RT info:eu-repo/semantics/article T1 A Contextual GMM-HMM Smart Fiber Optic Surveillance System for Pipeline Integrity Threat Detection A1 Tejedor Noguerales, Javier A1 Macías Guarasa, Javier A1 Fidalgo Martins, Hugo A1 Martín López, Sonia A1 González Herráez, Miguel K1 Distributed fiber sensing K1 Acoustic sensing K1 Vibration sensing K1 Pipeline integrity K1 Phase-sensitive OTDR K1 Pattern recognition K1 Electrónica K1 Electronics AB This paper presents a novel pipeline integrity surveillance system aimed to the detection and classification of threats in the vicinity of a long gas pipeline. The sensing system is based on phase-sensitive optical time domain reflectometry ( $\phi$ -OTDR) technology for signal acquisition and pattern recognition strategies for threat identification. The proposal incorporates contextual information at the feature level in a Gaussian Mixture Model-Hidden Markov Model (GMM-HMM)-based pattern classification system and applies a system combination strategy for acoustic trace decision. System combination relies on majority voting of the decisions given by the individual contextual information sources and the number of states used for HMM modelling. The system runs in two different modes: (1) machine+activity identification, which recognizes the activity being carried out by a certain machine, and (2) threat detection, aimed to detect threats no matter what the real activity being conducted is. In comparison with the previous systems based on the same rigorous experimental setup, the results show that the system combination from the contextual feature information and the GMM-HMM approach improves the results for both machine+activity identification (7.6% of relative improvement with respect to the best published result in the literature on this task) and threat detection (26.6% of relative improvement in the false alarm rate with 2.1% relative reduction in the threat detection rate). SN 0733-8724 YR 2019 FD 2019-04-02 LK http://hdl.handle.net/10017/39513 UL http://hdl.handle.net/10017/39513 LA eng NO European Commission DS MINDS@UW RD 28-mar-2024