基于Φ-OTDR的SV-VMD振动定位及信号恢复方法  

SV-VMD vibration localization and signal recovery method based onΦ-OTDR

作　　者：熊培元 徐韶华 黎恒 陈大华 陈聪 杨松 杜浩 XIONG Peiyuan;XU Shaohua;LI Heng;CHEN Dahua;CHEN Cong;YANG Song;DU Hao(Guangxi Beitou IT Innovation Technology Investment Group Co.,Ltd.,Nanning 530200,China;School of Optoelectronic Engineerging,Guilin University of Electronic Technology,Guilin Guangxi 541004,China)

机构地区：[1]广西北投信创科技投资集团有限公司,南宁530200 [2]桂林电子科技大学光电工程学院,广西桂林541004

出　　处：《光通信技术》2025年第2期40-43,共4页Optical Communication Technology

基　　金：广西重点研发计划项目(桂科AB22035047)资助;广西研究生教育创新计划项目(YCBZ2023133)资助。

摘　　要：针对传统相位差分法在振动定位中因信噪比不足导致的定位精度低和信号恢复困难问题,提出一种基于相位敏感光时域反射仪(Φ-OTDR)的滑动方差变分模态分解(SV-VMD)振动定位及信号恢复方法。SV算法通过滑动窗口计算相位差分方差,选取振动点前10 m的相位作为修正参考相位,有效抑制累积噪声;VMD通过多尺度分解分离有效信号分量与趋势噪声,消除正交解调引入的直流偏移。实验结果表明:与传统相位差分法相比,SV算法使系统信噪比提升12 d B(从14 d B至26 d B),并在多振动源场景下清晰分辨了400 m和650 m处的干扰事件;经参数优化(惩罚因子α=100,模式数K=3)的VMD算法成功恢复了三角波信号,显著抑制了非振动相关噪声。In response to the issues of low localization accuracy and signal recovery difficulties caused by insufficient signal-to-noise ratio in traditional phase difference methods for vibration localization,a sliding variance variational mode decomposition(SV-VMD)vibration localization and signal recovery method based on phase-sensitive optical time-domain reflectometer(Φ-OTDR)is proposed.The SV algorithm calculates the phase difference variance via a sliding window and selects the phase within the 10 m range preceding the vibration point as the corrected reference phase,effectively suppressing cumulative noise.The VMD algorithm separates the effective signal component from trend noise through multi-scale decomposition,thereby eliminating direct current offsets induced by orthogonal demodulation.The experimental results demonstrate that compared to conventional differential methods,the SV algorithm improves the system signal-to-noise ratio by 12 dB(from 14 dB to 26 dB)and clearly resolves interference events at 400 m and 650 m in multi-vibration-source scenarios.The VMD algorithm with optimized parameters(penalty factorα=100,mode number K=3)successfully recovers the triangular wave signal and significantly suppresses non-vibration-related noise.

关 键 词：相位敏感光学时域反射仪 振动定位 滑动方差 相位解调 变分模态分解 

分 类 号：TN256[电子电信—物理电子学]