Design Of Optical Cable Fault Location System Based On Wavelet Transform

This paper discusses the design and implementation of the optical cable fault location system software. The system using wavelet transform technology to achieve the highway cable Qiangai alarm engineering cable fault fast, stable and reliable fault location, is a combination of laser source, OTDR, optical power meter, etc. a variety of devices by improved modulus maximum wavelet denoising method of cable fault point for accurate positioning of the portable application software.In this paper,At first, the paper introduces the optical cable line Qiangai engineering background, fiber optic cable engineering Qiangai quality inspection and evaluation group activity and optical time domain reflectometer based knowledge, discussed the cable fault point to determine the main device of optical time domain reflectometer test typical interface, curve and fault waveform curve types, with quality inspection and evaluation group activities and practice of the cable fault point curve makes a brief analysis.Then introduces the cable fault point dynamic analysis and monitoring to determine the signal analysis technology based, including with the cable fault location algorithm of least square method in the linear regression, least squares identification, wavelet transform algorithm of wavelet denoising and wavelet transform modulus greatly value denoising algorithm. An improved modulus maximum wavelet denoising method is proposed, and the algorithm is simulated by Matlab software, which verifies the effectiveness of the algorithm.And then introduce the characteristics of the detection method of cable fault signal event, according to the cable fault location demand combined with optical fiber cable for Expressway Qiangai engineering characteristics is the system in the event of singular point determination process, analysis of the cable fault signal feature extraction algorithm, the broken fiber obstacle localization algorithm, attenuation increases fault location algorithm and the MATLAB simulation, for the next write software system has laid a solid foundation. According to the design of fault location system, the common fault phenomena and the reasons are summed up, and the logical sequence of the software algorithm is determined.Then introduced the composition and structure of software system of cable fault location, according to the software structure of the framework design of cable fault location system. Using VB6.0 as the main programming tools to write the cable fault location system software interface, including the main interface design, interface design of VB and MATLAB, the design of configuration management, system management and design, positioning calculation design, design safety management, fault management design and perfor-mance management design, and gives the code examples and the interception of the part of the application program interface. Finally, the software test and result analysis of the optical cable fault location system are carried out.