基于VMD和排列熵的海缆振动信号降噪方法  

Denoising method for submarine cable vibration signals based on VMD and permutation entropy

作　　者：郭家兴 钱君霞[1] 闫安心 赵盛杰[1] GUO Jiaxing;QIAN Junxia;YAN Anxin;ZHAO Shengjie(Jiangsu Keneng Electric Power Engineering Consulting Co.,Ltd.,Nanjing 210036 China)

机构地区：[1]江苏科能电力工程咨询有限公司,南京210036

出　　处：《光通信技术》2024年第2期84-89,共6页Optical Communication Technology

摘　　要：为了有效去除信号中的噪声,提出了基于变分模态分解(VMD)和排列熵(PE)的海缆振动信号降噪方法。该方法首先使用VMD将信号分解成从高频到低频的数个本征模态函数,然后计算各模态分量的PE值定量表征其随机性程度。接着,对含噪声信息较多的本征模函数(IMF)分量进行小波阈值降噪,并通过信号重构得到降噪后的海缆振动信号。为了验证该方法的有效性,搭建了基于布里渊光时域分析(BOTDA)的海底电缆(海缆)振动信号监测模拟实验系统,通过实验获得了冲刷、摩擦、锚砸3种工况下的海缆振动信号。实验结果表明:所提方法能有效去除海缆振动信号中的高频噪声,其冲刷、摩擦及锚砸3类信号的信噪比分别提升至30.2578 dB、29.6354 dB、38.7862 dB,且标准差较低。In order to effectively remove noise from the signal,a denoising method for submarine cable vibration signals based on variational mode decomposition(VMD)and permutation entropy(PE)is proposed.This method first uses VMD to decompose the signal into several intrinsic mode functions from high frequency to low frequency,and then calculates the PE values of each mode component to quantitatively characterize its degree of randomness.Next,wavelet thresholding is applied to the intrinsic mode function(IMF)components with more noisy information,and the denoised submarine cable vibration signal is obtained through signal reconstruction.In order to venify the effectiveness of this method,a simulation experimental system for monitoring the vibration signals of submarine cables based on Brillouin optical time-domain analysis(BOTDA)is established.The vibration signals of submarine cables under three working conditions of erosion,friction,and anchoring are obtained through experiments.The experimental results show that the proposed method can effectively remove high frequency noise in submarine cable vibra-tion signals.The signal-to-noise ratios of the three types of signals,namely erosion,friction,and anchoring.are increased to 30.2578 dB,29.6354 dB,and 38.7862 dB,respectively,with a low standard deviation.

关 键 词：海底电缆 降噪 布里渊光时域分析 振动监测 

分 类 号：TN911.6[电子电信—通信与信息系统]