A fast robust guidance scheme for a hypersonic vehicle in the diving phase.

A fast robust dive guidance scheme for a hypersonic vehicle is proposed based on the extended state observer and sliding mode observer. The three-degree-of-freedom centroid dynamical and kinematical equations containing model and aerodynamic uncertainties are established. A novel three-dimensional coupling relative dynamical model is described based on exact coordinate transformations. The fast robust dive guidance scheme considering navigation errors and uncertainties is derived with the help of extended state observer and sliding mode observer. An optimal control allocation is adopted and the actual commands of the angle of attack and bank angle are obtained via the second order actuator model. Finally, the performance and robustness of the novel dive guidance scheme is verified and validated via an air-breathing generic hypersonic vehicle. [ABSTRACT FROM AUTHOR]