以反射系数为特征量的瞬变电磁电性界面的成像(英文)

Imaging The Electrical Interface of TEM by The Feature Parameter of Reflection Coefficient

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 In order to improve the detection accuracy of TEM,it has been put forward to that the geo-electrical interface underground can be imaged by reflection coefficient. The mathematical model and process step have been provided. Materials and Methods The reflection coefficients are gotten from the data observed in field has been given as follows: Beginning with the data observed in field,calculating wave-impedance with the technical of digital filter in frequency domain, after domain transform functions that contain reflection coefficient have been constructed in time domain. Result At last reflection coefficient has been computed by linear programming。Imaging section of the parameter has been drawn. of numerical modeling and example application show that the thought is right and efficient. Conclusion The method improves the distinguishing capacity of TEM to geo-electrical layer.