基于小波包分解和SVM的φ-OTDR系统信号识别  

Signal Recognition of φ-OTDR System Based on Wavelet Packet Decomposition and SVM

作　　者：卜泽华 毛邦宁 司召鹏 龚华平 徐贲 康娟 李裔 赵春柳 BU Zehua;MAO Bangning;SI Zhaopeng;GONG Huaping;XU Ben;KANG Juan;LI Yi;ZHAO Chunliu(Institute of Optoelectronic Technology,China Jiliang University,Hangzhou 310018,China)

机构地区：[1]中国计量大学光学与电子科技学院,杭州310018

出　　处：《光子学报》2022年第11期79-87,共9页Acta Photonica Sinica

基　　金：国家重点研发计划(No.2020YFF0217801)。

摘　　要：针对基于相位敏感光时域反射计的分布式光纤传感系统的信号识别实时性和准确性问题,提出一种基于小波包分解和支持向量机的信号识别方法。通过小波包分解提取信号的能量特征向量并分析不同信号的平均能量分布趋势。采用支持向量机对敲击、晃动、行走和噪声四种信号共800个实验样本进行训练和识别,识别效果由精确率、召回率、F1值和准确率四种评估指标进行评价。实验结果显示敲击信号和晃动信号的识别精确率、召回率和F1值分别为94.12%、96%、95.05%;95.92%、94%、94.95%;行走信号和噪声信号的识别精确率、召回率和F1值均为100%;总体识别准确率在97%以上。该方法提高了相位敏感光时域反射系统在信号识别时的准确性和实时性。With the rapid development of the Internet of Things era,the perception and acquisition of all kinds of external information is becoming increasingly important.Traditional monitoring and warning technologies such as manual inspection,video surveillance,infrared detection,and microwave detection have been widely used in various fields.Although these technologies have succeeded,they are expensive,environmentally sensitive,and cannot be monitored over long distances.To realize real-time and environment-free long-distance monitoring,distributed optical fiber sensing technology has developed rapidly in recent years.Distributed optical fiber sensing uses the whole optical fiber as the signal′s transmission medium and sensing unit.When external factors act on the optical fiber,the light wave transmitted in it is modulated accordingly,and its light intensity,frequency,phase or polarization state,and other parameters will change accordingly.Distributed optical fiber sensing has the advantages of flexible layout,high cost performance and wide measurement range.Compared with traditional methods,distributed optical fiber sensing realizes large-scale measurement at a lower cost.As an important branch of distributed optical fiber sensor,phase sensitive optical-time domain reflectometer has the advantages of high sensitivity,high resolution and simple structure.At present,φ-OTDR plays an important role in many applications,such as structural crack detection,railway monitoring,traffic flow detection,vehicle detection and intrusion detection.With the development of modern productive forces and the diversification of life scenes,simple vibration location and signal demodulation cannot meet the actual needs and user needs.Random interference in nature(such as thunderstorm,wind,hail,etc.),passing vehicles and moving personnel will interfere with the accurate recognition of intrusion signals,increasing the false alarm rate.It is hoped that the type of vibration signal can be obtained at the same time as the location of the vibrati

关 键 词：相位敏感光时域反射计 信号识别 小波包分解 支持向量机 能量特征向量 

分 类 号：TN247[电子电信—物理电子学]