Fig. 1. Architecture of 340 GHz imaging system

Fig. 2. Definition of the radar coordinate

Fig. 3. Sparse array schematic diagram

Fig. 4. PSF simulation results of range and azimuth

Fig. 5. Schematic diagram of multi-channel echo coherence at the main lobe

Fig. 6. Schematic diagram of multi-channel echo coherence at the grating lobe

Fig. 7. (a)The simulation imaging results of range dimension; (b) The simulation imaging results of azimuth dimension

Fig. 8. The simulation imaging results of point target (a) the imaging result of BP algorithm, (b) the image weighted by CF, (c) the image weighted by PCF, (d) the image weighted by SCF

Fig. 9. The imaging results of metal ball (a) the imaging result of BP algorithm, (b) the image weighted by CF, (c) the image weighted by PCF, (d) the image weighted by SCF

Fig. 10. The imaging results of fake gun (a) optical picture of the imaging target, (b) the imaging result of BP algorithm, (c) the image weighted by CF, (d) the image weighted by PCF, (e) the image weighted by SCF