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Robust Stabilization of Non-Minimum Phase Nonlinear Systems Using Extended High-Gain Observers

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2 Author(s)
Nazrulla, S. ; Dept. of Electr. & Comput. Eng., Michigan State Univ., East Lansing, MI, USA ; Khalil, H.K.

A robust, stabilizing output feedback controller for systems in the normal form, which could potentially include unstable zero dynamics, is presented. The control scheme adopted herein incorporates continuously-implemented sliding mode control-chosen for its robustness properties as well as its ability to prescribe or constrain the motion of trajectories in the sliding phase-and an extended high gain observer to estimate the derivatives of the output and one of the unknown functions. Stabilization in the case of an unknown control coefficient and uncertain constant parameters is shown.

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Automatic Control, IEEE Transactions on  (Volume:56 ,  Issue: 4 )