Global Stabilization of A Class of Uncertain Nonlinear Systems

Global output feedback stabilization is investigated for the uncertain nonlinear system whose output function is not known. In order to solve this problem, a smooth state feedback is constructed by adding a power integrator technique, then design a high-order observer to estimate the unmeasurable states. Further, a global output feedback is designed such that the closed-loop system is globally asymptotically stable. An example is provided to illustrate the validity of the proposed method.