Fig. 1. Multi-rotor UAV and fixed-wing UAV

Fig. 2. Schematic diagram of signals or images of typical UAV detection methods. (a) Sound wave signal; (b) radar signal; (c) radio signal; (d) visible light image; (e) infrared image; (f) lidar image

Fig. 3. Block diagram of remote UAV surveillance video detection algorithm^[34]

Fig. 4. A drone detection system incorporating an infrared camera^[40]. (a) Hardware system; (b) software block diagram; (c) detection effect (with visible light detection effect on the top and infrared detection effect on the bottom)

Fig. 5. 3D laser radar detection UAV system^[44]. (a) UAV detection environment (distance is about 50 m); (b) LiDAR scanning map and detection results; (c) enlarged view for UAV

Fig. 6. Schematic of the basic principle of single-photon lidar

Fig. 7. Representative achievements in the development process of single-photon lidar

Fig. 8. 201.5 km imaging lidar system structure diagram and renderings^[60]. (a) Visible light schematic diagram of the detection mountain; (b) schematic diagram of the experimental device; (c) equipment hardware photo; (d) view of the temporary laboratory at an altitude of 1770 m; (e) satellite map showing the starting and detection positions; (f) enlarged view of the snow mountain; (g) three-dimensional reconstruction outline map; (h) three-dimensional reconstruction profile map

Fig. 9. Three-dimensional imaging image of wind turbine under 10.5 km thick fog state. (a) Experimental detection satellite image; (b) three-dimensional reconstruction image of wind turbine; (c) three-dimensional reconstruction profile image; (d) experimental setup image; (e) visible light target real shot image