IEEE Trans Cybern. 2019 Mar;49(3):827-838. doi: 10.1109/TCYB.2017.2787740. Epub 2018 Jan 12.
Cyber-physical systems (CPSs) are naturally highly interconnected and complexly nonlinear. This paper investigates the problem of decentralized adaptive output feedback control for CPSs subject to intermittent denial-of-service (DoS) attacks. The considered CPSs are modeled as a class of nonlinear uncertain strict-feedback interconnected systems. When a DoS attack is active, all the state variables become unavailable and standard backstepping cannot be applied. To overcome this difficulty, a switching-type adaptive state estimator is constructed. Based on an improved average dwell time method incorporated by frequency and duration properties of DoS attacks, convex design conditions of controller parameters are derived in term of solving a set of linear matrix inequalities. The proposed controller guarantees that all closed-loop signals remain bounded, while the error signals converge to a small neighborhood of the origin. As an illustrative example, the proposed control scheme is applied to a power network system.
网络物理系统（CPSs）本质上是高度互联的，具有复杂的非线性。本文研究了具有间歇式拒绝服务（DoS）攻击的 CPSs 的分散自适应输出反馈控制问题。所考虑的 CPSs 被建模为一类非线性不确定严格反馈互联系统。当 DoS 攻击活跃时，所有状态变量都变得不可用，标准的回溯法无法应用。为了克服这一困难，构建了一种切换式自适应状态估计器。基于包含 DoS 攻击频率和持续时间特性的改进平均驻留时间方法，以求解一组线性矩阵不等式的形式，推导出控制器参数的凸设计条件。所提出的控制器保证所有闭环信号保持有界，同时误差信号收敛到原点的小邻域内。作为一个说明性示例，将所提出的控制方案应用于电网系统。
