处理大地电磁资料的瞬时谱方法

大地电磁资料处理方法大多数都是对一段记录做傅氏变换，构成功率谱后再求张量阻抗元素。本文通过对记录上的实信号做窄带复数滤波或窄带递归滤波和希尔伯特变换，转换成窄带复信号，再由复信号的瞬时谱求出张量阻抗元素。利用这种方法对实际资料处理的结果与常规方法处理的结果基本一致。由于采用了快速褶积实现希尔伯特变换，因而处理时间也与常规方法大体相当。

The instantaneous spectrum method for magnetotelluric data processing

Most magnetotelluric data processing methods make the Fourier transform of a segment record to get a power spectrum then to solve for tensor impedance element, After processed by narrow band complex filtering or narrow band recurrence filtering and Hilbert transformation, real signal is transformed into narrow band complex signal, whose instantaneous spectrum is then used to solve for tensor impedance element, The data processing result obtained by this method is almost the same as that obtained by conventional method. Furthermore, the processing time is nearly equal to that needed by conventional method because fast convolution is used to perform Hilbert transformation.