Abstract
This paper addresses the disturbance rejection problem for networked control systems (NCSs) subject to time-varying delays and measurement noise. Firstly, the uncertainty caused by the delay is modeled to be a delay-induced disturbance (DID) and treated as part of the lumped disturbance. Secondly, an adaptive-filter-based EID (AFEID) estimator is proposed to estimate this lumped disturbance under the effect of measurement noise. A new filter is designed by introducing an adjustable zero. Then, an adaptive characteristic-adjustment mechanism is constructed for the filter to resolve the contradiction between fast disturbance reconstruction and measurement noise attenuation. Finally, experimental results reveal the superiority of the proposed method.
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