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Dense-repeated Jamming Suppression Algorithm Based on the Support Vector Machine for Frequency Agility Radar
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摘要: 密集转发干扰与雷达发射信号高度相关，兼具压制式和欺骗式干扰效果，使雷达系统难以检测到真实目标，严重威胁雷达作战能力。针对这一问题，该文提出一种基于支持向量机(SVM)的捷变频雷达密集转发干扰智能抑制方法。通过对随机样本集进行离线训练获得最优SVM模型，智能化识别并分类目标和干扰；然后，采用平滑滤波进一步抑制目标所在距离单元内的干扰信号；最后，基于压缩感知(CS)理论进行二维高分辨重构，估计出目标参数信息。仿真实验与实测数据处理结果表明，所提算法在不同场景下均能够有效抑制密集转发干扰，准确检测出真实目标。Abstract: Dense-repeated jamming is highly related to the radar-transmitted signal, and it has suppression and deception jamming effects, which makes detecting the real target difficult for a radar system and seriously threatens the operational capability of radar. To solve this problem, an intelligent suppression method based on the Support Vector Machine (SVM) is proposed in this paper. The optimal SVM model is obtained through offline training on a random sample set to intelligently identify and classify targets and interference. Then, the interference sidelobe in the target range unit is further suppressed by smoothing filtering. Finally, high-resolution two-dimensional reconstruction is performed based on Compress Sensing (CS) theory to estimate the target parameter information. Simulation experiments and measured data processing results reveal that the proposed algorithm can effectively suppress dense-repeated jamming and accurately detect real targets in different scenarios.
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图 4 匹配滤波数据空间分布特征
Figure 4. Matching filtering data spatial distribution characteristics
图 11 分类准确率随训练样本比例变化曲线
Figure 11. The curve of classification accuracy changing with the proportion of training set
图 13 不同算法在不同JSR下的检测概率
Figure 13. Detection probability of different algorithmsunder different JSR
图 14 不同虚警率下检测概率随JSR变化曲线
Figure 14. The curve of detection probability changing with JSR under different false alarm rates
表 1 雷达参数
Table 1. Radar parameters
参数 数值 参数 数值 脉冲数Q 64 脉冲重复周期Tr 40 μs 信号脉宽Tp 4 μs 信号带宽B 20 MHz 初始载频fc 14 GHz 跳频间隔$ \Delta f$ 9 MHz 采样率fs 40 MHz 
下载: 导出CSV
表 2 外场试验参数
Table 2. Outfield experiment parameters
参数 数值 参数 数值 脉冲数Q 128 脉冲重复周期Tr 250 μs 信号脉宽Tp 4 μs 信号带宽B 20 MHz 跳频总数$Q' $ 256 载频跳变范围 33.2～34.2 GHz 采样率fs 60 MHz
下载: 导出CSV
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