OPGW lightning strike site polarization state waveform signal processing method

Abstract

The invention discloses an OPGW lightning strike site polarization state waveform signal processing method. According to the method, a polarization demodulation device is adopted to acquire OPGW lightning strike site polarization state signals, and a wavelet denoising method is adopted to perform denoising preprocessing on sampling signals, so that wavelet denoised polarization state signals x(t)can be obtained; EMD decomposition is performed on the signals x(t), an equation described in the descriptions in the invention is obtained, rn in the equation is called a residual function, and ci inthe equation is the i-th component of the signals x(t) that satisfies an IMF condition; HHT (Hilbert-Huang) transformation is performed on each intrinsic mode function ci(t) of the polarization statesignals, and then analytical signals are constructed, and a lightning strike point can be accurately located on the basis of optical polarization state signals extracted by the final Hilbert-Huang transformation; and therefore, the problem of low accuracy of the analysis and processing of optical polarization state signals in an OPGW in the prior art can be solved, and the problem of inaccurate fault location caused by the low accuracy, and other problems can be also solved.

Description

technical field [0001] The invention belongs to waveform signal processing technology, in particular to a polarization state waveform signal processing method at an OPGW lightning strike. Background technique [0002] Since the Hilbert-Huang transform method was proposed in 1998, it has attracted people's attention as a new time-frequency analysis method. It can perform adaptive time-frequency decomposition according to the local time-varying characteristics of the signal, eliminate artificial factors, overcome the defects of using meaningless harmonic components to represent non-stationary and nonlinear signals in traditional methods, and obtain extremely high Excellent time-frequency resolution, good time-frequency aggregation and adaptability, very suitable for analysis of non-stationary signals, to a large extent make up for the shortcomings of traditional time-frequency analysis methods, making it better than traditional The analysis method is more superior, so it has ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a method for processing the polarization state waveform signal at the lightning strike of the OPGW to solve the problem of poor accuracy in the analysis and processing of the optical polarization state signal in the optical fiber in the OPGW in the prior art; resulting in inaccurate fault location, etc. question

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