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具有空时自适应处理技术(STAP)的机载雷达从空时二维联合域处理信号,而传统干扰方法因信号维度单一性很难产生有效干扰效果。文中针对STAP处理器抗干扰特性,提出一种具有空时二维特性的投散射式伪杂波干扰新技术,根据多普勒频率对方位的依从关系,向地面投射干扰信号,利用地面散射特性产生与地杂波特性相似的伪杂波干扰信号。分析了该干扰信号的空时矢量模型,研究了干扰信号二维功率谱的轨迹可控性问题。该干扰信号在空时二维空间上呈现不与杂波轨迹重合的刀背式分布,多普勒轨迹可控,能控制干扰信号的二维功率谱始终覆盖在被保护目标上。仿真实验结果显示:处理器改善因子降低,杂波谱畸变,证明了该干扰方法的有效性。
Airborne radar with space-time adaptive processing (STAP) processes signals from the space-time two-dimensional joint domain, whereas traditional interference methods are difficult to produce effective interference due to the unity of signal dimensions. Aiming at the anti-interference characteristic of STAP processor, this paper proposes a novel scattering-type pseudo-clutter jamming technique with space-time two-dimensional characteristics. According to the compliance of the Doppler frequency to the azimuth, an interfering signal is projected onto the ground. A pseudo-clutter interference signal similar to that of ground clutter is generated. The space-time vector model of the jamming signal is analyzed and the trajectory controllability of the two-dimensional power spectrum of the jamming signal is studied. The jamming signal presents a dorsal-type distribution that does not coincide with the clutter trajectory in two-dimensional space-time, and the Doppler trajectory is controllable. The two-dimensional power spectrum that can control the interference signal always covers the protected target. The simulation results show that the improvement factor of the processor is reduced and the clutter spectrum is distorted, which proves the effectiveness of the jamming method.