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

被引：0
|
作者：
Wang J. [1 ]
Feng D. [1 ]
Wang Z. [2 ]
Xing S. [1 ]
Li Y. [1 ]
Wang X. [1 ]
机构：
[1] State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System, College of Electronic Science, National University of Defense Technology, Changsha
[2] Unit 32200 of PLA, Jinzhou
来源：
Journal of Radars | 2021年 / 10卷 / 06期
关键词：
Nonperiodic modulation; Phase-Switched Screen (PSS); Spectrum conversion; Synthetic Aperture Radar (SAR); Time-varying electromagnetic materials;
D O I：
10.12000/JR21104
中图分类号：
学科分类号：
摘要：
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. © 2021 Institute of Electronics Chinese Academy of Sciences. All rights reserved.
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页码：865 / 873
页数：8
相关论文
共 32 条
  • [1] CHEN V C, LI F, HO S S, Et al., Micro-Doppler effect in radar: Phenomenon, model, and simulation study[J], IEEE Transactions on Aerospace and Electronic Systems, 42, 1, pp. 2-21, (2006)
  • [2] ZHUANG Zhaowen, LIU Yongxiang, LI Xiang, The achievements of target characteristic with micro-motion[J], Acta Electronica Sinica, 35, 3, pp. 520-525, (2007)
  • [3] WU Xiaofang, LIU Yang, WANG Xuesong, Et al., Analysis of SAR imaging characteristics of targets with rotational micro-motion[J], Journal of Astronautics, 31, 4, pp. 1181-1189, (2010)
  • [4] BAI Xueru, SUN Guangcai, ZHOU Feng, Et al., A novel ISAR jamming method based on rotating angular reflectors[J], Chinese Journal of Radio Science, 23, 5, pp. 867-872, (2008)
  • [5] F o c u s i s s u e: N e g a t i v e r e f r a c t i o n a n d metamaterials, Optics Express, 11, 7, (2003)
  • [6] YEN T J, PADILLA W J, FANG N, Et al., Terahertz magnetic response from artificial materials[J], Science, 303, 5663, pp. 1494-1496, (2004)
  • [7] PADILLA W J., Group theoretical description of artificial electromagnetic metamaterials[J], Optics Express, 15, 4, pp. 1639-1646, (2007)
  • [8] TENNANT A, CHAMBERS B., Adaptive radar absorbing structure with PIN diode controlled active frequency selective surface[J], Smart materials and Structures, 13, 1, pp. 122-125, (2004)
  • [9] HUANG Cheng, ZHAO Bo, SONG Jiakun, Et al., Active transmission/absorption frequency selective surface with dynamical modulation of amplitude[J], IEEE Transactions on Antennas and Propagation, 69, 6, pp. 3593-3598, (2021)
  • [10] CHAMBERS B, TENNANT A., The phase-switched screen[J], IEEE Antennas and Propagation Magazine, 46, 6, pp. 23-27, (2004)
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