层状地电模型中有限长导线源电磁场的正演计算

摘要

This paper starting from the Maxwell equations,the analytical formula of length wires source is obtained.When calculating each components of electromagnetic field,the Hankel transform filter coefficient with higher calculation efficiency and accuracy is used to calculate integral term of Bessel function.Though analyzing electric dipole field and length wires source field,we find the superposition field excited by multiple electric dipoles can replace the length wires field in homogeneous half space model,but there are greatly differences in layered model.%该文从Maxwell方程出发,得到了长导线源的解析公式,计算电磁场各分量时,选用计算效率和精度较好的快速汉克尔变换滤波系数计算贝塞尔函数积分项.通过对电偶极子场和长导线源场分析,发现在均匀半空间模型中,多个电偶极子叠加场可等效代替长导线源场;而在层状模型中两者差别较大.