Observer-Based Switching-Like Event-Triggered Control of Nonlinear Networked Systems Against DoS Attacks

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Abstract
This article investigates the problem of observer-based switching-like event-triggered control (ETC) for non- linear networked systems subject to aperiodic denial-of-service (DoS) attacks. First, a full-order state observer is developed to estimate the unavailable system states and used to establish the switching-like event-triggered condition, which includes two different threshold para- meters. Second, in order to improve the bandwidth re- source utilization and compensate for the influence of DoS attacks, a switching-like event-triggered mechanism (SETM) is designed, which can adaptively switch two different threshold parameters based on the presence or absence of DoS attacks. By combining the proposed SETM, an output feedback controller is constructed and a new observer-based switching-like ETC strategy is presented for nonlinear networked systems. Meanwhile, the relationship between the inactive/active period of the DoS attacks, the parameters of the SETM, the unmeasurable states, and the sampling period in the model are quanti- tatively discussed on the basis of the new strategy. Then, in terms of the proposed control strategy, the global asymptotical stability of the nonlinear networked systems can be obtained. Finally, two examples are used to verify the feasibility and effectiveness of the designed strategy.
Funding Information
  • National Natural Science Foundation of China (61873061)
  • Natural Science Foundation of Jiangsu Province (BK20211162)

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