Interference type optical fiber perimeter vibration intrusion recognition algorithm

An optical fiber perimeter, identification algorithm technology, applied in the direction of alarms that rely on interference with short-wavelength radiation, can solve the problems of signal identification, difficult to accurately identify human intrusion, etc., to achieve the effect of increasing accuracy

Active Publication Date: 2014-03-05
WEIHAI BEIYANG ELECTRIC GRP CO LTD BEIJING BRANCH
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Problems solved by technology

However, no matter what kind of implementation principle is adopted, there will always be a problem of signal recognition, especially in the harsh environment and many interference conditions, it is difficult to accurately identify human intrusion

Method used

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  • Interference type optical fiber perimeter vibration intrusion recognition algorithm
  • Interference type optical fiber perimeter vibration intrusion recognition algorithm
  • Interference type optical fiber perimeter vibration intrusion recognition algorithm

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Embodiment

[0046]The present invention is a technical scheme of multi-eigenvalue analysis based on classical mode decomposition (EMD). It is decomposed into several intrinsic mode functions (IMF) from high frequency to low frequency, so as to obtain the instantaneous frequency parameters with physical meaning. The EMD algorithm is very sensitive to the suddenness of the signal, and can retain its suddenness after decomposition; Multiple coupled signals of different frequencies are separated to achieve decoupling between signals, which is conducive to further analysis and processing of signals, and avoids redundant problems such as false frequencies and redundant signal components; compared with simple monotone functions, an IMF Representing a simple vibration mode, the definition of IMF has two conditions: (1) the number of zero-crossing points and the number of extreme points in its data are equal or differ by at most one; (2) its local maximum and minimum The mean values ​​of the upper...

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Abstract

The invention relates to the technical field of optical fiber vibration sensing and in particular relates to an interference type optical fiber perimeter vibration intrusion recognition algorithm suitable for security perimeter. The interference type optical fiber perimeter vibration intrusion recognition algorithm is characterized by comprising the following operations: reading data acquired by an optical fiber vibration sensor from a data acquisition end, and normalizing the acquired data; performing empirical mode decomposition; calculating a characteristic value of an empirical mode decomposition result; detecting multiple characteristic values, judging whether intrusion exists, if so, alarming, otherwise repeating the steps 1-5 for performing recognition in the next round. Compared with the prior art, the interference type optical fiber perimeter vibration intrusion recognition algorithm has the advantages that an original signal is subjected to empirical mode decomposition, the judgment accuracy is improved, the possibility that false alarm is caused due to a certain occasional specific characteristic can be eliminated by adopting a multi-characteristic value threshold detection mode, and intrusion alarm can be accurately realized under the condition that interferences of wind, rain, vehicles and the like exist.

Description

technical field [0001] The invention relates to the technical field of optical fiber vibration sensing, in particular to an interference type optical fiber perimeter vibration intrusion recognition algorithm especially suitable for an interference type optical fiber perimeter security system for security perimeters. Background technique [0002] With the development of social economy and science and technology, people's awareness of security has gradually increased, especially for oil depots, national defense, various chemical plants, fuel depots, nuclear power plants, docks and other important areas related to national security, followed by security monitoring The facilities are endless. Compared with the traditional security monitoring methods, such as manual monitoring, infrared radiation, electronic fence and many other security intrusion systems, the interference fiber optic perimeter security system has the advantages of high temperature and high pressure resistance, a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08B13/18
Inventor 乔秋晓王建强梁明明张凯
Owner WEIHAI BEIYANG ELECTRIC GRP CO LTD BEIJING BRANCH
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