POTDR (polarization optical time domain reflectometer) based optical fiber intrusion recognition algorithm

A recognition algorithm and optical fiber technology, applied in character and pattern recognition, computing, computer components, etc., can solve the problems of low positioning accuracy and low reliability of intrusion recognition, so as to improve reliability, avoid accidental defects, and reduce system errors Effect

Active Publication Date: 2015-07-22
武汉世纪金桥安全技术有限公司
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Problems solved by technology

[0005] The present invention provides a POTDR-based optical fiber intrusion identification algorithm, which solves the problems of low intrusion identification reliability and low positioning accuracy in the prior art, and greatly improves the reliability and positioning accuracy of intrusion identification

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  • POTDR (polarization optical time domain reflectometer) based optical fiber intrusion recognition algorithm
  • POTDR (polarization optical time domain reflectometer) based optical fiber intrusion recognition algorithm
  • POTDR (polarization optical time domain reflectometer) based optical fiber intrusion recognition algorithm

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Embodiment Construction

[0045] This embodiment provides a POTDR-based optical fiber intrusion recognition algorithm, which solves the problems of low signal-to-noise ratio, high false alarm rate of intrusion recognition, low alarm reliability and low positioning accuracy in the prior art. The technical effect of improving the efficiency of intrusion identification, improving the reliability of health care functions and positioning accuracy has been achieved.

[0046] In order to solve the above technical problems, the general idea of ​​the technical solution provided by the embodiment of the present application is as follows:

[0047] A fiber intrusion identification algorithm based on POTDR, including:

[0048] Read the raw data of 2N periods collected by the fiber optic vibration sensor from the data acquisition end and perform denoising;

[0049] Divide the denoised array X into two groups, and calculate the difference △X;

[0050] Dividing the difference array ΔX into multiple equal-length wind...

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Abstract

The invention belongs to the technical field of optical fiber sensing and discloses a POTDR (polarization optical time domain reflectometer) based optical fiber intrusion recognition algorithm. The algorithm includes reading initial data of 2N cycles which are acquired by an optical fiber vibration sensor at an acquisition terminal and then denoising; dividing an array X acquired after denoising and solving the difference value deltaX; dividing the difference value deltaX into multiple equal-length window arrays to form an array Y; calculating forth-order central distance of the window arrays of the array Y, comparing the forth-order central distance with the set threshold D, calibrating the above-threshold data Yaj of the array Y, and inputting the subscript aj to a coordinate array A; positioning an alarm point according to the minimum value amin of the array A, and repeating the step to perform the next recognition if no above-threshold array exists. Specifically, the arrangement mode of the initial data is consistent with the arrangement mode of sampling points of the optical fiber sensor, the subscripts of the window arrays are coordinates of the corresponding sampling points; the coordinates of the sampling points represent optical length of the sampling points in the optical fiber. With the window arrays, reliability and positioning accuracy of the intrusion recognition algorithm are improved.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a POTDR-based optical fiber intrusion identification algorithm. Background technique [0002] Due to its advantages in anti-electromagnetic interference, good electrical insulation, corrosion resistance, high sensitivity, and passive sensing units, distributed optical fiber vibration sensing systems are widely used in monitoring and protecting borders, military bases, oil and gas pipelines, and power transmission cables. and other important areas and places. [0003] The system hardware is composed of computer, data acquisition card, optical detector, pulse light source, sensing fiber optic link, optical circulator, and online polarizer. After the data is collected by the data acquisition card, it is transmitted to the computer for further algorithm processing. The signal light of a standard POTDR sensing system comes from the backward Rayleigh scattering of a forw...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B13/12G06K9/40
CPCG08B13/124G06V10/30
Inventor 董晖唐明王超东曹锋
Owner 武汉世纪金桥安全技术有限公司
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