Reduced-order observers for multivariable systems with inaccessible disturbance inputs

Abstract

The problem of observing the state vector of a multivariable system subjected to inaccessible inputs is considered. Using a polynomial-type approximation for these inputs, a set of necessary and sufficient conditions that can be readily applied to determine the existence of an observer is obtained. Computer simulation results for a third-order two-input, two-output system are included.