Time-Varying Reflectivity Modulation on Inverse Synthetic Aperture Radar Image Using Active Frequency Selective Surface

被引:0
|
作者
Xu, Yong [1 ]
Sui, Ran [1 ]
Wang, Junjie [1 ]
Feng, Dejun [1 ]
机构
[1] Natl Univ Def Technol, State Key Lab Complex Electromagnet Environm Effe, Changsha 410073, Peoples R China
基金
中国国家自然科学基金;
关键词
reflectivity modulation; inverse synthetic aperture radar (ISAR); active frequency selective surface (AFSS); ABSORBER; DESIGN; ISAR;
D O I
10.3390/electronics11203318
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
Interrupted-sampling repeater modulation (ISRM) can generate multiple virtual target images by sampling and forwarding radar signals to confront the inverse synthetic aperture radar (ISAR). However, the repeating delay is unavoidable and the system is complex. Moreover, numerous works mainly discuss the ISAR image deception based on periodic modulation, and the modulation effect is relatively limited. Active frequency selective surface (AFSS) can perform intermittent amplitude modulation to the reflected signal by varying target reflectivity, thus, it can achieve the function of ISRM. In this paper, the possibility of AFSS applied in the multiple virtual target generation is discussed, and an ISAR image-modulation method is proposed. The radar signal is periodically modulated by varying target reflectivity, which is accomplished by the AFSS-loaded PIN diodes. On this basis, the AFSS modulating frequency is randomly varied in a slow time domain. When the modulation signal is processed by the ISAR system, the produced target image is unfocused and cannot be recognized by radar. Simulation results are utilized to demonstrate the effectiveness of the proposed method.
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页数:8
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