A novel event-triggered extended state observer for networked control systems subjected to external disturbances

In this paper, the event-triggered-based state estimation problem is investigated for a class of nonlinear networked control systems subjected to external disturbances. A novel event-triggered extended state observer (ESO) is utilized to estimate the so-called total disturbance, and an output predictor is adopted for the proposed ESO between two consecutive transmission instants. It is also worth pointing out that, in the newly proposed ESO, an event-triggered mechanism is adopted to update the measurement signal so as to save the communication resource. The sufficient conditions are provided such that the estimation error dynamics is exponentially ultimately bounded. Furthermore, it is proven that the Zeno behavior does not exist for the event-triggering rules. A number of numerical simulations are conducted to verify the validity of the theoretical results.