Fig. 1. Schematic diagram of Risley prisms scanning

Fig. 2. Risley prisms scanning trajectory. (a) f₁/f₂= −8/5; (b) f₁/f₂=8/5

Fig. 3. Schematic of distance between scanning trajectories

Fig. 4. Distribution characteristics of scanning points. (a) In the counter-rotation f₁/f₂=-14/13; (b) In the co-rotation f₁/f₂=14/13

Fig. 5. Variation characteristics of η with normalized radius r at different N_s. (a) N_s = 1-4;(b) N_s = 5-8

Fig. 6. Internal void when partial field of view is covered