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The strategy utilizes a novel fixed-time observer to estimate unmeasurable states and compensate for uncertainties and external disturbances. An adaptive mechanism is introduced, eliminating the need for prior knowledge of the lumped disturbances. To ensure rapid convergence of the sliding mode surface, a fixed-time variable exponent reaching law based on the arctan function is proposed. Building on the observer and reaching law, a fixed-time sliding mode controller is designed to guarantee fast convergence and avoid singularity issues. Lyapunov theory is used to rigorously prove the stability of the closed-loop system. 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