Comment on 'Robust Saturated Finite Time Output Feedback Attitude Stabilization for Rigid Spacecraft'

摘要

This comment points out that the main result presented in Theorem 4 in [1] is erroneous. Theorem 4 of [1] presents a solution to the problem of robust finite time output feedback stabilization of rigid spacecraft subject to external disturbance and input saturation. The saturation function sat(τ) is rewritten as [Eq. (69)] [1] sat(τ) = Θ(τ)τ (1) with Θ(τ) = diag(Θ_1, (τ_1), Θ_2(τ_2), Θ_3(τ_3)), and Θ_i(τ_i) is defined as [Eq. (70)] [1] Note that there is a typographical error in [1]; τ_max,i> 0 should be τ_mi > 0.