电控时变电磁材料的SAR成像特性研究

王俊杰; 冯德军; 王志凇; 邢世其; 李永祯; 王雪松

doi:10.12000/JR21104

电控时变电磁材料的SAR成像特性研究

DOI: 10.12000/JR21104

1.
国防科技大学电子科学学院电子信息系统复杂电磁环境效应国家重点实验室长沙 410073
2.
中国人民解放军32200部队锦州 121000

基金项目: 国家自然科学基金(62071475, 61890542, 62001481)

详细信息

作者简介:
王俊杰(1991–)，男，博士，讲师，主要研究方向为新材料电磁调控、雷达信号处理与新型电子对抗

冯德军(1972–)，男，研究员，博士生导师，主要研究方向为智能电子对抗、精确制导与目标识别

王志凇(1988–)，男，硕士，主要研究方向为武器装备实验鉴定

邢世其(1984–)，男，博士，副研究员，主要研究方向为极化雷达成像、雷达信号处理与合成孔径雷达对抗

李永祯(1977–)，男，研究员，博士生导师，主要研究方向为极化雷达与电子对抗

王雪松(1972–)，男，教授，博士生导师，主要研究方向为极化雷达、目标识别与电子对抗

通讯作者:
王俊杰 wangjunjie14@vip.qq.com

冯德军 fdj117@sina.com

责任主编：丁泽刚 Corresponding Editor: DING Zegang
中图分类号: TN955
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出版历程
- 收稿日期: 2021-07-22
- 修回日期: 2021-10-14
- 网络出版日期: 2021-11-04
- 刊出日期: 2021-12-28

Synthetic Aperture Rader Imaging Characteristics of Electronically Controlled Time-varying Electromagnetic Materials

1.
The State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System, College of Electronic Science, National University of Defense Technology, Changsha 410073, China
2.
Unit 32200 of PLA, Jinzhou 121000, China

Funds: The National Nature Science Foundation of China (62071475, 61890542, 62001481)

More Information

Corresponding author: WANG Junjie, wangjunjie14@vip.qq.com; FENG Dejun, fdj117@sina.com

摘要

摘要: 微动目标因具有在不同方向的运动分量，能够对电磁波进行微多普勒调制，导致目标成像特征出现方位向散焦效应，这种现象在目标识别与反识别领域被广泛关注与研究。相较而言，电控时变电磁材料通过外加激励实现对电磁波特征的灵活调控，具有更快的调制速度，而其成像特性没有被过多关注。该文以此为切入点，对电控时变电磁材料的合成孔径雷达(SAR)图像距离向调制特性进行了研究，分析了时变电磁材料谱变换模型和SAR目标特征控制原理。以相位调制表面(PSS)为代表，建立了非周期PSS相位调制模型，其频谱具有连续频移特性。在此基础上，探讨了PSS连续频移调制对SAR的影响，揭露了距离向目标散焦现象。通过SAR实测数据仿真，验证了所提理论方法的有效性。
- 时变电磁材料 /
- 相位调制表面 /
- 非周期调制 /
- 谱变换 /
- 合成孔径雷达
Abstract: Micromotion targets can enable microDoppler modulation on electromagnetic waves owing to their motion components in different directions, resulting in the defocusing effects of the target imaging features along the azimuth direction. This phenomenon has been widely considered and investigated in target recognition and antirecognition. As a research hotspot, electronically controlled time-varying electromagnetic materials have fast modulation characteristics; however, their imaging characteristics have not received much attention. This study investigates the Synthetic Aperture Radar (SAR) modulation characteristics along the range direction of electronically controlled time-varying electromagnetic materials. Then, this study establishes the time-varying electromagnetic material spectrum transformation model and analyzes the SAR target characteristic control principle. Taking the Phase-Switched Screen (PSS) as an example, a nonperiodic PSS phase modulation model is established, and its spectrum has continuous frequency shift characteristics. On this basis, the influence of continuous frequency shift modulation induced by nonperiodic PSS on SAR was further discussed and the defocusing phenomenon of the target along the range direction was detected. Through the simulation of measured data, the validity of the proposed theoretical method is verified.
- Time-varying electromagnetic materials /
- Phase-Switched Screen (PSS) /
- Nonperiodic modulation /
- Spectrum conversion /
- Synthetic Aperture Radar (SAR)

HTML全文

图 1 电控时变电磁材料

Figure 1. Electronically controlled time-varying electromagnetic materials

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图 2 SAR成像模型

Figure 2. SAR imaging model

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图 3 非周期PSS相位调制波形

Figure 3. Nonperiodic PSS phase modulation waveform

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图 4 非周期PSS波形频谱特性

Figure 4. Spectrum characteristics of nonperiodic PSS waveform

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图 5 非周期PSS调制的匹配滤波输出

Figure 5. Nonperiodic PSS modulated matched filter output

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图 6 基于非周期PSS调制的SAR成像效果图

Figure 6. SAR imaging effect based on aperiodic PSS modulation

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