OPGW lightning strike site polarization state waveform signal processing method
A technology of waveform signal and processing method, applied in the field of polarization state waveform signal processing at OPGW lightning strike, can solve the problems of inaccurate fault location and poor accuracy, and achieve the effect of comprehensive, accurate and high-precision fault location and diagnosis
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[0030] A method for processing polarization state waveform signals at an OPGW lightning strike, comprising:
[0031] (1) Use the polarization demodulation equipment to collect the optical polarization signal at the lightning strike of the OPGW, as shown in Figure (1), and use the wavelet noise reduction method to denoise the sampled signal. The high-speed data acquisition card collects the polarization state signal s(t) of the transmitted light inside the OPGW, and stores it in the computer for subsequent data processing, and then uses a suitable wavelet denoising method to denoise the collected polarization state signal s(t) , to obtain the polarization state signal x(t) after wavelet denoising, as shown in Figure (2).
[0032] (2) Carry out EMD (empirical mode decomposition) on the signal x(t): find out all the local maxima in the signal x(t) and use the cubic spline interpolation function to connect them into an upper envelope; The bar interpolation function connects all l...
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