| 基于小波变换的光纤周界定位系统 |
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| 引用本文： | 钟翔,张春熹,林文台,梁生.基于小波变换的光纤周界定位系统[J].北京航空航天大学学报,2013,39(3):396-400. |
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| 作者姓名： | 钟翔 张春熹 林文台 梁生 |
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| 作者单位： | 北京航空航天大学惯性技术国防重点实验室,北京,100191;北京交通大学物理系,北京,100044 |
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| 摘 要： | 为提高基于双Mach-Zehnder干涉仪结构的光纤周界定位系统的定位精度,对信号频率范围及信噪比对系统定位精度的影响进行了理论分析和仿真研究.在此基础上,提出在选用光缆时需要兼顾对外界振动的敏感性和对外场复杂环境的适应性,以确保在长期可靠运行的前提下,扩展采集信号的频率范围;使用小波阈值降噪算法,提取振动信号的有效频率成分,滤除噪声,提高信噪比.最后进行了监测距离31 km的外场实验,验证了所选用光缆的优良性能和小波降噪算法的有效性.
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| 关 键 词： | 光纤传感器 振动测量 位置测量 小波变换 降噪 |
| 收稿时间： | 2012-02-21 |
Fiber-optic perimeter location system based on wavelet transformation |
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| Zhong Xiang Zhang Chunxi Lin WentaiNational Key Lab of Inertial Technology,Beijing University of Aeronautics and Astronautics,Beijing,China Liang Sheng.Fiber-optic perimeter location system based on wavelet transformation[J].Journal of Beijing University of Aeronautics and Astronautics,2013,39(3):396-400. |
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| Authors: | Zhong Xiang Zhang Chunxi Lin WentaiNational Key Lab of Inertial Technology Beijing University of Aeronautics and Astronautics Beijing China Liang Sheng |
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| Institution: | 1. National Key Lab of Inertial Technology, Beijing University of Aeronautics and Astronautics, Beijing 100191, China;
2. Department of Physics, Beijing Jiaotong University, Beijing 100044, China |
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| Abstract: | In order to improve the location accuracy of dual Mach-Zehnder interferometic based fiber-optic perimeter location system, the influence of signal frequency range and signal noise ratio (SRN) was analyzed and emulated. Basing on these, a fiber cable, which combines the high-sensitivity to vibration and the adaptability to complex environment, was adopted to ensure the reliability and extend the signal frequency range. The wavelet de-noising algorithm was employed to extract the effective frequency component, filter the noise and advance the SNR. Finally, a field test with 31 km monitoring length was carried out to justify the excellent performance of the proposed fiber cable and the effectiveness of the wavelet de-noising algorithm. |
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