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目的:为提高瞬变电磁探测精度,提出用反射系数作为特征量来对地下电性分界面成像,给出了方法的数学模型和实现步骤。并给出从实测数据中提取反射系数,对电性界面实现成像的思路。资料和方法由野外实测资料出发,在频率域内用数字滤波技术计算波阻抗,再通过域的变换在时间域内建立含有反射系数的方程组。结果最终后通过线性规划法求出反射系数,并以此值为参数来绘制成像断面。结论数值模拟结果和实例的应用结果表明方法正确、有效。方法本身提高了瞬变电磁对电性层的分辨能力。
OBJECTIVE: To improve the accuracy of transient electromagnetic detection, a reflection coefficient is taken as the feature to image the electrical interface of the subsurface. The mathematical model and the realization steps are given. The idea of extracting the reflection coefficient from the measured data and imaging the electrical interface is given. Data and methods are based on measured data in the field. In the frequency domain, the wave impedance is calculated by digital filtering technique, and then the system of reflection coefficients is established in the time domain by domain transformation. The results were finally obtained by linear programming reflection coefficient, and use this value as a parameter to draw the imaging section. Conclusions The numerical simulation results and the application of examples show that the method is correct and effective. The method itself improves the resolving power of the electro-magnetic layer by transient electromagnetic.