Fig. 1. Schematic of precision tracking system

Fig. 2. NSGA-II algorithm flow

Fig. 3. Open loop bode plot of fine tracking system

Fig. 4. Result of parameter optimization by NSGA-Ⅱ algorithm

Fig. 5. Comparison of error suppression ability of improved control system，traditional and second-order PI systems

Fig. 6. Comparison of error power spectral density between the improved system and the traditional system

Fig. 7. Improved simulation model of precision tracking system

Fig. 8. Schematic of the fine tracking system experiment

Fig. 9. Experiment of an improved precision tracking system

Fig. 10. The measured interference suppression curve of the improved precision tracking system