Output Tracking Problem of Uncertain Nonlinear Systems with High-Order Nonlinearities

This study addresses the problem of global practical output tracking by state feedback for a class of high-order non-linear systems with more general uncertainties, to which the existing control methods are inapplicable. By introducing sign function and necessarily modifying the method of adding a power integrator, a continuous state feedback controller is successfully constructed to guarantee the tracking error achieve arbitrarily small.