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• W3036354427 startingPage "1659" @default.
• W3036354427 abstract "This paper investigates the composite control scheme of robust nonlinear disturbance observer (RNDO) with adaptive non-singular fast terminal sliding mode control (NSFTSMC) technique for the attitude tracking of rigid spacecraft. The spacecraft is subjected to the parametric uncertainties, external disturbances, and actuator faults. The proposed RNDO estimates the overall lumped disturbance (combination of faults and disturbances) in finite-time. Moreover, it improves the disturbance rejection property of the composite control by feedforward compensation. An adaptive law is also employed in the composite control to enhance the robustness against the cases where RNDO takes some time for estimation, e.g., when there is a sudden change in the lumped disturbance. Further, the proposed controller is also enriched with anti-unwinding property to tackle the problem of unwinding in the quaternion based attitude representation. The stability analysis of the closed-loop system under the composite control scheme guarantees the finite-time convergence of relative state variables using the Lyapunov stability theory. The simulation analysis with the comparative study illustrates the effectiveness of the proposed strategy in terms of better disturbance rejection ability, higher accuracy, faster convergence, and better steady-state performance." @default.
• W3036354427 created "2020-06-25" @default.
• W3036354427 creator A5034681226 @default.
• W3036354427 creator A5059041371 @default.
• W3036354427 date "2020-10-01" @default.
• W3036354427 modified "2023-10-16" @default.
• W3036354427 title "Finite-time fault tolerant attitude tracking control of spacecraft using robust nonlinear disturbance observer with anti-unwinding approach" @default.
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• W3036354427 doi "https://doi.org/10.1016/j.asr.2020.06.019" @default.
• W3036354427 hasPublicationYear "2020" @default.
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