基于压缩感知信号重构的宽带LFM雷达抗间歇采样转发干扰方法

A Method of Wide-band LFM Radar against Interrupted-sampling Repeater Jamming Based on Compressed Sensing Signal Reconstruction

间歇采样转发干扰可以对宽带线性调频(LFM)雷达形成逼真多假目标以及具有压制效果的密集假目标干扰效果,从而影响对目标的识别和分类。根据间歇采样转发干扰“存储-转发-存储-转发”的干扰特点,利用能量函数提取未受干扰影响的目标回波信号数据,并将其看作目标回波信号的压缩数据,然后利用其与去斜处理后的目标回波信号稀疏频域之间的线性关系,构建了压缩感知最小问题求解模型;最后,利用正交匹配追踪算法重构了目标回波信号的一维高分辨距离像,实现了对ISRJ干扰的抑制和对目标一维高分辨距离像的提取。仿真结果表明:在一定的干扰参数条件下,本文所提方法可以较为准确地重构出目标一维高分辨距离像。

Lifelike multiple false targets and dense false targets which have suppression result to the the wide-band linear frequency modulation(LFM)radar can be made by interrupted-sampling repeater jamming(ISRJ),which affects the classification and recognition of targets.According to the characteristics of‘storage-repeater-storage-repeater’of the ISRJ,the target echo data not disturbed by the jamming signal is extracted by using the energy function and is treated as the compressed data of target echo signal.Then a compressed sensing minimization resolution model is established based on the linear relationship between the compressed data and the sparse frequency domain of the target echo signal after dechirp processing.At last,the orthogonal matching pursuit(OMP)algorithm is utilized to reconstruct the 1-D high resolution range profile(HRRP)of target echo signal,which means the ISRJ is suppressed and the 1-D HRRP of target is extracted simultaneously.The simulation result shows that the method proposed in this paper can reconstruct the target’s 1-D HRRP accurately under the condition of certain interference parameters.