提出了一种对SAR-GMTI 灵巧遮蔽干扰方法。该方法通过匀加速运动调制实现方位向干扰的同时,对SAR 信号进行余弦调相实现距离向干扰,将二者结合可在成像中形成区域遮蔽干扰效果,并以三通道干涉对消技术为例分析了其对多通道GMTI 的对抗性能。该方法的优点有两个:一是遮蔽区域大小和位置均可以通过改变干扰参数进行灵活控制;二是干扰信号与SAR 的距离向和方位向滤波器是基本匹配的,所需的干扰功率比较小。仿真实验证明了该方法对SAR 成像和SAR鄄GMTI 成像均具有很好的干扰效果。

A smart area shading jamming method is presented for SAR-GMTI. Along azimuth jamming could be obtained by uniformly-accelerating modulation of SAR signal and along range jamming could be obtained by cosine phase modulation of SAR signal. The combination of them provides a smart area shading jamming. Then, the countering performance against GMTI is analyzed by using the tri-channel interference cancelling technique. The advantage of this method can be divided into two parts: first, the position and the square of area can be controlled by jamming parameters; second, the power of jamming signal is low, because the signal is nearly matching to azimuth and distance filter. Simulation results verify its effectiveness both for SAR and SAR-GMTI.

TN957

国家自然科学基金资助项目