Precise positioning method and system of fault points of cable

Abstract

The invention discloses a precise positioning method and system of fault points of a cable. The method comprises steps of firstly, acquiring disturbance backward scattering curve data of fibers in a to-be-measured cable in case of disturbance, and disturbance-free backward scattering curve data of the fibers in the to-be-measured cable in case of no disturbance; carrying out filtering processing on the disturbance backward scattering curve data and the disturbance-free backward scattering curve data by use of a wavelet de-noising algorithm; carrying out wavelet decomposition de-noising on the disturbance backward scattering curve data subjected to the filtering processing and the disturbance-free backward scattering curve data subjected to the filtering processing; and carrying out characteristic analysis on the data obtained through the wavelet decomposition de-noising and determining disturbance positions through the characteristic analysis. According to the invention, by carrying out wavelet filtering processing on disturbance signals by use of characteristic quantity of disturbance-free noise, signal characteristics can be successfully kept after the de-noising; and by extracting the signal characteristics by use of wavelet decomposition, and determining the disturbance positions through the signal characteristics, positions of the cable fault points can be rapidly and precisely positioned.

Description

technical field [0001] The invention relates to the technical field of optical cable fault detection, in particular to a method and system for precisely locating an optical cable fault point. Background technique [0002] With the implementation of the "Broadband China" strategy, optical fiber communication has gradually become popular, and optical fiber cables have spread throughout every city in our country. However, most of the optical cables are laid underground or in the air, so the maintenance and management of massive optical cables has become a difficult problem. Especially when fiber optic cables fail due to aging, natural damage or man-made damage, it will seriously interfere with the effective operation of the information society and affect information security. Then it is very important to quickly check and locate the fault point, and to repair and restore the faulty optical cable in the shortest time. [0003] At present, OTDR is usually used to locate the fau...

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Problems solved by technology

[0004] Aiming at the problem of low efficiency and large errors in the existing methods for finding the fault point of the optical cable, the present invention provides a method and system for accurately locating the disturbance position in the process of locating the fault point of the optical cable, so that it can efficiently and accurately find the fault point of the optical cable. The disturbed position of the optical cable, so as to quickly and accurately locate the fault point of the optical cable

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