The existence of Unknown Input Observers (UIO) for nonlinear systems has been characterized recently by the first authors of this note as an abstract incremental dissipativity property of the system. In this paper, it is shown that for a large class of systems this condition can be made computable by the use of LMI techniques, leading to a constructive design method of nonlinear UIOs. Copyright...

This article presents a new observer design approach for linear time invariant multivariable systems subject to unknown inputs. The is based on transformation the so-called special coordinate basis (SCB). form reveals important system properties like invertability or finite and infinite zero structure. Depending system's strong observability properties, SCB allows straightforward input utilizin...

This paper focuses on the use of unknown input observers for detection and isolation of actuator and effector faults with control reconfiguration in overactuated systems. The control allocation actively uses input redundancy in order to make relevant faults observable. The case study of an overactuated marine vessel supports theoretical developments.