Fig. 1. Mode of circular cylinder scanning

Fig. 2. Signal of stepped frequency modulation continuous wave

Fig. 3. Movement trajectory analysis diagram of range-angle dimensional section (a) geometry of rotary table, (b) range history of scattered points at different rotation angles

Fig. 4. Flow chart of time-frequency coordination 3D reconstruction algorithm

Fig. 5. Simulation experiment of space cube model (a) scatters of cube model, (b) imaging cube with height-angle dimension under time-frequency coordination 3D reconstruction algorithm

Fig. 6. Simulation results of scattering A1 with cube under time-frequency coordination 3D reconstruction algorithm （a）section of height dimension，（b）section of angle dimension，（c）contour map of A1，（d）three-dimensional impulse response diagram of scattering A1

Fig. 7. Three-dimensional reconstruction of cube mode under time-frequency coordination 3D reconstruction algorithm

Fig. 8. Simulation experiment of human body model under time-frequency coordination 3D reconstruction algorithm （a）three-dimensional point cloud model of human body，（b）projection imaging of human body in height-angle dimension with time-frequency coordination 3D reconstruction algorithm，（c）three-dimensional reconstruction of human body under time-frequency coordination 3D reconstruction algorithm

Fig. 9. Experimental figures of human raw echo data processing under back projection 3D reconstruction algorithm （a）imaging result of front of human body by time-frequency coordination 3D reconstruction algorithm，（b）imaging result of back of human body by time-frequency coordination 3D reconstruction algorithm

Fig. 10. Experimental figures of human raw echo data processing under time domain back projection 3D reconstruction algorithm （a）imaging result of front of human body by time domain back projection 3D reconstruction algorithm，（b）imaging result of back of human body by time domain back projection 3D reconstruction algorithm

Fig. 11. 3D Reconstruction of raw data with human body under back projection 3D reconstruction algorithm：（a）reconstruction result of front of human body by back projection 3D reconstruction algorithm，（b）reconstruction result of back of human body by back projection 3D reconstruction algorithm

Fig. 12. 3D Reconstruction of raw data with human body under back projection 3D reconstruction algorithm （a）reconstruction result of front of human body by back projection 3D reconstruction algorithm，（b）reconstruction result of back of human body by back projection 3D reconstruction algorithm