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Optical fiber perimeter protection method against wind and rain interference

A fiber optic perimeter, wind and rain technology, applied in the direction of alarms, anti-theft alarms, anti-theft alarms, etc. that rely on broken/disturbed straightened ropes/metal wires, etc., can solve problems such as difficult to accurately identify human intrusions, Achieve accurate and effective alarm response, retain data characteristics, and reduce processing volume

Active Publication Date: 2017-10-10
杭州安远科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In non-bad weather conditions and uncomplicated environmental conditions, intrusion actions can be accurately determined. However, in harsh environments and more interference conditions, it is difficult to accurately identify human intrusions.
Especially in strong wind and rain, the signal generated by the vibration of the optical cable due to strong wind and rain is similar in strength and frequency to the signal generated by some man-made intrusion actions, so many false alarms will occur
To ensure that false alarms do not occur when it rains, some human intrusions cannot be judged as intrusions by the system under normal weather conditions.

Method used

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  • Optical fiber perimeter protection method against wind and rain interference
  • Optical fiber perimeter protection method against wind and rain interference
  • Optical fiber perimeter protection method against wind and rain interference

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] figure 1 A flow chart of the fiber perimeter protection method against wind and rain interference in Embodiment 1 of the present invention is schematically given, as figure 1 As shown, the optical fiber perimeter protection method includes the following steps:

[0052] (A1) The optical fiber senses external vibration, and the sensed vibration signal is transmitted to the host;

[0053] (A2) The host samples the sensing signal, and counts the sampling signal effectively, specifically:

[0054] Sampling the acquisition signal received by the host, when the voltage of the acquisition signal exceeds 3.5V, the alarm host will sample the signal at a sampling frequency of 250k bps, and a data frame is a data segment within one second. Make statistics on the sampling signal containing 512 sampling data, and count the number of times the sampling signal crosses the effective rising level and the effective rising level + noise margin. The range of the effective rising level is ...

Embodiment 2

[0079] An application example of the optical fiber perimeter protection method according to Embodiment 1 of the present invention.

[0080] In this application example, the fiber perimeter protection methods are as follows:

[0081] (A1) The optical cable installed on the fence is collided, and the vibration signal sensed by the front-end sensor equipment is output to the rear-end alarm host; the rear-end alarm host samples the received acquisition signal;

[0082] (A2) Schematic diagram of the effective rise of the statistical signal, set the crossover level to 2.048V, and the noise margin to 0.12V. The effective number of rises of each sampling signal containing 512 sampling data is the black rectangle mark, so the crossover after processing the signal is obtained The times are 8, 7, 6 respectively, such as Figure 5 As shown, the amount of data after statistical processing is only 1 / 512 of the original, which provides great convenience for the subsequent processing of the ...

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Abstract

The invention provides a wind and rain interference resistant optical fiber perimeter protection method, and the optical fiber perimeter protection method comprises the following steps: (A1) an optical fiber perceives the external vibration, and a perception signal is transmitted to a host; (A2) the host samples the perception signal and performs the effective increasing statistics to the sampled signal; (A3) a dynamic average algorithm is used for processing the data of the effective increasing statistics; (A4) the data is performed the smooth accumulation; (A5) the data of the smooth accumulation is segmented, and segment signals are dynamically fixed, so that each segment comprises a complete action; (A6) eigenvectors of dynamically fixed segment signals are extracted and are put in a well-trained classifier, whether the relative system alarms according to an event mode represented by the output result of the classifier. The method has advantages of high interference resistant ability and the like.

Description

technical field [0001] The invention relates to optical fiber perimeter protection, in particular to an optical fiber perimeter protection method capable of resisting wind and rain interference. Background technique [0002] With the continuous development of my country's economy and science and technology, people's awareness of safety precautions is getting stronger and stronger, and the safety precautions of living and living around schools, residential quarters, and industrial parks have become more and more concerned about people. Not only that, the perimeter security of complex environments such as oil fields, oil depots, power plants, and airports deserves special attention. Higher requirements are also put forward for the security of important areas related to national security, such as military sites, judicial prisons, and government agencies. Therefore, A safe and effective perimeter security monitoring system is particularly important. [0003] At present, there a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G08B13/12
CPCG08B13/124
Inventor 徐建伟詹璐瑶邓志辉韩晓阳
Owner 杭州安远科技有限公司