Switching time-/event-triggered control of cyber–physical systems under hybrid attacks and finite bit rates

Abstract

This paper focuses on the secure control of quantized cyber–physical systems (CPSs) under hybrid attacks, including denial-of-service (DoS) attacks and deception attacks. The joint effects of hybrid attacks and finite bit rate constraints may induce quantization saturation and sensor–controller information mismatch. To avoid quantization saturation, we propose a dynamic bit rate (DBR) quantization strategy and a switching time-/event-triggering (STET) strategy. Compared to existing methods, our strategies can reduce the required stabilizing bit rate while maintaining system resilience against attacks. Moreover, a novel state estimate compensation strategy is proposed to resolve the sensor–controller information mismatch. Sufficient stabilizing bit rate conditions are derived. An example system is further simulated to verify the effectiveness of the proposed strategies.