Research on 3D Coded Aperture Imaging Based on Coding Metasurface

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.