Quantized-Observer-Based Event-Triggered Secure Consensus for NMASs Under DoS Attacks

In order to study the safety control of linear cyber-physical systems, under constrained network communication burden, this article conducts research on the event-triggered cooperative stabilization problem of networked multiagent systems (NMASs) with unavailable states and denial-of-service (DoS) attacks. First, we construct a state observer to estimate unavailable internal system state. Second, a quantization control policy is proposed between the encoder and the decoder for reducing the data transmission. Third, we develop an event-triggered mechanism (ETM) with quantized state estimation to cut down the occupation of network communication bandwidth. To make up for the influence of DoS attacks launched between the observer and the controller channel, we establish an event-triggered hybrid controller based on quantized state observer to carry out secure consensus of NMASs, and deduce the secure consensus conditions via multiple Lyapunov functions. Moreover, the Zeno behavior is effectually eliminated due to the fact that each network node has a lower positive bound. In the end, the effectiveness of the developed safety control strategy via quantized observer is revealed through an example.