IEEE Trans Cybern. 2022 Sep;52(9):9609-9620. doi: 10.1109/TCYB.2021.3060743. Epub 2022 Aug 18.
This article is concerned with the secure state estimation problem for cyber-physical systems under intermittent denial-of-service (DoS) attacks. Based on a switching scheme and the cascade observer technique, a novel resilient state observer with a switched compensation mechanism is designed. Moreover, a quantitative relationship between the resilience against DoS attacks and the design parameters is revealed. Compared with the existing results, where only the boundedness of the estimation error is guaranteed under DoS attacks, the exponential convergence of the estimation error is achieved by employing the proposed observer scheme, such that the estimation performance is improved. More specifically, in the disturbance-free case, it is proven that the state estimation error converges exponentially to 0 despite the existence of DoS attacks. Finally, simulation results are provided to illustrate the effectiveness and merits of the proposed methods.
本文针对遭受间歇性拒绝服务（DoS）攻击的网络物理系统的安全状态估计问题，基于切换方案和级联观测器技术，设计了一种具有切换补偿机制的新型弹性状态观测器。此外，揭示了弹性抗 DoS 攻击能力与设计参数之间的定量关系。与现有结果相比，现有结果仅保证在 DoS 攻击下估计误差的有界性，通过采用所提出的观测器方案，实现了估计误差的指数收敛，从而提高了估计性能。更具体地说，在无干扰的情况下，证明了即使存在 DoS 攻击，状态估计误差也会指数收敛到 0。最后，提供了仿真结果以说明所提出方法的有效性和优点。
