基于捷变频联合数学形态学的干扰抑制算法

Interference suppression algorithm based on frequency agility combined with mathematical morphology

数字射频存储器(digital radio frequency memory,DRFM)通过截获雷达发射信号并对其进行调制和转发,在距离维上形成欺骗式干扰,严重影响了雷达对目标的检测与跟踪。针对这一问题,提出一种捷变频联合数学形态学的密集假目标干扰抑制算法。首先,采用最大类间方差法(Otsu)对脉冲压缩后的数据进行二值化处理。然后,通过数学形态学中的开运算抑制干扰和噪声。最后,通过二维稀疏重构获得距离速度二维高分辨,实现对目标的检测。仿真实验与实际雷达和干扰机对抗实验表明,该方法可以获得良好的抗干扰性能和目标检测性能。

The digital radio frequency memory(DRFM)intercepts the radar transmitted signal and modulates and forwards it,forming deceptive interference on the range dimension,which seriously affects the radar’s detection and tracking of targets.Aiming at the problem,a dense false target interference suppression algorithm based on frequency agility combined with mathematical morphology is proposed.Firstly,the pulse-compressed data is binarized by the Otsu method.Then,the opening operation of mathematical morphology is used to suppress the interference and noise.Finally,the range-velocity high resolution is realized and the detection of the target is achieved by 2-dimensional sparse reconstruction.Simulations and actual radar with jammers experiments show that the method proposed can obtain good anti-interference performance and target detection performance.