Robust Gain Scheduling Control of Air-breathing Hypersonic Vehicle via Linear Parameter Varying Technique

The design of a robust gain scheduling controller which is scheduled on Mach number and altitude for the air-breathing hypersonic vehicle (AHV) is presented. In order to capture the nonlinear airspeed and altitude dependence of AHV, a linear parameter varying (LPV) model is constructed from a set of linearization of the AHV longitudinal dynamics. The linear fractional transformation (LFT) representation of the LPV model is obtained using the graph approach so that it can be used for robust control design technique. The control synthesis structure including this LFT representation and the uncertainty model of AHV is successfully used for controller design based on D-K iteration. Simulation result of the designed controller presents excellent tracking performance independent of the fight conditions of AHV.