Interval Observer Design Under Stealthy Attacks and Improved Event-Triggered Protocols
Interval Observer Design Under Stealthy Attacks and Improved Event-Triggered Protocols
复制标题
隐形攻击下的间隔观察器设计和改进的事件触发协议
DOI：
10.1109/tsipn.2020.3012254
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发表时间：
2020-07
影响因子：
3.2
通讯作者：
Derui Ding
中科院分区：
文献类型：
--
作者：
Xin Li;Guoliang Wei;Derui Ding
研究了一类离散非线性网络系统在隐身攻击下的区间估计问题。采用一种改进的事件触发的时变门限协议对间隔观测器的接收信号进行控制，以减少不必要的数据通信负担。在传感器和工厂中发生的秘密攻击通常来自开放的网络环境。针对该问题，提出了一种新的区间观测器来估计系统状态和隐身攻击的界。利用正系统理论和李雅普诺夫稳定性理论，给出了系统稳定的一个充分条件.此外，所需的观测器增益获得的某些矩阵不等式的解决方案。与传统的将攻击视为有界干扰的方法相比，该方法能有效降低估计性能的保守性，避免所设计观测器在实际工程中的实现困难。最后，通过数值仿真验证了所提出的区间观测器的有效性。
In this article, an interval estimation problem is investigated for a class of discrete-time nonlinear networked systems under stealthy attacks. An improved event-triggered protocol with the time-varying threshold is adopted to govern the received signals of interval observer so as to reduce unnecessary data communication burden. Stealthy attacks occurring in both the sensors and the plant come typically from open networked environments. For the addressed issue, a novel interval observer is developed to estimate the bounds of both system states and stealthy attacks. A sufficient condition is proposed by using the positive system theory and Lyapunov stability theory. Furthermore, the desired observer gain is obtained in terms of the solution to certain matrix inequalities. In comparison with the traditional approach that attacks are regarded as bounded disturbances, the estimated upper and lower bounds of attack signals can effectively reduce the conservatism of estimation performance, and avoid the implementation difficulties of the designed observer in practical engineering. Finally, the effectiveness of the proposed interval observers is verified by a numerical simulation.
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