Fig. 1. Satellite ground quantum communication link diagram

Fig. 2. Overall block diagram of quantum tracker control system

Fig. 3. Comparison of step response of four differentiators

Fig. 4. Curve fitting effect of four differentiators

Fig. 5. Quantum communication experiment site

Fig. 6. Mode switching process based on fractional order tracking differentiator

Fig. 7. Mode switching process based on first order linear tracking differentiator

Fig. 8. Orbital elevation reference position curve and actual position tracking curve

Fig. 9. Track position data tracking error

Fig. 10. Reference speed curve of orbit elevation and actual output speed curve

Fig. 11. Tracking speed error

Fig. 12. Miss distance tracking error based on traditional control algorithm tracking differentiator

Fig. 13. Sum of quantum received data

Fig. 14. Miss distance error based on auto disturbance rejection model predictive control

Fig. 15. Sum of quantum received data