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Pattern recognition method for fiber-optic distributed disturbance sensor

A fiber optic distributed, pattern recognition technology, applied in the direction of character and pattern recognition, instruments, computer components, etc., can solve the problems of unsatisfactory effect of sensing signal pattern recognition, inability to extend time judgment, etc., to achieve high accuracy, Low false alarm rate and high efficiency

Inactive Publication Date: 2013-08-07
BEIJING JIAOTONG UNIV
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Problems solved by technology

The most common classification method is SVM. However, the SVM method and ANN recognition have the same shortcomings, and they cannot make good judgments on time extension.
[0011] Existing pattern recognition methods are not designed and optimized specifically for fiber optic distributed disturbance sensors, and the effect of pattern recognition on sensing signals is not ideal

Method used

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  • Pattern recognition method for fiber-optic distributed disturbance sensor
  • Pattern recognition method for fiber-optic distributed disturbance sensor
  • Pattern recognition method for fiber-optic distributed disturbance sensor

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Embodiment

[0027] figure 1 It is a flowchart of a method for pattern recognition of an optical fiber distributed disturbance sensor provided by an embodiment of the present invention. Such as figure 1 As shown, the method mainly includes the following steps:

[0028] Step 11, according to the output signal I of the optical fiber distributed disturbance sensor according to the time period 1 (t) Perform M times of sampling to obtain N sampling points divided according to time segments.

[0029] The embodiment of the present invention performs pattern recognition based on frequency and time distribution characteristics. Therefore, it is necessary to analyze the output signal I of the fiber optic distributed disturbance sensor 1 (t) Sampling is performed by time period. For example, perform M (a positive integer greater than 0) sampling according to the time period, and obtain N (a positive integer greater than or equal to M) sampling points divided according to the time period; usually...

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Abstract

The invention discloses a pattern recognition method for a fiber-optic distributed disturbance sensor. The method includes: sampling an output signal I1 (t) of the fiber-optic distributed disturbance sensor for M times according to periods of time so as to obtain N sample points divided according to the periods of time, N > / =M; calculating zero-crossing rate F(i) of the sample point in the i-th period of time, and calculating equivalent frequency f(i) in the current period of time according to the zero-crossing rate F(i) to obtain frequency and time distribution characteristics of the sensor output signal in the current period of time; and recognizing patterns according to the frequency and time distribution characteristics of the sensor output signal. By the use of the method, recognition efficiency and accuracy are increased, and false alarm rate is reduced.

Description

technical field [0001] The invention relates to the technical field of optical fiber distributed disturbance sensors, in particular to a method for pattern recognition of optical fiber distributed disturbance sensors. Background technique [0002] The optical fiber distributed disturbance sensor can detect, identify and locate the disturbance at any point on the sensing fiber. With its important technical advantages such as long monitoring distance, positionability, and no need for external power supply, it can be widely used in perimeter security and early warning of oil and gas pipelines , communication line monitoring and large structure monitoring. [0003] The working process of the optical fiber distributed disturbance sensor is to detect external disturbance signals, perform pattern recognition on the disturbance signals, and determine whether to make an alarm judgment. The working performance of the fiber optic distributed disturbance sensor can be described by thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/62
Inventor 梁生盛新志娄淑琴王思远陈京惠
Owner BEIJING JIAOTONG UNIV
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