Global Output Feedback Control of Strict-Feedback Nonlinear Systems with Prescribed Performance and Applications

In this brief, a global output feedback control is represented for nonlinear strict-feedback systems with unknown dynamics. A modified prescribed performance function (PPF) that does not need the accurately initial error is designed, and incorporated into control design. The unmeasured system states are estimated via using high-order sliding mode observer. Then, the global output feedback controller is proposed for nonlinear strict-feedback systems without using function approximators to reject the unknown system dynamics. Finally, the experiments show effectiveness of the suggested approach.