地下水平电偶极子在均匀球形地面产生的侧面波

Lateral wave induced by a subterranean horizontal electric dipole on the global surface of the earth

讨论了位于地下的水平电偶极子在均匀球形地面上产生的侧面波 (Lateralwave)。从位于球形地面场的垂直电偶极子和磁偶极子在地面上建立的电磁场出发 ,利用互易定理 ,获得了地下水平电偶极子在地面上和地面下产生的既方便于数值计算又具有足够精度的电磁场的解析表达式。计算结果表明 ,由于地球曲率的影响 ,沿球形地面传播的侧面波比沿平行地面传播的侧面波衰减的快 ,当收发地点的距离超过 4 0km后 ,地球曲率对传播的影响就不能被忽视 。

The analysis expressions of the lateral wave on the surface of the global earth induced by a subterranean horizontal electric dipole have been obtained. These expressions are enough accurate and can be easily used to computing. These expressions are obtained by the reciprocity theorem base on the electromagnetic field induced by a overground vertical electric and magnetic dipole. In the paper, the computing result is given according to these expressions, and it show that the lateral wave attenuates faster along the global surface than along the plane surface. The influence of the global curvature can be not ignored when the distance between the transmitted place and the received place is more than 40 km. This paper can provide more aid for the subterranean communication and the submarine communication.