捷变频雷达联合脉内频率编码抗间歇采样干扰

间歇采样转发干扰通过对雷达信号进行部分采样并迅速转发, 在当前脉冲重复周期内, 产生相干假目标串, 使得基于传统频率捷变雷达的目标检测面临严峻挑战。因此, 在频率捷变技术基础上提出一种捷变频雷达联合脉内频率编码的抗间歇采样干扰方法。针对间歇采样干扰时域不连续的特点, 通过脉内频率编码-脉间频率捷变实现子脉冲间的相互掩护。脉冲压缩后, 首先利用最大类间方差法(Otsu)自适应计算阈值并抑制干扰, 然后通过二维稀疏重构方法实现目标检测。理论分析和仿真实验证明所提方法可以有效对抗间歇采样干扰。

Frequency agile radar combined with intra-pulse frequency coding to resist intermittent sampling jamming

Intermittent sampling repeater jamming can produce coherent false targets in the current pulse repetition period by partially sampling and rapidly forwarding the radar signal, making the target detection based on traditional frequency agile radar face severe challenges. Therefore, an anti-intermittent sampling jamming method based on frequency agility radar and intra-pulse frequency coding is proposed. Aiming at the time-domain discontinuity of intermittent sampling jamming, the inter-pulse frequency agility and intra-pulse frequency coding are used to realize the mutual protection between sub-pulses. After pulse compression, Otsu is used to adaptively calculate the threshold and suppress the jamming firstly. And then the detection of targets is realized by the two-dimensional sparse reconstruction method. Theoretical analysis and simulation results show that the proposed method can effectively resist intermittent sampling jamming.