In this paper, an observer-based adaptive backstepping attitude maneuver controller (briefly, OBABC) for flexible spacecraft is\npresented. First, an observer is constructed to estimate the flexible modal variables. Based on the proposed observer, a\nbackstepping control law is presented for the case where the inertia matrix is known. Further, an adaptive law is developed to\nestimate the unknown parameters of the inertia matrix of the flexible spacecraft. By utilizing Lyapunov theory, the proposed\nOBABC law can guarantee the asymptotical convergence of the closed-loop system in the presence of the external disturbance,\nincorporating with the L2-gain performance criterion constraint. Simulation results show that the attitude maneuver can be\nachieved by the proposed observer-based adaptive backstepping attitude control law.
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