EMT-Empirical mode decomposition based Magneto-Telluric processing: Using a non stationary method to compute instantaneous spectral data. 21

Abstract:

Non stationary electromagnetic noise affects the computation of Fourier Spectra and, along, the estimation of the magnetotelluric (MT) transfer functions (TF). We provide a TF estimation scheme based on an emerging non linear, non stationary time series analysis tool, called Empirical Mode Decomposition (EMD) in order to be better suited in the presence of non stationary effects. In contrast to previous works, we argue the necessity of a multivariate analysis, highlight the possibility to use instantaneous parameters and define the homogenization of frequency discrepancies between data channels. Our scheme uses the robust statistical estimation of transfer functions based on principal component regression and can be used with and without aid by remote reference station (s).

Año de publicación:

2012

Keywords:

Fuente:

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