Method for calculating occurrence positions of pre-warning events in external safety pre-warning and positioning system of photoelectric composite cables

Abstract

The invention discloses a method for calculating occurrence positions of pre-warning events in an external safety pre-warning and positioning system of photoelectric composite cables, which comprises the following two steps: step one, selecting a typical data field, and then calculating the occurrence positions of the events; and step two, performing a wavelet generalized mutual correlation positioning method. Through the two steps of calculations, the external safety pre-warning and positioning system of the photoelectric composite cables detects position information of the pre-warning events. The method for calculating the occurrence positions of the pre-warning events in the external safety pre-warning and positioning system of the photoelectric composite cables saves the investigationtime of event precaution and provides time allowance for the precautionary measures of the events so that correlative personnel can get to the site from nearby and the use efficiency of the personnelis improved; and the method provides a fact basis for the detection of data stealing events from the technical aspects. The implementation process of the method needs no constructions on the prior fiber network but only needs to mount a bidirectional common-path distributed fiber optic interferometer at two ends of a node of a communication optical fiber to achieve the designed functions of the system, thus the method not only is suitable for terrestrial environments but also is suitable for underwater environments, is simple to use, and has wide suitable environments.

Description

technical field [0001] The invention belongs to the field of optoelectronics and information technology, and in particular relates to a method for calculating the position of an early warning event in a photoelectric composite cable external safety early warning positioning system. Background technique [0002] Optical cables and photoelectric composite cables are currently widely used in the optical communication industry and the power industry as an information transmission medium. The operation safety of optical cables and photoelectric composite cables is related to social stability and the protection of national economic interests. Therefore, real-time online early warning and location monitoring of external infringement events during the operation of optical cables and photoelectric composite cables is the key to ensuring their safe operation. [0003] The damage detection of traditional optical cables and photoelectric composite cables is mainly carried out by optical...

AI Technical Summary

Problems solved by technology

[0003] The damage detection of traditional optical cables and photoelectric composite cables is mainly carried out by optical time domain reflectometer (OTDR). This technology can only be effective when the optical fiber cable has been damaged by the infringement event and the optical fiber in the optical cable is broken, and it cannot realize the damage detection. Real-time online detection of events, and the location accuracy of breakpoints will decrease with the increase of optical cable length

Another monitoring method is to use fiber grating and other sensor devices with stress and strain sensitive characteristics to detect the safety of the optical cable. This method must add fiber grating devices to the optical cable, thus destroying the transmission characteristics of the optical cable itself. Therefore, these methods are Online application cannot be realized on existing communication optical cables or photoelectric composite cables

[0004] The existing traditional online monitoring system for optical cables is to alarm after the incident. At this time, the damage caused by the incident has already been formed, and the role of the emergency mechanism can only be the recovery of communication; if data theft occurs, there is currently no technical ability to , or even call the police afterwards

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