基于 LMS 滤波器的Φ-OTDR 脉冲压缩信号简明自适应侧叶抑制算法

IF 2.1 4区物理与天体物理 Q2 OPTICS

Photonics Pub Date : 2024-01-08 DOI:10.3390/photonics11010070

Wei Shen, Xiaofeng Chen, Yong Zhang, Xin Hu, Jian Wu, Lijun Liu, Chuanlu Deng, Chengyong Hu, Yi Huang

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引用次数: 0

摘要

针对相位敏感光时域反射仪（Φ-OTDR）系统的脉冲压缩信号，提出了一种基于最小均方（LMS）滤波器的简明自适应侧叶抑制算法。该算法适用于相位编码 OTDR（PC-OTDR）系统的去噪滤波过程，并可减轻匹配滤波带来的旁瓣效应。在仿真实验中，生成并解码了包括相位编码脉冲信号在内的瑞利后向散射（RBS）信号，验证了 LMS 算法比窗口法和递归最小二乘法（RLS）能更有效地消除边扰。然后，建立 PC-OTDR 系统并结合 LMS 算法进行定位实验。结果表明，信号的峰值边叶比（PSLR）可达 -15.86 dB，比原始脉冲压缩信号低 4.26 dB。

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A Concise and Adaptive Sidelobe Suppression Algorithm Based on LMS Filter for Pulse-Compressed Signal of Φ-OTDR

A concise and adaptive sidelobe suppression algorithm based on a least mean square (LMS) filter is proposed for pulse-compressed signals of a phase-sensitive optical time-domain reflectometer (Φ-OTDR) system. The algorithm is suitable for the denoising filtering process of phase coding OTDR (PC-OTDR) systems and mitigates the sidelobe effect due to matched filtering. In a simulation experiment, Rayleigh backscattering (RBS) signals including phase-coded pulse signals are generated and decoded to verify that the LMS algorithm can eliminate the sidelobes more effectively than the windowing method and the recursive least squares (RLS) method. Then, the PC-OTDR system is set up and combined with the LMS algorithm for positioning experiments. The results show that the peak side lobe ratio (PSLR) of the signals can reach −15.86 dB, which is 4.26 dB lower than the raw pulse compressed signal.

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来源期刊

Photonics Physics and Astronomy-Instrumentation

CiteScore

2.60

自引率

20.80%

发文量

817

审稿时长

8 weeks

期刊介绍： Photonics (ISSN 2304-6732) aims at a fast turn around time for peer-reviewing manuscripts and producing accepted articles. The online-only and open access nature of the journal will allow for a speedy and wide circulation of your research as well as review articles. We aim at establishing Photonics as a leading venue for publishing high impact fundamental research but also applications of optics and photonics. The journal particularly welcomes both theoretical (simulation) and experimental research. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. The full experimental details must be provided so that the results can be reproduced. Electronic files and software regarding the full details of the calculation and experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.