Fig. 1. Basic structure of linear active disturbance rejection control (ADRC)

Fig. 2. Basic structure of improved linear ADRC

Fig. 3. Sweep Bode plot of fast steering mirror azimuth axis

Fig. 4. Block diagram of fast steering mirror simulation experiment

Fig. 5. Block diagram of traditional ADRC fast steering mirror simulation experiment

Fig. 6. Tracking stagger comparison between traditional ADRC and improved ADRC tracking

Fig. 7. Tracking stagger comparison of improved ADRC with and without disturbance

Fig. 8. Tracking stagger comparison of improved ADRC with and without changing controlled object

Fig. 9. Two-axis two-frame photoelectric stabilization experimental platform

Fig. 10. Fast steering mirror test platform

Fig. 11. Tracking stagger comparison between traditional ADRC and improved ADRC in fast steering mirror at 5° and 0.2 Hz

Fig. 12. Tracking stagger comparison between traditional ADRC and improved ADRC in fast steering mirror at 6.27° and 0.2 Hz