Protection System of Communication Line based on Distributed Interference Fiber Sensing Network

摘要

On the issue of security and protection of communication line, this study designed and realized a new distributedfiber vibration sensing and warning system for hazardous events. Based on M-Z interference principle, the system realizedthe real-time detecting and accurate locating of the vibration signals by means of cross-correlation calculation of thefiber signals, restrained effectively the sensing signal noise and extracted accurately the vibration signals of various hazardousevents with the methods of wavelet threshold shrinkage and Hilbert transform. In the meantime, the study proposedmulti-dimensional features including wavelet decomposition, MFCC coefficients and time-domain envelope to describethe vibration signals and established multi-level classifier models with BP neural network and SVM methods to realizethe classification and recognition of various hazardous events. After the applications and experiments of the systemon 7 hazardous events, we obtained experimental results of the locating accuracy of <100 meters and classifying accuracyrate of 94.35% on hazardous events, which verified the effectiveness of the study.