沿不规则不均匀地面传播的侧面波

Lateral wave propagating along irregular and inhomogeneous ground

侧面波传播经常用于长波地下通信,目前工程应用上一般将地下收发天线所处的介质环境理想化为均匀平面与均匀球面,在这种理想化模型下,已有适合于工程应用的侧面波传播计算公式,但当收发天线处于复杂地面环境时,这些公式不适用。以沿不均匀地面传播的地波衰减因子所满足的积分方程算法以及互易定理出发,导出了适用于不规则不均匀地面传播的侧面波一般公式,并进行了数值计算。数值计算结果表明,在理想化的均匀平面和球面条件下,所得结果与已有公式完全吻合,在复杂地形条件下,计算结果具有更明确的物理意义,更好的描述了沿复杂地面条件下侧面波传播特性。

Usually, lateral wave is used in LF underground communication system. When the medium environment in which transmitter and receiver located, is idealized as homogeneous planar or spherical earth, the formulas of lateral wave propagation have been obtained. But, when the medium is inhomogeneous and irregular, these formulas can＇t be used. In this paper, based on the integral equation of ground wave attenuation factor and the reciprocity principle, a new solution of lateral wave propagation along irregular and inhomogeneous ground has been obtained. The numerical calculations shows that, when medium is homogeneous planar or spherical earth, the result of new formula coincides with the old one＇s. When the medium is irregular and inhomogeneous, the calculations of new formula express the propagation rule of lateral wave very clearly.