周期拒绝服务干扰攻击下信息物理系统的H_∞控制

H∞ control for cyber-physical system under periodic denial-of-service jamming attack

针对恶意拒绝服务(DoS)干扰攻击对信息物理系统(CPS)正常运行的影响,研究DoS干扰攻击下某类CPS的H∞控制问题.能量受限的DoS干扰者采用周期型攻击策略攻击CPS中的无线信道,迫使无线信道的通信质量下降;CPS的无线信道存在由固有因素引起的随机数据包丢失,且由于恶意网络攻击具有突发性和隐蔽性的特点,DoS干扰者的攻击策略是未知的.将恶意DoS干扰攻击和无线信道固有因素对信道通信质量的影响表示为统一形式,并通过建立攻击容忍机制和基于观测器的控制策略,得到保证受攻击CPS在未知攻击者具体攻击策略的情况下能够实现指数均方稳定且满足预期H∞性能指标的充分条件,将H∞控制器的设计问题转化为凸优化问题的求解.利用数值仿真验证所提出控制策略的正确性和有效性.

The H∞control problem of a class of cyber-physical system(CPS)under malicious denial-of-service(DoS)jamming attack was researched,aiming at the influence of the DoS jamming attack on the CPS.An energy constrained DoS jammer with periodic attack strategy attacks the wireless channel in the CPS,decreasing the communication quality.Random packet dropouts caused by inherent factors exist in the wireless channel,and the DoS jammer’s attack strategy is unknown due to that DoS jamming attacks have the characteristics of suddenness and concealment.By expressing the influence of malicious DoS jamming attacks and the inherent factors in the wireless channel into a unified form and establishing an attack tolerance mechanism and an observer-based control strategy,sufficient conditions were obtained to guarantee the exponential mean square stability of the attacked CPS without knowing DoS jammer’s concrete attack strategy,and the prescribed H∞performance index can be achieved simultaneously.The design of the H∞controller is transformed into the solving of a convex optimization problem.Numerical simulations were used to demonstrate the correctness and effectiveness of the control strategy.