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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-GMTI成像均具有很好的干扰效果。
A method to mask the SAR-GMTI smartly is proposed. The method achieves the directional interference by uniform acceleration motion modulation and the cosine phase modulation of the SAR signal to achieve the distance interference. Combining the two can form a regional shadowing interference effect in the imaging. Taking the three-channel interference cancellation technique as an example Its confrontation performance with multi-channel GMTI was analyzed. The method has two advantages: First, the size and location of the shaded area can be flexibly controlled by changing interference parameters; secondly, the distance and azimuth filters of the interference signal and the SAR are basically matched, and the required interference power is compared small. Simulation results show that this method has a good interference effect on SAR imaging and SAR-GMTI imaging.