摘要
本文以垂直磁偶极子发射，接地导线测量这样一种发—收装置为例，讨论了求解时间域电磁场问题的计算方法。具体思路是：用线性滤波法，先求解频率域问题，然后用Ｇａｖｅｒ－Ｓｔｅｈｆｅｓｔ逆拉氏变换法将频率测深正演问题转化为相对应的瞬变测深（时间域）正演问题，得到了垂直磁偶极子场中，水平层状介质表面瞬变电磁场分量的近似表达式，由此计算了视电阻率曲线，并从理论上探讨了瞬变测深视电阻率曲线的垂向分辩能力。本文试图对中深部地球物理勘探提供一种可行的测深方法。
This paper describes the calculation method of electromagnetic field of time domain, taking the transmitter-receiver of vertical magnetic dipole and earthing conductor sounding as an example The linear filtering method is used in this paper to calculate the frequency domain, and then the normal deduction of the frequency sounding is converted to the corresponding transient sounding (time domain) by inverse Laplace transition method Consequently, the approximately calculatin of horizontal layered medium surface transient of electromagnetic field in vertical magnetic dipole field is worked out On this basis the apparent resistivity curve is calculated, and description of vertical resolution of the cruve is also given in theory Attempt of providing a sounding method is made for geophysics exploratin in intermediate and deep areas
