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《Progress In Geophysics》 2004-02
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Discussion on the non-minimum phase of magnetotelluric signals

WANG Shu-ming,WANG Jia-ying(Applied Geophysics Department, China University of Geosciences, Wuhan 430074, China)  
Traditional power spectral method can only process minimum phase signal, which is very difficulty to process non\|minimum phase signal due to the power spectrum of signal only contains magnitude information without phase one. This paper analyses practical magnetotelluric (MT) signals of different areas, and the results indicate that not all the zero\|point distributions, lying in Z plane of MT signals of different sites, locate in unit circle. Based on this result, we can judge that MT signals, in general, have the characteristic of non\|minimum phase. So it is necessary to improve traditional processing method, and develop new data processing scheme. The analysis of practical MT signals, theory and numerical model test testify that the higher\|order statistics of signals contain its phase information. Hence, higher\|order statistics method can effectively process MT signals with non\|minimum phase characteristic.
【Fund】: 国家自然科学基金资助项目(40274039)资助.
【CateGory Index】: P631.3
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