大地電磁時序資料處理方法及其系統

專利類型

發明

專利國別 (專利申請國家)

中華民國

專利申請案號

107127869

專利證號

I 684781

專利獲證名稱

大地電磁時序資料處理方法及其系統

專利所屬機關 (申請機關)

國立中央大學

獲證日期

2020/02/11

技術說明

本發明提供一種大地電磁時序資料處理方法，資料切割步驟將電磁場時間序列資料集切割成電磁場時間序列資料組。時域轉頻域步驟依據轉換函數轉換各電磁場時間序列資料組而產生電磁場頻域資料組。頻譜估計步驟依據核密度估計法估計各電磁場頻域資料組而產生特定分析頻率點之複數頻譜。阻抗計算步驟依據最小二乘法計算複數頻譜而求得複數阻抗。異常剔除步驟依據最大似然法則剔除複數阻抗中具有異常相位者。正規化統計步驟依據正規化統計估計複數阻抗中具有正常相位者而產生大地電磁阻抗數值。藉此，透過異常剔除及正規化統計，能提升可靠度。 A magnetotelluric data processing method and a system of the magnetotelluric data processing method are proposed. The magnetotelluric data processing method provides a data separating step, a frequency transforming step, a spectrum estimating step, an impedance calculating step, an anomaly removing step and a robust estimating step. The data separating step is for separating a magnetotelluric data set into a plurality of magnetotelluric data groups. The frequency transforming step is for transforming each of the magnetotelluric data groups into a magnetotelluric frequency-domain data group according to a fast Fourier transform. The spectrum estimating step is for estimating each of the magnetotelluric frequency-domain data groups to generate a complex frequency spectrum with a specific frequency according to a Parzen window. The impedance calculating step is for calculating the complex frequency spectrums to generate a plurality of complex impedances according to a generalized least squares method. The anomaly removing step is for removing the complex impedances with anomalous phases according to a Maximum Likelihood Estimation. The robust estimating step is for estimating the complex impedances with normal phases to generate a magnetotelluric impedance value according to a Robust Estimation. Therefore, the magnetotelluric data processing method of the present disclosure can improve reliability of the magnetotelluric impedance value via the anomaly removing step and the robust estimating step.

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