基于编码超表面的三维孔径编码成像研究

Research on 3D Coded Aperture Imaging Based on Coding Metasurface

针对雷达系统在微波频段对静止目标成像分辨率低的问题,基于超材料和孔径编码成像体制设计了一套三维成像系统,同时提出了一种三维成像的优化算法.系统将立体目标所在场景划分为4个成像平面上的成像网格,利用编码超表面在不同编码时辐射特性的不相关性构造测量矩阵,实现了在Ka波段对静止目标的高分辨成像.仿真结果表明,此成像系统能够对2 m距离内的静止目标实现准确重构,方位向分辨率为20 cm,距离向分辨率为10 cm.

To solve the problem of low resolution of the radar system for imaging stationary targets in the microwave frequency band, a three-dimentional(3D) imaging system was designed based on metamaterial and coded aperture imaging system, and an optimization algorithm for 3D imaging was proposed. The system divided the space where the 3D target was located into grids on four imaging planes, and constructed the measurement matrix using the irrelevance of the radiation characteristics of the coding metasurface at different encodings, and finally achieved high-resolution imaging of stationary targets in the Ka band. The simulation results show that this imaging system can accurately reconstruct a stationary target within a distance of 2 m;the azimuth resolution is 20 cm, and the distance resolution is 10 cm.