关键词: 信息物理系统, 卡尔曼滤波, 远程状态估计, 攻击与检测, 安全性

Abstract: In the process of transmitting data in wireless networks, once cyberphysical systems are attacked by linear deception attacks, which will bring huge losses to the society. This paper considers the security detection problem of multisensor systems. It first discusses the limitation of the traditional Chisquare detector. And then, a detection scheme based on similarity measure is proposed to detect whether the system is subject to attacks by comparing the similarities between the estimated values of each pair of sensors and the similarities between each sensor and the estimated value of the whole system. The experiment uses the Chebyshev distance detection method to carry out MATLAB simulation. The results show that based on this detection scheme, the detection value of the system will change before and after being attacked, which verifies the effectiveness of the detection scheme.

Key words: cyber physical systems;Kalman filter, remote state estimation, attack and detection;safety