超材料压缩感知成像技术  

Compressive Sensing imaging technology based on metamaterial

作　　者：白佳俊[1] 陈强[1] 陈亮[1] 付云起[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《太赫兹科学与电子信息学报》2015年第4期569-573,共5页Journal of Terahertz Science and Electronic Information Technology

基　　金：中国工程物理研究院太赫兹科学技术基金资助项目(CAEPTHZ201308);教育部新世纪优秀人才资助计划(NCET-10-0894)

摘　　要：基于超材料和压缩感知理论设计了一套简便的快速成像系统,可用于毫米波及太赫兹(THz)成像,具有结构简单,成像速度快,在不同频段移植性强等优点。系统采用超材料结构互补(CELC)单元设计单通道成像口径,实现了对信息的物理层压缩。基于口径在不同频率辐射特性的不相关性,构造测量矩阵,以扫频方式实现对目标场景的稀疏测量,最后采用两步迭代阈值(Tw IST)算法实现对目标场景的重构。已完成K波段、THz波段成像口径设计,以及K波段成像仿真实验,40 cm成像口径理论上具备4.6 cm的距离分辨力和1.3°的角度分辨力。A simple and rapid imaging system based on metamaterials and Compressed Sensing(CS) theory is designed, which can be used in millimeter wave and THz imaging with a simple structure and good portability in different frequency bands. The system has a single-channel imaging aperture composed of metamaterial structure Complementary Electric-LC(CELC) unit, then the information can be compressed on the physical layer. Because of the irrelevance of aperture's radiation characteristics under different frequencies, the frequencies are swept to achieve multiple measurements. By using the Two-step Iterated Soft Thresholding(Tw IST) algorithm, the scenes are reconstructed. The imaging aperture designs of K-band and terahertz band are completed as well as the simulation test of imaging in K band. For a 40 cm imaging aperture, a range resolution of 4.6 cm and an angular resolution of 1.3° can be reached theoretically.

关 键 词：超材料 压缩感知 成像 

分 类 号：TN911.7[电子电信—通信与信息系统]