In recent years, digital coding and programmable metamaterials have brought new ideas to the fields of communication, detection, and imaging. Optimizing the reference signal matrix to achieve fast, accurate radar imaging has great practical significance for environment detecting. We selected the reference matrix based on the correlation of the matrix, and simulated the impact on the imaging results. The results of the experiment will inspire us to achieve accurate target imaging with less measurements and promote the development of fast and real-time imaging.

metamaterials; radar imaging; reference signal matrix; correlation