方雷达系统的欺骗干扰；另一方面，利用微多普勒效应对雷达回波的附加调制作用，干扰机发射虚假微多普勒信号，通过降低回波各次距离像之间的相关性和破坏距离像的初相信息，可有效干扰敌方成像系统的运动补偿处理，并在方位向生成干扰条带，对敌方ISAR系统形成“灵巧”抑制干扰，使其无法实现对目标的有效成像。仿真和实测数据处理均表明基于微多普勒效应的干扰方法可在较低干信比条件下实现对ISAR成像系统的有效干扰。

A Novel Jamming Method for Dechirping ISAR Based on Micro-Doppler Effect

A novel algorithm for ISAR (inverse synthetic aperture radar) jamming based on the micro-Doppler effect is proposed in the paper. A deception jamming method is presented first, in which the radar signals are repeated by the jammer with additional illusive micro-Doppler signatures after frequency-shift and amplitude-modulation. When receiving these jamming signals, the imaging radar will be confused. On the other hand, because of the additional modulation of the micro-Doppler effect to the radar echoes, the illusive micro-Doppler signals transmitted by the jammer can reduce the correlation between the range profiles, distort the initial phases, and form interference stripes along the azimuth direction. Therefore, another “smart” barrage jamming method is presented based on the micro-Doppler effect. The results of both simulated and measured data prove the effectiveness of these methods with relatively low jam-to-signal ratio.