Fig. 1. Primordial gravitational wave telescope operation mode

Fig. 2. Environmental protection cover structure diagram

Fig. 3. The relationship between the telescope observation angle and the observation window angle

Fig. 4. Relation between friction force and velocity of motion

Fig. 5. Kinematics model of altitude axis of environmental protection cover

Fig. 6. Angular velocity timing diagram of the altitude axis for the environmental protection cover

Fig. 7. Dual-motor servo system structure

Fig. 8. Type 4-5-3 BP neural network structure

Fig. 9. PID control flow diagram based on SAPSO-BP

Fig. 10. Fitness curves for SAPSO and PSO

Fig. 11. SAPSO-BP and PSO-BP control system response

Fig. 12. System step response curve (1 (°)/s)

Fig. 13. System step response curve (2 (°)/s)

Fig. 14. Integral of the step response error curve

Fig. 15. System trapezoidal tracking curve

Fig. 16. Integral of the trapezoidal tracking error curve

Fig. 17. System sine tracking curve

Fig. 18. Integral of the sine tracking error curve

Fig. 19. Dual-motor torque during system sine tracking