Event-triggered high-gain observer design for nonlinear systems

In this work, an event-triggered high gain observer (ET-HGO) design is considered for a continuous-time nonlinear system combined with disturbance and uncertainty. In the event-trigger scheme, the performance of the ET-HGO depends on the triggering condition directly. Hence, in this work, for the high-gain observer considered, an event-triggered transmission strategy, which does not relies on the other system state but the output of the control system, is proposed such that the observation error is asymptotically bounded. Further, with mild restriction, the observation error is guaranteed to be bounded all the time. The obtained theoretical results are evaluated through the numerical simulations.