Design of H_/H∞ Attack Detector for Cyber Physical System
This paper studies the problem of sensors attack detection in the communication between physical layer and network layer of cyber physical system.Firstly,a dynamic model is established for the whole cyber physics sys-tem.When the cyber physical system has random disturbance and attack signal,a kind of attack detector is designed,and the attack detection problem is transformed into the problem of linear matrix inequality through Lyapunov equa-tion,so that the attack detection observer can solve the gain matrix through a kind of iterative method under the per-formance condition,in order to strengthen the robustness of the system to disturbances and improve the sensitivity to attack signals.Then,the residual evaluation function of the system is compared with the threshold while the system does not have any attack to judge whether there exists any attack.Finally,a simulation example is given to verify the accuracy of the proposed method.
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