分层地电模型的正演递推关系

Forward recursion relation for layered geoelectric model

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。

We have deduced the upward forward iteration relation for a layered geoelectricsystem by analysing the propagation path of the electromagnetic waves in layeredgeoelectric model. The research on the characteristics of system function leads t0the following conclusions:. that the impulse response of layered geoelectric structure to vertically inci-dent electrornagnetic waves shows low pass property.. that the shallow propagation path conceals seriously the deep reflecti0ns inlow frequency band.. that the layering parameter inversion with the use of impulse response hasill-posed characteristic too.