Finite-Time Sliding Mode Fault-Tolerant Secure Control for Cyber-Physical Systems Under Periodic DoS Jamming Attacks and Packet Dropouts

This paper investigates the finite-time sliding mode fault-tolerant secure control issue for cyber-physical systems under period denial-of-service (DoS) jamming attacks and packet dropouts. The considered cyber attacks are periodic DoS attacks which are modeled by a kind of periodic jamming signals that cause data dropouts on the sensor-to-observer channel. Additionally, an update rule is proposed to characterize packet dropouts caused by intrinsic factors and periodic DoS jamming attacks of wireless channels. Based on the update rule, an observer is presented to obtain the unknown state and fault information. Then, a sliding mode fault-tolerant secure controller is designed using estimated information to ensure the estimated state reaches the sliding surface within a finite time, entering the quasi-sliding mode domain. Moreover, sufficient conditions are provided to guarantee the stochastic finite-time boundedness of the closed-loop system during the whole phase, even in the presence of packet dropouts and DoS jamming attacks. Finally, a simulation result validates the effectiveness and superiority of the proposed method.