Observer design for nonlinear triangular systems with unobservable linearization
Provides theoretical observer design conditions for a class of nonlinear systems, but the results are incremental and limited to specific triangular structures.
The paper addresses observer design for triangular nonlinear systems with unobservable linearization, deriving sufficient conditions for a Luenberger-type observer when initial states are bounded, and proposing a switching sequence of time-varying dynamics for the general case.
The paper deals with the observer design problem for a wide class of triangular time-varying nonlinear systems, with unobservable linearization. Sufficient conditions are derived for the existence of a Luenberger-type observer, when it is a priori known that the initial state of the system belongs to a given nonempty bounded subset of the state space. For the general case, the state estimation is exhibited by means of a switching sequence of time-varying dynamics