Adaptive integrated guidance and autopilot for hypersonic glider

Abstract

This paper proposes a novel method for the integrated guidance and control (IGC) of glider in dive and pull-up trajectory. The main objective is robust and adaptive tracking for flight path angle (FPA). Firstly, the integrated guidance and autopilot nonlinear model is built based on the IGC with a second order rudder dynamics. Then the back-stepping Ii adaptive control is implemented to deal with the aerodynamics coefficient uncertainties, control surface uncertainties and unmatched time-varying disturbances in IGC design. For the autopilot, a back-stepping sliding mode control is designed to track the control input of IGC, and a nonlinear differentiator is used to avoid direct differential of the control input. Through a series of 6-DOF numerical simulations, it's shown that the proposed scheme successfully cancels out the uncertainties and disturbances in tracking two kinds of FPA trajectory. The contribution of this paper lies in the application and determination of nonlinear integrated design of guidance and control system for hypersonic glide.