Active Disturbance Rejection Attitude Control of Underactuated Hypersonic Vehicle

Abstract

AbstractThe hypersonic vehicle has strong coupling characteristics and uncertainty during flight. This paper deals with the problem of strong nonlinearity and lateral underactuated control of the hypersonic vehicle. An adaptive attitude controller is designed based on the iterative learning active disturbance rejection method (ILC-ADRC). To begin, the attitude model divides the outer attitude-loop from the inner underactuated angular-rate-loop. Then, a lateral controller is designed by single-input-multi-outputs nonlinear error feedback law, which needs the compensation of the interference totally in the lateral channel in real-time. Meanwhile, the total interference of the lateral channel can be estimated by the extended state observers, so as to estimate and compensate for the real-time disturbance of the underactuated control model. Iterative learning is used to adaptively control the bandwidth of the extended state observer to adjust output chattering. Appropriative bandwidth can achieve quick and accurate tracking control of the desired flight attitude. The numerical simulation demonstrate that the project of the underactuated ILC-ADRC controller tracking the expected attitude angle command quickly and accurately under disturbance.KeywordsHypersonic vehicleUnderactuatedADRCIterative learning