一种具有宽角域调控的非周期时间调制角反射器设计及其雷达目标特征变换方法  

Design of an aperiodic time-modulated corner reflector with wide-angle domain regulation and its radar target feature transformation method

作　　者：孙光 王俊杰[1] 邢世其[1] 王福来 冯德军[1] 庞礴[1] 李永祯[1] 王雪松[1] Guang SUN;Junjie WANG;Shiqi XING;Fulai WANG;Dejun FENG;Bo PANG;Yongzhen LI;Xuesong WANG(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)

机构地区：[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

出　　处：《中国科学：信息科学》2023年第12期2543-2560,共18页Scientia Sinica(Informationis)

基　　金：国家自然科学基金(批准号:62201589,61971429,61901499)资助项目。

摘　　要：时间调制超表面因其可以对入射电磁波进行实时动态地调控,在未来信息领域具有显著的应用潜力.但是时间调制超表面在雷达对抗中的应用却很少被研究,而且由于镜像原理,实现宽角域范围内的单站RCS调控也是其面临的一个关键问题.本文将具有不同于传统周期编码方式的时间调制超表面与角反射器相结合,首次提出了一种基于非周期时间调制超表面的时间调制角反射器,可以在宽角域范围内操控入射电磁波的谐波频谱分布,产生连续的多普勒频移.基于此,进一步探索了非周期时间调制角反射器在雷达中的变换效果,揭示了非周期调制可以沿距离向产生连续的虚假谐波峰值,形成干扰条带.最后,利用半实物雷达系统对时间调制角反射器的高分辨距离像进行了实验测试,验证了所提结构的准确性和理论方法的有效性.Time-modulated metasurfaces have considerable potential for future applications in the information field because they can dynamically control incoming electromagnetic waves in real time.However,their application in radar countermeasures is seldom studied.Due to the mirror principle,it is also a key problem to realize monostatic RCS control in wide-angle domains.In this paper,a time-modulated corner reflector based on an aperiodic time-modulated metasurface is proposed for the first time by combining the time modulated metasurface with the corner reflector,which differs from the traditional periodic encoding method so that it can control the harmonic spectrum distribution of incident electromagnetic waves in a wide-angle domain to generate a continuous Doppler frequency shift.On this basis,the transformation effect of an aperiodic time-modulated corner reflector in radar is further explored.Aperiodic modulation is found to produce continuous false harmonic peaks along the range direction,forming interference stripes.Finally,the high-resolution range profile of the time-modulated corner reflector is tested using a semiphysical radar system,verifying the accuracy of the proposed structure and the effectiveness of the theoretical method.

关 键 词：时间调制超表面 角反射器 宽角域 谐波操控 雷达目标特征变换 

分 类 号：TN957.51[电子电信—信号与信息处理]