频率捷变波形联合时频滤波器抗间歇采样转发干扰

doi:10.12305/j.issn.1001-506X.2023.12.11

摘要/Abstract

摘要：

干扰机在一个脉冲内精确复制、快速转发形成间歇采样转发干扰(interrupted-sampling repeater jamming, ISRJ), 严重影响雷达工作性能。针对这一问题, 从波形设计和滤波两个角度出发, 提出一种频率捷变波形联合时频滤波器对抗间歇采样转发干扰的方法。首先, 将常规线性调频(linear frequency modulation, LFM)信号划分为若干子段并随机重排, 构建脉内频率捷变波形; 然后, 对回波信号进行时频分析得到时域投影分量, 并利用大津(OTSU)算法计算最佳分割阈值, 提取未被干扰的信号段; 最后, 通过卷积运算构建滤波器对脉压输出进行带通滤波, 保留真实目标, 实现干扰抑制。仿真结果表明, 所提方法能够在干扰功率较大、信噪比低的情况下有效对抗间歇采样转发干扰, 极大地提升了雷达抗干扰性能。

关键词: 电子对抗, 间歇采样转发干扰, 频率捷变, 时频滤波

Abstract:

In a pulse, jammers precisely replicate and rapidly forward to form interrupted-sampling repeater jamming (ISRJ), which seriously affects the performance of radar. Aiming at this problem, this paper starts from waveform design and filtering and then proposes a method of frequency agility waveform combined time-frequency filter to suppress ISRJ. Firstly, the conventional linear frequency modulation (LFM) signal is divided into several segments and randomly rearranged to construct the intra pulse frequency agility waveform. Secondly, the time domain projection component is obtained by time-frequency analysis of the echo signal, and the optimal segmentation threshold is calculated by OTSU algorithm to extract the undisturbed signal segment. Finally, a filter is constructed by convolution operation to perform band-pass filtering on pulse pressure output to preserve the real target and achieve the interference suppression. Simulation results show that the proposed method can effectively suppress the ISRJ under the condition of high jamming power and low signal-to-jamming-and-noise ratio, which greatly improves the radar anti-jamming performance.

Key words: electronic countermeasures, interrupted-sampling repeater jamming (ISRJ), frequency agility, time-frequency filtering

中图分类号:

TN972

杜思予, 刘智星, 吴耀君, 沙明辉, 全英汇. 频率捷变波形联合时频滤波器抗间歇采样转发干扰[J]. 系统工程与电子技术, 2023, 45(12): 3819-3827.

Siyu DU, Zhixing LIU, Yaojun WU, Minghui SHA, Yinghui QUAN. Frequency agility waveform combined with time-frequency filter to suppress interrupted-sampling repeater jamming[J]. Systems Engineering and Electronics, 2023, 45(12): 3819-3827.

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参数	数值	参数	数值
脉冲数	64	子脉冲数	8
带宽/MHz	48	子带宽/MHz	6
脉宽/μs	8	子脉宽/μs	1
载频/GHz	14	采样率/MHz	96
跳频带宽/MHz	9	目标距离/m	4 000
重频/MHz	25	信噪比/dB	0

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