Hypersonic flight vehicle's flight path angle tracking control with attack angle constraints

To overcome the attack angle constraints, this paper uses the barrier Lyapunov function (BLF)to study an flight path tracking control method under attack angle constraints. The hypersonic flight vehicle model was partially linearized to obtained the parameterized control model that agrees with the strict feedback form. BLF backstepping method is used to design the flight path angle tracking controller that has attack angle constraints. Stability of closed loop system was proved and the relationship between scope of attack response and controller's parameters was established. The flight path angle tracking simulation uses the backstepping method so as to compare it with the BLF. The simulation results show that the BLF similar performances in term of steady-state error, but the BLF can restrict the attack angle within the required condition.