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Anti-interrupted Sampling Repeater Jamming Method Based on Frequency-agile Radar Joint Fuzzy C-means
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摘要: 间歇采样噪声调制转发干扰是一种兼具压制和欺骗特点的新型有源干扰，是目前雷达抗干扰领域的难点之一。为了提高捷变频雷达对抗噪声调制的间歇采样转发干扰(ISRJ)的能力，该文结合ISRJ时域不连续的特点，提出一种基于频率捷变体制雷达联合模糊C均值(FCM)的抗ISRJ方法。首先，该文设计一种脉内频率编码-脉间频率捷变的雷达发射波形；雷达接收到回波信号后，通过频域窄带滤波得到不同脉内频率编码对应的子脉冲信号；然后利用FCM算法判断脉冲压缩后的子脉冲中是否含有干扰；最后，通过压缩感知(CS)算法实现脉间频率跳变波形的相参积累。理论分析和仿真实验证明该算法可以有效对抗ISRJ。Abstract: Intermittent sampling noise modulation and forward jamming is a novel active jamming method with both suppression and deception characteristics and is a challenge often encountered in radar anti-jamming. To improve the capability of frequency-agile radar to resist noise-modulated Intermittent Sampling Repeater Jamming (ISRJ), we propose an anti-ISRJ method based on frequency-agile radar joint Fuzzy C-Means (FCM). First, we designed a radar-transmitted waveform with intra pulse frequency coding and inter pulse frequency agility. Second, after receiving the echo signal, we obtained the sub pulse signals corresponding to different intra-pulse frequency codes via narrow-band filtering in the frequency domain. Third, we adopted the FCM algorithm to determine the presence of ISRJs in the sub pulses after pulse compression. Finally, we realized the phase-coherent accumulation of inter pulse frequency-hopping waveform using the compressed sensing algorithm. Theoretical analysis and simulation experiments showed that the proposed method can effectively resist ISRJ.
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图 3 本文设计波形的模糊函数图
Figure 3. Ambiguity function diagram of the waveform designed in this paper
图 4 多普勒频率与距离模糊图主旁瓣比的关系曲线
Figure 4. Relationship curve between Doppler frequency and the main sidelobe ratio of distance fuzzy graph
图 5 所提方法对ISRJ-DF的对抗效果图
Figure 5. Antagonistic effect diagram of the proposed method against ISRJ-DF
图 6 所提方法对ISRJ-RF的对抗效果图
Figure 6. Antagonistic effect diagram of the proposed method against ISRJ-RF
图 7 不同信噪比下FCM算法对ISRJ的判决准确率
Figure 7. Judgment accuracy of FCM algorithm for ISRJ under different SNR
图 8 二维稀疏重构后不同算法的输出信干比
Figure 8. Output SJR of different methods after 2-D sparse reconstruction
表 1 雷达参数
Table 1. Radar parameters
参数 数值 参数 数值 N 64 K 10 M 100 f0 14 GHz $\Delta $f 12 MHz $\Delta F $ 40 MHz Tsub 4 µs Bsub 4 MHz PRT 100 µs 
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