Abstract: Based on the background of airplane-satellite free space quantum key distribution (QKD), a large-disturbance suppression tracking control system is designed for the disturbance characteristics of the on-board platform of Yun-12 transport aircraft, and simulation and experimental verification for the system are carried out. An active disturbance rejection control algorithm is added to the control system, and the Coulomb viscous friction model is integrated into the simulation system to simulate the internal friction disturbance. Multiple sets of simulation data show that the active disturbance rejection control algorithm reduces the mean miss distance by more than 18% and the standard deviation of miss distance by more than 19% after closed-loop tracking. On the other hand, the experimental verification results show that the active disturbance rejection control algorithm can reduce the mean tracking deviation and standard tracking deviation by 38.8% and 39.4%, respectively, at a given speed. It is indicated that the tracking accuracy and system stability of the designed disturbance suppression tracking control system are better than those of the existing proportional-integral-derivative (PID) control systems. It imporves the tracking accuracy and system stability to a certain extent, and can effectively suppress the large disturbance of the QKD tracking system on mobile platform.

Key words: quantum optics, quantum key distribution, active disturbance rejection control, mobile platform, tracking accuracy