Shi Tianbiao, Zhu Fanglai
The College of Electronics and Information Engineering, Tongji University, Shanghai, 201804, China.
The College of Electronics and Information Engineering, Tongji University, Shanghai, 201804, China.
ISA Trans. 2023 Oct;141:143-156. doi: 10.1016/j.isatra.2023.06.040. Epub 2023 Jul 5.
The paper investigates the secure control problems for cyber-physical systems (CPSs) when the transmission channels suffer from Denial-of-Service (DoS) attacks based on switching observer and unknown input reconstruction (UIR). Firstly, an augmented system whose system state consists of the original system state and the measurement noises is set up, and the preconditions for the original system and augmented system are discussed in detail. Secondly, a full-order observer is constructed to generate the estimations of the augmented system state. Besides, based on the state estimation, an algebraic UIR method is developed and the UIR decouples the control input signal successfully. Thirdly, under the situation that some transmission channels suffer from DoS attacks, an observer-based secure controller is designed based on state estimation feedback and UIR feedback in view of a switching system. The stability of the switching system is analyzed as well. Finally, to verify the effectiveness of the proposed protocols, two simulation examples and the comparison with existing methods are given.
本文基于切换观测器和未知输入重构（UIR）研究了传输通道遭受拒绝服务（DoS）攻击时的网络物理系统（CPS）安全控制问题。首先，建立了一个系统状态由原始系统状态和测量噪声组成的增广系统，并详细讨论了原始系统和增广系统的前提条件。其次，构造了一个全阶观测器来生成增广系统状态的估计值。此外，基于状态估计，开发了一种代数UIR方法，该方法成功地解耦了控制输入信号。第三，在一些传输通道遭受DoS攻击的情况下，针对切换系统，基于状态估计反馈和UIR反馈设计了一种基于观测器的安全控制器。同时分析了切换系统的稳定性。最后，为验证所提协议的有效性，给出了两个仿真例子并与现有方法进行了比较。
