离散复镜像法在海水极低频电磁波传播计算中的应用

巨汉基; 方广有; 纪奕才; 张锋

doi:10.3724/SP.J.1146.2010.00792

离散复镜像法在海水极低频电磁波传播计算中的应用

doi: 10.3724/SP.J.1146.2010.00792

巨汉基^{* 方广有纪奕才张锋,},
方广有,
纪奕才,
张锋

基金项目:

国家863计划项目(2008AA10Z205)资助课题

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出版历程
- 收稿日期: 2010-07-28
- 修回日期: 2010-11-18
- 刊出日期: 2011-04-19

Application of DCIM on Extremely Low Frequency Electromagnetic Wave Propagation Calculation in Sea Water

Ju Han-Ji^{* 方广有纪奕才张锋
,},
Fang Guang-You,
Ji Yi-Cai,
Zhang Feng

摘要

摘要: 该文利用并矢格林函数法求解海水中水平电偶极子辐射场的矢量位和标量位格林函数。将在高频领域获得广泛应用的离散复镜像法引入海水里极低频电磁波传播计算中。高频和极低频情况下的波数公式不同导致积分路径发生变化，该文提出了一条新的适用于极低频情况的积分路径。使用广义笔函数束法将被积函数表示成指数和的形式，使用二级离散复镜像法得到空气-海水-海床3层水平分层模型的空间域闭式格林函数。基于混合位积分方程对电场进行了计算。与软件FEKO和WHAM的结果比较说明离散复镜像法在极低频电磁波传播计算中是有效的，并且在远区比WHAM能更好地体现出电场的衰减趋势。
- 电磁波传播 /
- 海水 /
- 极低频 /
- 格林函数 /
- 离散复镜像法
Abstract: The vector and scalar potentials Greens functions of the Horizontal Electric Dipole (HED) radiation in sea water are derived. The Discrete Complex Image Method (DCIM) which has been used broadly in high frequency domain is introduced into the Extremely Low Frequency (ELF) electromagnetic wave propagation calculation in sea water. The integral path does not hold valid for the ELF situation and the reason can be ascribed to the change of the wave number at different frequency. The new integral path suitable for ELF situation is proposed. The sea environment is modeled as air-sea-sediment three-layer geometry. Generalized Pencil-Of- Function (GPOF) method is used to approximate the integral kernel with exponential summation. The DCIM is employed to obtain spatial domain closed-form Green's functions for the layered model. The electric filed is expressed based on the Mixed-Potential electric field Integral Equation. The results are compared with software FEKO and WHAM. It is safe to conclude that the two-level DCIM approach in this paper is effective and can exhibit better field decay rate at a further distance than WHAM.
- Electromagnetic wave propagation /
- Sea water /
- Extremely Low Frequency (ELF) /
- Greens functions /
- Discrete Complex Image Method (DCIM)

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