基于PE-CEEMD-SVD的Φ-OTDR信号降噪方法  

Φ-OTDR Signal-Denoising Method Based on PE-CEEMD-SVD

作　　者：姚国珍[1,2,3] 李炳峰 谷元宇 YAO Guozhen;LI Bingfeng;GU Yuanyu(North China Electric Power University Department of Electronic and Communications Engineering;North China Electric Power University Hebei Key Laboratory of Power Internet of Things Technology;North China Electric Power University Baoding Key Laboratory of Optical Fiber Sensing and Optical Communication Technology,Baoding 071003,CHN)

机构地区：[1]华北电力大学电子与通信工程系,河北保定071003 [2]华北电力大学河北省电力物联网技术重点实验室,河北保定071003 [3]华北电力大学保定市光纤传感与光通信技术重点实验室,河北保定071003

出　　处：《半导体光电》2024年第4期662-668,共7页Semiconductor Optoelectronics

基　　金：国家自然科学基金项目(62205105);河北省自然科学基金项目(E2019502179);河北省省级科技计划项目(SZX2020034)。

摘　　要：为实现相位敏感光时域反射仪中相位信号的精确测量,提出了一种基于排列熵算法的互补集合经验模态分解联合奇异值分解的新型降噪方法(PE-CEEMD-SVD)。首先,对含有噪声的相位信号进行CEEMD分解,得到一系列频率不同的IMF分量;然后,将PE算法和相关系数机制相结合,保留较大相关的有用分量,对较小相关的噪声分量使用SVD算法进行二次降噪;最后将两次降噪后保留下来的有用分量进行重构。仿真和实验结果表明,相较于EMD、EEMD和CEEMD降噪方法,该方法可获得更高信噪比的信号,有利于相位信号的精确测量。To precisely measure phase signals in phase-sensitive optical time-domain reflectometers,a novel noise-reduction method is proposed that is based on complementary ensemble empirical modal decomposition coupled with singular value decomposition using a permutation entropy algorithm.Initially,a phase signal containing noise is decomposed via complementary ensemble empirical modal decomposition(CEEMD)to obtain a series of components with different frequencies.Subsequently,the PE algorithm is combined with the correlation coefficient mechanism to retain useful components with a larger correlation,and the singular-value-decomposition algorithm is used to denoise the noise components with a smaller correlation.Finally,the useful components,retained after two denoising processes,are reconstructed.Simulation and experimental results demonstrate that,compared with empirical modal decomposition,ensemble empirical modal decomposition,and CEEMD,the proposed method achieves a higher signal-to-noise ratio,which is beneficial for the precise measurement of phase signals.

关 键 词：相位敏感光时域反射仪 排列熵 互补集合经验模态分解 奇异值分解 信噪比 

分 类 号：TN911.6[电子电信—通信与信息系统]