MT信号处理中小波分析与Hilbert-Huang变换的比较

摘要

Measured magnetotelluric signal is taken as the analysis object, and comparative study of wavelet analysis and Hilbert-Huang transform is applied in magnetotelluric (MT) signal procession from signal decomposition to time-frequency analysis. The mathematical theory of Wavelet analysis and Hilbert-Huang transform are expressed. The decomposition method of two ways and their physical significance for MT signal are analyzed, and the similarities and differences to characterize the spectrum of MT signal are discussed between the two methods. These provide a valuable reference foe the choice of analysis method of magnetotelluric signal procession.%以实测大地电磁信号为分析对象,对比研究了小波分析和 Hilbert-Huang 变换在大地电磁(magneto-telluric, MT)信号分解和时频分析上面的特点。给出了小波分析和Hilbert-Huang变换的数学原理,分析了2种方法在MT信号分解中的分解方法及其物理意义,讨论了2种方法在MT信号时频谱表征能力上的异同,为大地电磁信号分析方法的选择提供用了有价值的参考。