arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2106.07992cs.LGcs.CRstat.ML
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基于神经系统辨识和贝叶斯滤波的信息物理系统时序异常检测

Time Series Anomaly Detection for Cyber-Physical Systems via Neural System Identification and Bayesian Filtering

Siemens AG(西门子股份公司)

Cheng Feng, Pengwei Tian

摘要:

AIoT技术的最新进展已经导致利用机器学习算法来检测网络物理系统(CPS)的操作故障的日益普及。在其基本形式中,异常检测模块监视来自物理设备的传感器测量和致动器状态,并且检测这些测量中的异常以识别异常操作状态。然而,建立有效的异常检测模型CPS是相当具有挑战性的,因为该模型必须准确地检测异常的高度复杂的系统动态和未知量的传感器噪声的存在。在这项工作中,我们提出了一种新的时间序列异常检测方法,称为神经系统辨识和贝叶斯过滤(NSIBF),其中一个特制的神经网络架构构成的系统辨识,即,在动态状态空间模型中捕获CPS的动态;然后贝叶斯滤波算法自然地应用于“识别的”状态空间模型之上,用于通过随时间递归地跟踪系统的隐藏状态的不确定性来进行鲁棒异常检测。我们提供了定性和定量的实验与所提出的方法在合成和三个现实世界的CPS数据集,显示NSIBF相比有利的国家的最先进的方法,在CPS异常检测有很大的改进。

英文摘要:

Recent advances in AIoT technologies have led to an increasing popularity of utilizing machine learning algorithms to detect operational failures for cyber-physical systems (CPS). In its basic form, an anomaly detection module monitors the sensor measurements and actuator states from the physical plant, and detects anomalies in these measurements to identify abnormal operation status. Nevertheless, building effective anomaly detection models for CPS is rather challenging as the model has to accurately detect anomalies in presence of highly complicated system dynamics and unknown amount of sensor noise. In this work, we propose a novel time series anomaly detection method called Neural System Identification and Bayesian Filtering (NSIBF) in which a specially crafted neural network architecture is posed for system identification, i.e., capturing the dynamics of CPS in a dynamical state-space model; then a Bayesian filtering algorithm is naturally applied on top of the "identified" state-space model for robust anomaly detection by tracking the uncertainty of the hidden state of the system recursively over time. We provide qualitative as well as quantitative experiments with the proposed method on a synthetic and three real-world CPS datasets, showing that NSIBF compares favorably to the state-of-the-art methods with considerable improvements on anomaly detection in CPS.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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