对合成孔径雷达的转发式扫频干扰技术研究

Research on SAR Repeater Sweep Jamming Technology

对合成孔径雷达(SAR)的干扰技术进行了系统的研究,在对余弦转发式干扰和伪装遮盖干扰进行详细理论分析和计算机仿真的基础上提出了一种新的干扰方法——转发式扫频干扰,该方法通过转发调制了扫频信号的SAR回波,使得SAR回波在距离向频域不能实现压缩,破坏了合成孔径雷达的自聚焦能力。理论研究表明,这几种方法均可以在低干信比的条件对SAR进行有效干扰,使其不能成像,从而达到掩护分布式目标的目的。通过对汽车模型成像的干扰仿真,验证了这些方法的有效性和可行性。

The jamming technology of synthetic aperture radar （SAR） is studied systematically Based on the detailed theatrical analysis and simulation of the cosine repeater jamming and the phase covering camouflage jamming,a new method is proposed for SAR jamming, which is the repeater sweep jamming. The method modulates sweep frequency signal SAR echo by repeater, and it makes SAR echo not be compressed in range domain, so that this method has a potential to disturb auto focus algorithm. Theoretical analysis shows these methods can effectively jam SAR in the condition of low JSR to make it not image and protect distributed important target. Finally, these methods are proved effective and feasible by simulation of car model.