Flat input based canonical form observers for non‐integrable nonlinear discrete‐time systems

Abstract

We define flat inputs for discrete‐time systems and carry over a flat input based observer design strategy for non‐integrable nonlinear continuous‐time systems to the discrete‐time case. This approach allows to design observers for nonlinear discrete‐time systems that cannot be transformed into observer canonical form, i.e., conventional observer design strategies fail. This approach is illustrated by two examples.