Fault and Attack Collaborative Detection for Cyber-Physical System in Complex Network Environment using Delta Operator

In this paper, the H
−
/H
∞
detection for faults and attacks in a Cyber-physical system (CPS) is studied. The complex network environment with random delay, limited communication, actuator cyber attack and sensor cyber attack is considered. And the above system with fault and attack coexisting is discretized by delta operator in high-speed sampling. A set of H
−
/H
∞
observers is constructed, which enables the system to detect the possible fault signal and attack signal respectively and quickly. By using Lyapunov-Krasovskii functional and linear matrix inequalities approach, the sufficient conditions for the system to have asymptotic stability and H
−
/H
∞
performance are given. The feasibility and effectiveness of the proposed method are analyzed through several simulation examples.