Trajectory tracking control of hypersonic reentry vehicle based on adaptive fuzzy system

Considering inaccurate model and simplified calculation problems of the hypersonic reentry vehicle, this paper presents an adaptive fuzzy control system of the trajectory tracking control method. Firstly we introduced the principle of fuzzy system, then used fuzzy control theory to approximate the second-order drag acceleration model and got drag model by fuzzy identification, finally designed the adaptive controller. The simulation results show that the fuzzy adaptive tracking control method don't depend on the dynamic model, but only rely on drag of the vehicle suffered, it can be measured directly or obtained by the aerodynamic model of the flight, the can generate tracking guidance control law, and the fuzzy adaptive tracking control method enables hypersonic vehicle to track the drag reference trajectory, realizes safe reentry and the terminal states can meet the requirements of the terminal constraints with high precision.