用傅氏变换实现三维MT数据的插值

Using discrete Fourier transform for interpolation of 3-D MT data.

MT法的迅速发展使得三维 MT数据处理日趋重要。三维插值也是后续三维处理解释中的重要一环。本文应用傅氏变换进行三维 MT数据内插 ,首先将原始数据处理成一系列周期性数据 ,然后通过傅氏变换、插值 ,再将插值后的数据经反傅氏变换 ,即得到插值后的数据。插值后的数据长度是原数据的两倍。三维插值分别沿 x、y和深度方向进行。通过对比分析认为 ,三维插值充分利用了空间信息 ,对于信息加强和去噪有一定作用 ,实际应用表明 ,此方法是一种有发展远景的方法。

The rapid development of Magnetotellurics (MT) made the processing of 3-D MT data become an importance day by day,3-D interpolation is also an important lin k in latter 3-D processing and interpretation.The paper applied discrete Fourie r transform to interpolation of 3-D MT data.First,processing the raw data int o a column of periodic data;then,FT,interpolation and inverse FT of the data,res ulted in interpolated data.The length of interpolated data is two times of that of raw data,3-D interpolation of data is carried out along x,y and depth direction.It is showed by analysis that 3-D interpolation fully used spatial information and has certain effects on information-enhancing and noise -elimination.The real application showed the method is prospective method.