【摘要】 在电磁测深问题中,联合时频分析方法同时给出瞬变电磁信号随时间和频率的变化特性,比传统的傅立叶分析方法能更全面、更清晰地对信号加以分析。利用短时傅立叶交换、Gabor展开、Wigner-Ville展开、伪Wigner-Ville展开、平滑的伪Wigner-Ville展开等五种联合时频分析方法对作为电磁测深问题基本煤质的有耗两层媒质表面的瞬态响应电磁信号进行了分析。对上述五种联合时频分析方法的分析结果进行了比较,从而为利用瞬变电磁信号解决地质构造测深问题的数据处理提供了一条有效的新途径。更多还原

【Abstract】 Joint Time-Frequency Analysis(JTFA) methods are far more useful to characterize the transient electromagnetic signal in time and frequency domain simultaneously. JTFA methods are better than the traditional Fourier Transform Analysis method in the problem of geologic sounding. Five JTFA methods, Short Time Fourier Transform, Gabor Expansion, Winger-Ville Distribution, Pseudo Wigner-Ville Distribution and Smoothed Pseudo Wigner-Ville Distribution, have been applied to analysis of the transient electromagnetic response signal in two-layer lossy medium in this paper. By comparing the results, JTFA methods are proved to be very powerful and effective methods in processing the signal in problems of Geologic Sounding.更多还原