Application of Wavelet Direct Reconstruction Algorithm in Distributed Vibration Sensing Signal Identification for Φ-OTDR
The phase-sensitive optical time-domain reflectometry(Φ-OTDR)distributed vibration sensing system requires a recognition algorithm to identify regular vibration signals from random noise in order to locate the vibration source.The traditional wavelet direct reconstruction algorithm has only been applicable for the identification of known frequency vibration signals.The acquired backscattered Rayleigh signals are now subject to complete wavelet decomposition and hierarchical reconstruction within the measurable frequency range,followed by dynamic threshold-based signal determination.Experi-mental results demonstrate that this method can successfully identify unknown frequency signals within the measurable frequency range,particularly able to distinguish very low-frequency vibrations,and the time consumption is comparable to the Moving Average-Moving Difference algorithm.
Φ-OTDRwavelet noise depressingmoving average moving difference algorithmsignal recognition
万方数据
维普
