Micro-Doppler effect based vibrating object imaging of coherent detection GISC lidar

Vibration, rotation and movement of the object generally have adverse effects on the detection and imaging for active and passive sensing. However, by combination of coherent detection and ghost imaging (GI), we propose a novel lidar system called coherent detection ghost imaging via sparsity constraints (GISC) lidar. The phase information of the signal light is detected by coherent detection. By analysing the phase change of the signal light, the vibrating information of the object is obtained. Backed up by experiments, coherent detection GISC lidar is demonstrated to image vibrating objects. Based on the short-time Fourier transform, two objects vibrating with different phases and amplitudes are experimentally demonstrated to image independently by coherent detection GISC lidar. Through the vibrating information, the capability of object identification can even be proposed. We strongly believe that coherent detection GISC lidar will pave the way for vibrating objects imaging and identification. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.