IEEE Trans Cybern. 2018 Dec;48(12):3432-3439. doi: 10.1109/TCYB.2018.2815758. Epub 2018 Mar 27.
This paper is concerned with reliable control problems of cyber-physical systems against a class of frequency-constrained sensor and actuator attacks. We consider a continuous-time linear physical system equipped with an observer-based abnormal detector, and it is assumed that control signals and partial sensor outputs transmitted via network layers are vulnerable to cyber attacks. With the use of detection mechanisms of the abnormal monitor, an upper bound of the worst stealthy attacks is obtained, which is composed of the information of the detector's threshold, the attack's structure, and frequency characteristic. By exploiting the bound information, a novel attack compensator, which can stabilize the system with a nearly desired system performance, is proposed for a situation where an attack may occur without triggering an alarm. Finally, the effectiveness of the proposed control policy is verified by a numerical example.
本文研究了一类频域受限传感器和执行器攻击下的网络物理系统可靠控制问题。考虑了一类带有基于观测器的异常检测机制的连续时间线性物理系统，假设通过网络层传输的控制信号和部分传感器输出易受到网络攻击。利用异常监测器的检测机制，得到了最坏隐蔽攻击的一个上界，它由检测器的阈值、攻击的结构和频率特性的信息组成。利用该界信息，提出了一种新的攻击补偿器，当攻击可能发生而不会触发报警时，该补偿器可以使系统具有几乎期望的系统性能。最后，通过数值例子验证了所提出的控制策略的有效性。
