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Integrated Jamming Perception and Parameter Estimation Method for Anti-Interrupted Sampling Repeater Jamming
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摘要: 间歇采样转发干扰是一种脉内相干干扰，其形成的电子假目标与真实目标高度相似，对雷达目标检测造成了严重威胁。传统抗干扰方法较为被动，且没有考虑到干扰机策略的变化，在干扰抑制时难免会出现干扰残留以及信号损失的情况。为了提升雷达抗干扰性能，该文提出一种联合“干扰感知-参数估计-干扰抑制”的抗干扰方案。首先，利用双向-双滑窗脉冲沿检测和滑动截断匹配滤波方法，准确提取接收回波中的干扰分量并估计采样时长和周期等参数。在此基础上，重构出干扰信号分量并将其从回波中剔除，从而确保准确有效的目标检测。仿真实验表明，所提方法在不损失信号能量的情况下，对于不同调制方式下的间歇采样转发干扰都具有较好的抑制效果。当干噪比为9 dB时，干扰抑制后信干比提升大于33 dB，保证了雷达稳健的抗干扰性能。Abstract: Interrupted Sampling Repeater Jamming (ISRJ) is a type of intra-pulse coherent jamming that can easily generate false targets resembling real ones, thus posing a severe threat to radar systems. Traditional methods for countering ISRJ techniques are relatively passive and often fail to adapt to evolving jamming techniques, leading to residual jamming effects and signal loss. To improve radar’s anti-jamming capabilities, a novel scheme integrating “jamming perception, parameter estimation, and jamming suppression” has been developed in this study. This method begins by using a bidirectional double sliding window pulse edge detector and a sliding truncated matched filter. These devices are used to extract the ISRJ components of received radar signals and accurately estimate the parameters such as sampling duration and period. The jamming components are then reconstructed and eliminated, allowing for effective target detection. Simulation experiments demonstrate that the proposed method effectively overcomes ISRJ across different modulation modes with almost no loss of signal energy. When the jamming-to-noise ratio is 9 dB, the method boosts the signal-to-jamming ratio by over 33 dB after jamming suppression, ensuring robust anti-ISRJ performance.
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图 3 双向-双滑窗脉冲检测示意图
Figure 3. Schematic diagram of bidirectional dual-window pulse edge detection
图 7 ISPRJ脉冲检测与参数估计结果
Figure 7. Pulse edge detection and parameter estimation results of echo with ISPRJ
图 9 LFM波形干扰抑制前后回波时频分布情况
Figure 9. TFD of received echo before and after anti-jamming of LFM waveform
图 10 LFM波形干扰抑制前后回波脉压结果
Figure 10. PC results of received echo before and after anti-jamming of LFM waveform
图 12 性能指标随参数估计误差变化曲线
Figure 12. The variation curves of performance index with parameter estimation error
图 13 LFM波形不同方法干扰抑制后脉压结果对比图
Figure 13. Comparison of PC results after anti-jamming by different methods of LFM waveform
图 14 LFM波形下SJRIF随JSR变化曲线
Figure 14. The variation curves of SJRIF with JSR for LFM waveform
图 15 LFM波形下SLR随JSR变化曲线
Figure 15. The variation curves of SLR with JSR for LFM waveform
图 16 捷变波形干扰抑制前后回波时频分布情况
Figure 16. TFD of received echo before and after anti-jamming of agile waveform
图 17 捷变波形干扰抑制前后回波脉压结果
Figure 17. PC results of received echo before and after anti-jamming of agile waveform
图 18 捷变波形下SJRIF随JSR变化曲线
Figure 18. The variation curves of SJRIF with JSR for agile waveform
图 19 捷变波形下SLR随JSR变化曲线
Figure 19. The variation curves of SLR with JSR for agile waveform
图 20 相位编码波形干扰抑制前后回波脉压结果
Figure 20. PC results of received echo before and after anti-jamming of phase-coded waveform
图 21 相位编码波形下性能指标随JSR变化曲线
Figure 21. The variation curves of performance index with JSR for phase-coded waveform
表 1 雷达与目标参数
Table 1. Radar and target parameters
参数 数值 脉冲宽度T 24 μs 信号带宽B 36 MHz 采样率${f_{\text{s}}}$ 72 MHz 脉冲重复周期${\text{PRI}}$ 100 μs 中心载频${f_{\text{c}}}$ 3 GHz 目标距离R 9 km 
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表 2 干扰机参数
Table 2. Jammer parameters
参数 数值 干扰转发时延${\tau _{\text{J}}}$ 0 μs 干扰采样时长${T_{\text{I}}}$ 2 μs 干扰采样周期${T_{\text{J}}}$ 8 μs 转发次数M 3 信噪比SNR 3 dB 干信比JSR 6 dB
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