通过优选建立了等效地层电导率变误差迭代搜索方法，提高了井眼环境校正的精度和稳定性。
A technique of variable-error iterative searching solution for equivalent formation conductivity is developed. The accuracy and stability of borehole correction are improved.
电离层对电磁脉冲传播的影响可以用一个频域的电流密度来描述，在时域则等效为一附加的电流密度和电导率。
Additional current density, which is a function of frequency, can be used to describe the effect of the ionosphere in the process of electromagnetic pulse propagation.
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