不规则分层地层中电磁波透地传输的衰减特性

发布时间：2018-09-18 20:33

【摘要】：分层地层对透地通信电磁波的传播特性有重要影响。现有的研究主要是基于规则分层地层模型对电磁波透地传播特性进行分析,但分层地层往往是不规则的。为此,基于所建立的不规则分层地层模型,将分层地层模型分界面抽象为平面、正斜面和负斜面。根据电磁波入射角与分层地层倾斜角的几何关系,推导了电磁波在不规则分层地层中正向和反向传播时电场强度和磁场强度的衰减情况。仿真表明分层地层的不规则性与电磁波进入分层地层介质的先后次序均对电磁波的传输衰减有重要影响。虽然电场强度和磁场强度随着透地距离的增加都显著地衰减,但电场强度和磁场强度的衰减特性并不相同。此外,无论是对电场还是磁场,由于在分层地层分界面电磁波都要产生反射,因此,电磁波在进入到另外一层媒质时电场强度和磁场强度都会产生一定程度的突变衰减。
[Abstract]:Stratified strata play an important role in the transmission characteristics of electromagnetic waves in geocommunications. The existing research is mainly based on regular stratified stratigraphic model to analyze the electromagnetic wave transmission characteristics, but stratified strata are often irregular. Therefore, based on the irregular stratigraphic model, the stratigraphic model is abstracted into plane, positive slope and negative inclined plane. According to the geometric relationship between the incident angle of electromagnetic wave and the inclined angle of stratified strata, the attenuation of electric and magnetic field intensity of electromagnetic wave in the forward and back propagation of irregular stratified strata is deduced. The simulation results show that the irregularity of stratified strata and the sequence of electromagnetic waves entering the stratified media have an important effect on the transmission and attenuation of electromagnetic waves. Although the electric field intensity and the magnetic field intensity attenuate significantly with the increase of the distance through the earth, the attenuation characteristics of the electric field intensity and the magnetic field intensity are different. In addition, both the electric field and the magnetic field are reflected at the interface of stratified strata, so the electric field intensity and the magnetic field intensity of the electromagnetic wave will decay to a certain extent when they enter another layer of medium.
【作者单位】：北京交通大学电子信息工程学院;
【基金】：国家重点研发计划重点专项资助项目(2016YFC0801800) 国家自然科学基金资助项目(51474015,51274018)
【分类号】：TD655

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