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给出一种基于ＦＥ－ＴＤ方法和Ｄｕｆｏｒｔ－Ｆｒａｎｋｌｅ有限差分方法的混合数值算法，以计算不均匀导电大地层中的瞬态电磁场。该法提供了一种用于模拟具有任意时间波形的电磁脉冲在大地深层的传播的方法，且所需ＣＰＵ时问比ＦＤ－ＴＤ法少得多。通过与ＦＤ－ＴＤ法比较，证明了该方法的可靠性。
A hybrid numerical algorithm based on the FE-TD method and the Dufort-Frankle finite difference method is given to calculate the transient electromagnetic field in an inhomogeneous conductive stratum. This method provides a method for simulating the propagation of electromagnetic pulses with arbitrary time waveforms in the deep earth and requires much less CPU time than the FD-TD method. By comparing with FD-TD method, the reliability of this method is proved.