Experimental Research on Imaging of Non-rigid Targets with Micro-motion Parts in the THz Region

Imaging of non-rigid targets with micro-motion parts has always been a difficulty in the radar imaging field because of the complex movement, which will lead to defocusing in azimuth direction of the radar image. Compared with the traditional microwave band, the difficulty is especially serious in the terahertz region due to the Doppler sensitivity of the terahertz radar system. In this paper, experiments on imaging of a helicopter model with a 440 GHz radar system were carried out and an echo signal separation method based on the improved singular spectrum analysis was adopted The echo signals of the micro-motion parts and the translational parts on the targets were separated excellently, thus laying a good foundation for further processing. The good focusing performance of the imaging result corresponding to the translation part verifies the effectiveness of the echo signal separation method adopted in this paper.