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The flight dynamics of air-breathing hypersonic vehicles (AHVs) is highly nonlinear, multivariable coupling, and includes inertial uncertainties and external disturbances, which require strong robust and high accuracy controllers. Considering the inertial uncertainties and external disturbances, the flight control system of AHVs can be designed as the general control issue for an uncertain nonlinear system with mismatched disturbances. To achieve the target of disturbance rejection, this paper proposes direct and indirect disturbance rejection control approaches to investigate the flight control of AHVs. For different levels of system disturbance, the typical direct and indirect disturbance rejection control schemes are presented and compared with each other. Finally, simulation results illustrate the advantages and application limits of the direct and indirect disturbance rejection control approaches.

Flight Control of Air-Breathing Hypersonic Vehicles Based on Disturbance Rejection Scheme