In order to realize the purpose to improve the prospecting precision to the earth of transient electromagnetic method, the idea and calculate method of regarding the reflection coefficients of layered earth as feature parameter, extracting it from field equations and getting imaging section from field data are proposed. In the course of calculation, the technique of linear digital filter and linear programming are used. The imaging result from theory model shows that the method put forward in this paper can improve greatly the ability to recognize underground electric-interfaces.
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