In this paper, a higher-order sliding-mode observer is proposed to estimate exactly the observable states and asymptotically the unobservable ones in multi-input–multi-output nonlinear systems with unknown inputs and stable internal dynamics. In addition the unknown inputs can be identified asymptotically. Numerical examples illustrate the efficacy of the proposed observer. Copyright# 2007 John...

The linear switched system is a kind of hybrid system that simultaneously possesses characteristics of both continuous event systems and discrete event systems. In this paper the issue of fault detection of switched systems is investigated using unknown input observers (UIO) and an average dwell time approach. The key parameter of UIOs is designed by solving linear matrix inequalities, which di...

The paper by Edwards and Tan compares sliding mode observers (SMOs) to unknown input observers (UIOs) for the purpose of reconstructing faults that affect linear dynamical systems in the presence of disturbances. This comparison reveals some interesting parallels between the two types of observers. In this discussion, we provide an interpretation of UIOs from the point of view of system inversi...

In this paper, an adaptive sliding mode disturbance observer is designed to counteract the actively. By designing laws, assumptions on are relaxed in proposed observer, its first derivative upper bound considered be unknown. Based output feedback controller constructed for continuous-time linear systems with unknown external disturbance. The incorporates only system information and has less cha...

Unique input output (UIO) sequences have important applications in conformance testing of finite state machines (FSMs). Previous experimental and theoretical research has shown that evolutionary algorithms (EAs) can compute UIOs efficiently on many FSM instance classes, but fail on others. However, it has been unclear how and to what degree EA parameter settings influence the runtime on the UIO...

Wepropose a robust adaptive chaotic synchronization method based on unknown-input observers for master-slave synchronization of chaotic systems, with application to secured communication. The slave system is modelled by an unknown input observer in which, the unknown input is the transmitted information. As in the general observer-based synchronization paradigm, the information is recovered if ...