Adaptive output regulation for general output feedback nonlinear systems with integral ISS inverse dynamics

The output regulation problem for output feedback nonlinear systems with integral input-to-state (iISS) inverse dynamics was studied recently for the unity relative degree case. In this paper, we further study the same problem for the case where the relative degree is greater than one. For this purpose, we need to develop a recursive procedure to design an output feedback controller. An example will also be given to illustrate the design method.