合成孔径雷达二维失配压制干扰方法

摘要

In order to protect a distributed target or an important area, a bi-dimensional mis-matching suppressed jamming for countering Synthetic Aperture Radar ( SAR ) is proposed. With the jammer the signal transmitted is intercepted from SAR, and a chirp signal is modulated with changing central frequency, then is amplified and retransmitted to SAR. The output expres-sion of the range and azimuth jamming signal is derived, and the relationship is analyzed be-tween the mismatched signals which are caused by modulated parameters, and the location, am-plitude, width of the pulse compression output. Theoretical analysis and the simulation results indicate that the mismatched jamming signal could produce a flat shape suppressed jamming are-a, which could achieve effective protection of the distributed target or an important target.%为了给分布式目标提供有效的保护，提出了一种针对SAR的距离向、方位向脉冲失配压制干扰方法。干扰机根据目标在距离向的范围与位置对截获SAR信号调制一个中心频率可变的线性调频信号。推导了距离向脉压输出的主瓣位置、幅度以及失配宽度；分析了由于中心频率变化产生的方位向等效调制信号，给出了干扰机位置、调制参数与方位向脉压输出位置、幅度以及主瓣展宽量的关系。理论研究与仿真表明，干扰信号能够在SAR图像中形成面状压制区，可以实现对分布式目标的有效保护。