This article investigates the sensor attack detection and isolation problems for cyber‐physical systems under attacked situation. To begin with, an overall system is constructed for the network of dynamic system and all the issues are dealt with for the overall system instead of every subsystem. Then, we prove that the preconditions which are made on the original subsystem can be transferred on to the overall system. After this, for the overall system, a sliding mode observer that is robust to the disturbance but sensitive to the sensor attack is designed as sensor attack detector to issue an alarm when at least one subsystem is attacked. In addition, we cope with the sensor fault isolation problem by building an augmented descriptor system for the overall system and we further prove that the precondition can be kept for the augmented descriptor system. Then, another robust sliding mode observer is designed to reach the goal of attack isolation. Finally, a simulation example is given to verify the effectiveness of the proposed methods.

中文翻译：

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基于滑模观察器的网络物理系统传感器攻击检测与隔离

本文研究了受攻击情况下网络物理系统的传感器攻击检测和隔离问题。首先，为动态系统网络构建一个整体系统，并为整个系统而不是每个子系统解决所有问题。然后，我们证明了在原始子系统上进行的前提可以转移到整个系统上。此后，对于整个系统，将对干扰稳定但对传感器攻击敏感的滑模观察器设计为传感器攻击检测器，以在至少一个子系统受到攻击时发出警报。此外，我们通过为整个系统建立一个增强的描述符系统来解决传感器故障隔离问题，并且我们进一步证明了可以为增强的描述符系统保留前提。然后，设计了另一个健壮的滑模观察器以达到攻击隔离的目的。最后，给出了一个仿真实例，验证了所提方法的有效性。