Fig. 1. Schematic for rotational-double-prism-based beam steering system. (a) Description of the system parameters; (b) system arrangement

Fig. 2. Slewing angle ΔΨ of outgoing beam. (a) Schematic for beam steering in three-dimensional space; (b) schematic for beam steering in polar coordinate

Fig. 3. Slewing angle ΔΨ of direction for target with radial movement. (a) Schematic for beam steering in three-dimensional space; (b) schematic for beam steering in polar coordinate

Fig. 4. Ratio of prisms’ rotational speed to beam slewing rate for tracking target with radial movement. (a) Glass prism system; (b) germanium prism system

Fig. 5. Slewing angle ΔΨ of direction for target with tangential movement. (a) Schematic for beam steering in three-dimensional space; (b) schematic for beam steering in polar coordinate

Fig. 6. Change of ratio of prisms’ rotational speed to beam slewing rate for tracking target with tangential movement

Fig. 7. Decomposition of instantaneous slewing rate of outgoing beam. (a) Schematic for beam steering in three-dimensional space; (b) schematic for beam steering in polar coordinate

Fig. 8. Ratio of prisms’ rotational speed to beam slewing rate for tracking target with the glass prism system (based on the first group of inverse solutions). (a) θ=0°; (b) θ=180°; (c) θ=30°; (d) θ=210°; (e) θ=60°; (f) θ=240°; (g) θ=90°; (h) θ=270°; (i) θ=120°; (j) θ=300°; (k) θ=150°; (l) θ=330°

Fig. 9. Ratio of prisms’ rotational speed to beam slewing rate for tracking target with the glass prism system (based on the second group of inverse solutions). (a) θ=0°; (b) θ=180°; (c) θ=30°; (d) θ=210°; (e) θ=60°; (f) θ=240°; (g) θ=90°; (h) θ=270°; (i) θ=120°; (j) θ=300°; (k) θ=150°; (l) θ=330°

Fig. 10. Moving direction of target with the same angle θ to radial direction

Fig. 11. Variations of ratio of prisms’ rotational speed to beam slewing rate as a function of Φ and θ for the glass prism system. (a) (M1)C1; (b) (M2)C1; (c)(M1)C2; (d)(M2)C2

Fig. 12. Maximum ratio Mmof prisms’ rotational speed to beam slewing rate and the corresponding values θ for target tracking with the glass prism system. (a) The maximum ratios; (b) the difference between the maximum ratios; (c) the corresponding values θ