The Design of Nonlinear Flight Control System of Hypersonic Cruise Vehicle Based on Nonlinear Disturbance Observer

Hypersonic vehicle´s nonlinear dynamics system is highly nonlinear, multivariable coupled and includes uncertain parameters. To solve this problem, a new back stepping controller is designed based on nonlinear disturbance observer (NDO). The NDO is used to observe the disturbance of the system and the limitation of the disturbance can be unknown. Theoretical analysis is done to validate that the system satisfy control requirements and is uniformly ultimately bounded. The simulation results also show that the developed method is effective and deals with the problem of uncertain factors preferably.