间歇采样转发式干扰的时频域辨识与抑制

周超; 刘泉华; 胡程

doi:10.12000/JR18080

间歇采样转发式干扰的时频域辨识与抑制

DOI: 10.12000/JR18080

北京理工大学信息与电子学院雷达技术研究所北京 100081
北京市嵌入式实时信息处理技术重点实验室北京 100081

基金项目: 高等学校学科创新引智计划(B14010)，“长江学者奖励计划”(T2012122)

详细信息

作者简介:
周　超(1987–)，江苏扬州人，现为北京理工大学雷达技术研究所博士后，研究方向为雷达抗干扰、雷达目标检测跟踪算法。E-mail: 7520180050@bit.edu.cn

刘泉华(1982–)，福建永定人，现为北京理工大学雷达技术研究所副教授，研究方向为高分辨雷达系统及信号处理。E-mail: liuquanhua@bit.edu.cn

胡　程(1981–)，湖南岳阳人，现为北京理工大学雷达技术研究所研究员，博士生导师，研究方向为新体制雷达成像技术、雷达信号处理。E-mail: hucheng@bit.edu.cn

通讯作者:
刘泉华 liuquanhua@bit.edu.cn

中图分类号: TN972
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出版历程
- 收稿日期: 2018-09-25
- 修回日期: 2018-12-14
- 网络出版日期: 2019-02-28

Time-frequency Analysis Techniques for Recognition and Suppression of Interrupted Sampling Repeater Jamming

School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China
Key Laboratory of Embedded Real-time Information Processing Technology, Beijing 100081, China

Funds: The 111 Project of China (B14010), The Chang Jiang Scholar Program (T2012122)

More Information

Corresponding author: LIU Quanhua, liuquanhua@bit.edu.cn

摘要

摘要: 间歇采样转发式干扰利用数字射频存储器(DRFM)对雷达发射信号进行截获与转发，具有小型化、轻量化和灵活多变的优势，可搭载在目标上形成多点源主瓣干扰，对现代雷达构成了严重威胁。该文对上述干扰的辨识与抑制方法进行了研究。通过推导干扰脉冲压缩与时频分布的解析表达式，分析了目标回波与典型干扰信号的时频特征差异；在此基础上，提出一种时频域干扰辨识方法，并构造时频域滤波器进行干扰抑制。仿真结果表明：在原始信号干噪比大于–3 dB的情况下，算法辨识率可达90%；在此基础上，通过时频域滤波可以对3种典型策略下干扰都进行有效抑制，其峰值信干噪比改善可达18 dB。
- 转发式干扰 /
- 时频分析 /
- 干扰辨识 /
- 干扰抑制
Abstract: Through partial intercepting and multiple forwarding of a radar transmitting signal, Digital Radio Frequency Memory (DRFM)-based Interrupted Sampling Repeater Jamming (ISRJ) possesses advantages of small size, light weight, and flexibility. Thus, DRFM-ISRJ can be equipped on targets to perform multi-point source main-lobe jamming, posing a serious threat to modern radars. In this study, a time-frequency domain recognition and suppression method was analyzed. First, the expression of pulse compression and Time-Frequency Distribution (TFD) of the jamming signal were deduced. Then, the differences of TFD between target echo and jamming signal were analyzed. On this basis, a jamming recognition program and a time-frequency domain filter to suppress the jamming were proposed. Simulation results show that the recognition rate is better than 90% when the jamming-to-noise ratio is over –3 dB for the received signal. Based on correct recognition, a signal to jamming-and-noise ratio improvement of 18 dB can be achieved using the time-frequency filter.
- Repeater jammer /
- Time-frequency analysis /
- Jamming recognition /
- Jamming suppression

HTML全文

图 1 间歇采样转发式干扰工作原理示意

Figure 1. The principle of interrupted sampling repeater jamming

下载: 全尺寸图片幻灯片

图 2 基于时频分析的干扰辨识流程

Figure 2. The flow of jamming recognition with time-frequency analysis

下载: 全尺寸图片幻灯片

图 3 目标与干扰的脉冲压缩结果

Figure 3. Pulse compression of target and jamming signal

下载: 全尺寸图片幻灯片

图 4 目标与干扰脉压结果的时频分布

Figure 4. The time-frequency distribution of pulse compression result of target and jamming signal

下载: 全尺寸图片幻灯片

图 5 干扰辨识仿真结果

Figure 5. Simulation results of jamming recognition

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图 6 不同干扰策略下的干扰抑制结果

Figure 6. Jamming suppression results of different jamming strategies

下载: 全尺寸图片幻灯片

表 1 干扰辨识与抑制仿真参数

Table 1. Simulation parameters for jamming recognition and suppression

参数名参数值

发射信号 Chirp
信号带宽(MHz) 100
信号脉宽(μs) 10
采样率(MHz) 150
切片宽度(μs) 1～5
信干比(原始回波)(dB) –15

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