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通过对分层地电模型中电磁波传播的路径分析，我们导出了一种逐层向上的地电系统正演迭代关系。研究系统函数特性，可以得出：①层状地电结构对于垂直入射电磁波的脉冲响应为低通特性；②在低频端，浅层路径对于深层界面反射的掩盖是严重的；③根据脉冲响应反演分层参数存在着不适定性。
Through the analysis of the electromagnetic wave propagation in the stratified geoelectric model, we derive a forward-iteration relationship of the geoelectric system layer by layer upward. The characteristics of the system functions can be drawn as follows: ① The impulse response of the layered geoelectric structure to the vertically incident electromagnetic wave is low-pass characteristic; ② The cover of the shallow path reflection on the deep interface at the low-frequency end is serious; ③ According to the impulse response The stratum parameters have ill-posedness.