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控制源,频率域,或时间域电磁法均要求根据使用的震源排列精确、快速、可靠地计算电场和磁场。除了小磁偶极震源外,所有的电源和磁源均采用长直线电缆,以便于接地。如果震源与接收点相隔太远,可视复合电极为很小的电极,在1D地层模型中,电场以输入函数的Hankel变换表示,它取决于模型参数。Hankel变换可以用快速Hankel变换的数字滤波估
Controlled, frequency domain, or time domain EM methods require that the electric and magnetic fields be calculated accurately, quickly and reliably based on the source arrangement used. In addition to small magnetic dipole sources, all power and magnetic sources use long straight cables to facilitate grounding. If the source is too far away from the receiving point, the visible composite electrode is a very small electrode. In the 1D stratigraphic model, the electric field is represented by the Hankel transform of the input function, which depends on the model parameters. Hankel transforms can be estimated using digital filtering of fast Hankel transforms