Local polynomial approximation and intersection of confidence intervals for removing noise of lightning electric field measurements
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| Format: | Artículo científico |
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Universidad Nacional de Colombia
2018
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| _version_ | 1876465003304845312 |
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| author | Herbert Enrique Rojas Cubides |
| author_facet | Herbert Enrique Rojas Cubides |
| contents | Local polynomial approximation and intersection of confidence intervals for removing noise of lightning electric field measurements Herbert Enrique Rojas Cubides Camilo Andrés Cortés Guerrero María Carolina Forero Mejía Ingeniería Electric field lightning flash noise reduction local polynomial approximation intersection of confidence intervals Lightning electric field (LEF) measurements are aperiodic signals characterized by inherent noise of different sources, i.e., it is not possible to register a noise-free signal. In the last decade, the denoising of LEF measurements has been achieved using some time-frequency representations such as short-time Fourier transform (STFT), wavelet transform (WT) and fractional Fourier transform (FRFT) without definitive results. In this paper, a denoising process applied on LEF measurements using the Local Polynomial Approximation (LPA) is proposed. The window size selection is made by combining the LPA with the intersection of confidence intervals (ICI) algorithm. Furthermore, a cross-validation criterion is used to select the optimal value of the threshold parameter in the LPA-ICI denoising method. It is shown that for different signal-to-noise ratio (SNR) values, the proposed method significantly reduces the noise present in the recorded signals. Finally, a discussion about the processed signatures in terms of some lightning electric field temporal features is performed. 2018 artículo científico 0012-7353 https://www.redalyc.org/articulo.oa?id=49657889034 https://www.redalyc.org/journal/496/49657889034/ https://www.redalyc.org/journal/496/49657889034/html/ https://www.redalyc.org/journal/496/49657889034/49657889034.epub https://www.redalyc.org/journal/496/49657889034/movil 10.15446/dyna.v85n205.64151 en http://www.redalyc.org/revista.oa?id=496 Dyna application/pdf Universidad Nacional de Colombia Dyna (Colombia) Num.205 Vol.85 |
| format | Artículo científico |
| id | redalyc_49657889034 |
| institution | Redalyc |
| language | en |
| publishDate | 2018 |
| publisher | Universidad Nacional de Colombia |
| spellingShingle | Local polynomial approximation and intersection of confidence intervals for removing noise of lightning electric field measurements Herbert Enrique Rojas Cubides Ingeniería Electric field lightning flash noise reduction local polynomial approximation intersection of confidence intervals Local polynomial approximation and intersection of confidence intervals for removing noise of lightning electric field measurements Herbert Enrique Rojas Cubides Camilo Andrés Cortés Guerrero María Carolina Forero Mejía Ingeniería Electric field lightning flash noise reduction local polynomial approximation intersection of confidence intervals Lightning electric field (LEF) measurements are aperiodic signals characterized by inherent noise of different sources, i.e., it is not possible to register a noise-free signal. In the last decade, the denoising of LEF measurements has been achieved using some time-frequency representations such as short-time Fourier transform (STFT), wavelet transform (WT) and fractional Fourier transform (FRFT) without definitive results. In this paper, a denoising process applied on LEF measurements using the Local Polynomial Approximation (LPA) is proposed. The window size selection is made by combining the LPA with the intersection of confidence intervals (ICI) algorithm. Furthermore, a cross-validation criterion is used to select the optimal value of the threshold parameter in the LPA-ICI denoising method. It is shown that for different signal-to-noise ratio (SNR) values, the proposed method significantly reduces the noise present in the recorded signals. Finally, a discussion about the processed signatures in terms of some lightning electric field temporal features is performed. 2018 artículo científico 0012-7353 https://www.redalyc.org/articulo.oa?id=49657889034 https://www.redalyc.org/journal/496/49657889034/ https://www.redalyc.org/journal/496/49657889034/html/ https://www.redalyc.org/journal/496/49657889034/49657889034.epub https://www.redalyc.org/journal/496/49657889034/movil 10.15446/dyna.v85n205.64151 en http://www.redalyc.org/revista.oa?id=496 Dyna application/pdf Universidad Nacional de Colombia Dyna (Colombia) Num.205 Vol.85 |
| title | Local polynomial approximation and intersection of confidence intervals for removing noise of lightning electric field measurements |
| topic | Ingeniería Electric field lightning flash noise reduction local polynomial approximation intersection of confidence intervals |
| url | https://www.redalyc.org/articulo.oa?id=49657889034 https://www.redalyc.org/journal/496/49657889034/ https://www.redalyc.org/journal/496/49657889034/html/ https://www.redalyc.org/journal/496/49657889034/49657889034.epub https://www.redalyc.org/journal/496/49657889034/movil |