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Adaptive nonlinear output feedback tracking with a partial high-gain observer and backstepping

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1 Author(s)
M. Jankovic ; Sci. Res. Lab., Ford Motor Co., Dearborn, MI, USA

An adaptive output feedback controller for nonlinear systems with nonlinearities depending on the first r (1⩽r⩽n) derivatives of the output is proposed. The derivatives are estimated with a partial state high-gain observer, and the remaining states are handled using a backstepping method. Compared with methods based on full state high-gain observer, this approach improves robustness with respect to measurement noise and avoids overparametrization. Semiglobal tracking is proven under the assumption that the regressor is persistently exciting

Published in:

IEEE Transactions on Automatic Control  (Volume:42 ,  Issue: 1 )