Observer-Based Secure Consensus Control for Multi-Agent Systems Under DoS Attacks: A Hybrid Event-Triggered Approach

This paper investigates the secure consensus control problem for linear multi-agent systems (MASs) with unmeasurable system states and directed topologies under Denial-of-Service (DoS) attacks. DoS attacks will be conducted aperiodically by malicious attackers and interrupt communication channel. First, an observer is introduced to estimate the unknown system states. Then, a hybrid event-triggered approach based on the system output, observer output, and estimator output is designed to schedule controller updating, and the designed event-triggered approach can eliminate Zeno behavior. Under the premise of achieving consensus, the range of attack duration is provided. Furthermore, an improved separation method is utilized to design and obtain the controller and observer gains. Finally, the effectiveness of the main results is validated through a numerical simulation.