信息物理系统的H_/H_(∞)攻击检测观测器设计

Design of H_/H∞ Attack Detector for Cyber Physical System

研究信息物理系统物理层与网络层通信过程中传感器攻击检测问题,首先对整个信息物理系统建立一个动态模型,在信息物理系统存在随机扰动与攻击信号的情况下,设计一类攻击检测器;通过Lyapunov方程将攻击检测问题转化为线性矩阵不等式的求解问题,使得攻击检测观测器在满足H_(-)/H_(∞)性能条件,以此来加强系统对干扰信号的鲁棒性并提高对攻击信号的敏感性,再通过一类迭代法来解出相关增益矩阵,通过比较系统的残差评价函数与系统不存在攻击时的阈值来判断是否存在攻击,最终给与一个仿真实例验证所提方法的准确性。

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 system.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 equation,so that the attack detection observer can solve the gain matrix through a kind of iterative method under the performance 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.