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Anti-interrupted Sampling Repeater Jamming Method for Interpulse and Intrapulse Frequency-agile Radar
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摘要: 为提升雷达抗间歇采样干扰的能力，该文根据间歇采样转发干扰收发分时的特点，利用脉间-脉内捷变频波形的“主动”抗干扰优势，提出了一种基于分数阶傅里叶变换的并行干扰抑制方法。首先在时域对被干扰的子脉冲进行提取，并将提取到的信号进行切片处理，然后在分数阶傅里叶域利用窄带滤波器组对干扰进行抑制，最后构造匹配滤波器组进行分段脉冲压缩实现子脉冲积累。理论分析和仿真结果表明，所提方法可以有效对抗不同间歇采样干扰样式组成的多主瓣干扰，在高干信比条件下依然具有良好的抗干扰性能，极大提升了雷达的抗干扰能力。Abstract: To improve radar’s anti-Interrupted Sampling Repeater Jamming (ISRJ) capability, this study proposes a parallel interference suppression method based on the fractional Fourier transform, which uses the “active” anti-jamming capability of the interpulse and intrapulse frequency-agile waveform according to the characteristics of ISRJ transceiver splitting. First, the interfered sub-pulses are extracted in the time domain, and the extracted signals are sliced. Then, the narrowband filter banks are used to suppress the interference in the fractional Fourier domain. Finally, matching filter banks are constructed to achieve subpulse integration by applying segmented pulse compression. The theoretical analysis and simulation results show that the proposed method effectively suppresses multi-mainlobe interferences comprising different types of ISRJ and exhibits good anti-interference performance under a high jamming-to-signal ratio, which considerably improves the anti-jamming capability of the radar.
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图 2 脉间-脉内捷变频波形时频图
Figure 2. Time-frequency diagram of inter-and-intra-pulse frequency agile waveform
图 4 脉内捷变频回波信号时频图
Figure 4. Time-frequency diagram of intra-pulse frequency agile echo signal
图 5 LFM信号分数阶傅里叶域频谱特征
Figure 5. Spectral characteristics in fractional Fourier domain of LFM signal
图 6 分数阶傅里叶域并行干扰抑制流程图
Figure 6. Flow chart of parallel interference suppression in fractional Fourier domain
表 1 雷达波形参数设置
Table 1. Radar waveform parameter setting
参数 数值 参数 数值 脉冲数 $N$ 64 子脉冲数 $M$ 4 跳频数 $N$ 64 脉内跳频间隔 $\Delta {f_{\text{s}}}$ 5 MHz 脉间跳频间隔 $\Delta f$ 9 MHz 子脉冲带宽 ${B_{\text{s}}}$ 5 MHz 脉冲重复周期 ${T_{\text{r}}}$ 40 μs 子脉冲脉宽 ${T_{\text{s}}}$ 1 μs 中心载频 ${f_0}$ 14 GHz 采样率 ${f_{\text{s}}}$ 80 MHz 
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