DoS攻击下网络控制系统的记忆型事件触发控制

针对一类网络化控制系统,当考虑网络控制系统遭受PWM (Pulsewidth-Modulated)型DoS (Denial-of-Service , DoS)攻击时,提出一种基于缓存机制的记忆型事件触发机制策略.本文考虑的DoS攻击可检测,并且攻击的周期时长以及每周期内的最短休眠时间已知.为了减少网络控制系统中数据包的发送频次,本文设计了基于相对误差的新型事件触发策略,与传统事件触发策略相比,通过增加缓存器来有效利用已经发送的历史采样数据,最终达到改善系统动态过程的目的.接下来,综合考虑网络攻击和事件触发方案,建立了网络化切换系统模型,构造分段李雅普诺夫泛函,推导出系统指数稳定的结论并且对控制器增益及事件触发参数进行协同设计.最后,通过仿真案例,验证了所提出方法的有效性.

Memory-Event-Triggered Control of Networked Control Systems Subject to DoS Attacks

This paper considers a class of networked control systems subject to periodic pulsewidth-modulated (PWS) denial-of-service (DoS) attacks, the information of which is partially known. The DoS attack is considered under the assumption that it could be monitored and the period of the jammer and a uniform lower bound on the jammer's sleeping time are known. To reduce the release frequency of packets in NCSs, a novel memory-event-triggered novel scheme based on relative errors is first proposed. Compared with the traditional event-triggered scheme, the proposed scheme allows the event generator to compare the newest sampled packet with much more recent released packets by using buffers. In this way, the control performance can be improved. Next, by combining the DoS attacks with the memory-event-triggered scheme, a switched networked control system was constructed. The exponential stability criteria have been derived using the piecewise Lyapunov method.