Abstract
This paper investigates the problem of an observer-based controller for the flight control of the HL-20 flight vehicle in the low altitude flight stage. The difficulty arises when the coupling of the control channels effects on each other. Moreover, due to limitations of rate gyroscope drift, free gyroscopes with high-precision Euler angles are considered. Consequently, for a control purpose, output feedback is used and by considering the coupling effects as disturbance, an observer is designed using the back-stepping method to estimate angular rates. These estimations are used in the controller design and with the Lyapunov function and trajectory initialization, globally uniformly bounded is achieved for the observer-based controlled system. The validity and effectiveness of the designed controller for the flight controller are shown by simulation results.
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