Dissertation > Astronomy,Earth Sciences > Geology > Geology, mineral prospecting and exploration > Geophysical exploration > Electrical prospecting > Method > Electromagnetic Method

Robust Estimation of Impedance Based on Energy Assembled

Author JiangLingXia
Tutor LiuJianXin;YanJiaBin
School Central South University
Course Earth Exploration and Information Technology
Keywords Magnetotelluric sounding The data processing Impedance analysis Energy aggregation Robust
CLC P631.325
Type Master's thesis
Year 2009
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Magnetotelluric sounding ( MT ) method has been widely used in geological exploration and mineral exploration , one of its main purpose is to detect underground depth media power structure , the whole process , including data acquisition , data preprocessing and anti- speech explained . To the morphological characteristics of the apparent resistivity and phase response curves as the fundamental basis for analysis of earth structure and distribution of electrical impedance calculation, analysis , processing is one of the magnetotelluric method is the most fundamental and important sounding the work noise may cause distortion of the impedance , interfere with the interpretation of the results of reliability . Effective to suppress or eliminate the effect of noise , stable impedance estimate is one of the important tasks of the electromagnetic sounding data processing . Based on the analysis summed up on the basis of the research results at home and abroad to discuss and analyze the characteristics of the magnetotelluric the signal , noise impedance to estimate the impact of characteristics and noise processing method . Deep response function estimated using the least squares estimation method assumes that the noise of the signal with the Gaussian distribution , but if the actual observed data deviate from this distribution , the method of least squares estimates of parameters in the traditional electromagnetic measurement produces a larger deviation . In view of this situation , this paper discusses the principle of the method estimated based the energy gathered Robust impedance , program implementation , and discuss the degree of aggregation of weight coefficient selection method used by the analog data calculus , prove that this method can suppress noise . The time series data of the the magnetotelluric original signal , is the basis of the post - data processing , write EH4 time series reading program , and the departure from the time-series , single point of measured data were processed to discuss the different degree of aggregation rights robust impedance estimation results of the coefficient , select the appropriate weight coefficient for processing the data , compared with the conventional treatment methods , indicating that the energy aggregation - based robust method shows better robustness of the result of the calculation is more sleek and reasonable .

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