Integrated guidance and control with L2 disturbance attenuation for hypersonic vehicles

A robust integrated guidance and control (IGC) approach with L2 gain performance is addressed for a hypersonic vehicle that operates in the dive phase and attacks a fixed target with a terminal angular constraint. A full-state hypersonic vehicle model that adopts the bank-to-turn technique is developed by combining relative motion equations, expressed in the line-of-sight coordinate system, between the vehicle and the target with rotational motion equations. For the proposed model in a strict feedback system, a novel IGC law with L2 gain performance is developed based on the backstepping design procedure by recursively constructing Lyapunov functions of the model subsystems. Numerical simulations conducted for a six degrees of freedom model of the general hypersonic vehicle show that the proposed IGC law is robust against existing uncertainties and satisfies performance requirements.