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通过富立叶变换在频率域上研究异常,给物探重磁数据处理工作增加了新的手段.诸如,利用异常的振幅谱和对数振幅谱估算地质体的埋深,根据频谱曲线确定干扰体的频率范围,设计适宜的滤波算子,通过滤波运算压制干扰、突出有用异常等等.目前获得异常频谱的通用方法是以电子计算机对异常进行数值富立叶变换.在电算尚未充分普及的情况下,为了适应野外物探工作,本文根据积分变换近似计算方法的原理,提出一种二度重磁异常振幅谱的简易手算方法.
The study of anomalies in the frequency domain by Fourier transform has added new means to the geomagnetic data processing of geophysical data, such as the estimation of the buried depth of the geological body by using the anomalous amplitude spectrum and the logarithmic amplitude spectrum, Of the frequency range, the design of the appropriate filter operator, suppress interference by filtering operation, highlighting the useful anomalies, etc. At present, the common method of obtaining abnormal frequency spectrum is electronic Fourier transform for numerical abnormalities in the computer. In order to adapt to the geophysical prospecting in the field, this paper presents a simple hand calculation method based on the principle of integral transform approximation method.