论文部分内容阅读
文中首先对积分方程法与米林顿法进行了比较。结果表明,在近区用两种方法计算的地波衰减因子有非常一致的结果,但对远区二次相延的计算会出现稍大的差别。文中还用积分方程法计算了几种特定函数形式及三条实际的地形剖面下的地波衰减因子W_g,分析了各种地形参数引起W_g偏离光滑地面值的变化规律。文章还对等效导电率法在应用中σ_g~e偏离原路径σ_g的大小随地形变化的情况给出了一些定量结果,并分析了此种方法的适用范围。
The article first makes a comparison between integral equation method and Millington method. The results show that there are very consistent results for the ground-wave attenuation factor calculated by the two methods in the near-field, but there is a slight difference in the calculation of the second-order delay in the far-area. The integral equation method is also used to calculate several specific function forms and the groundwave attenuation factor W_g under three actual topographic sections. The variation rules of W_g deviated from the smooth ground values caused by various topographic parameters are analyzed. The article also gives some quantitative results about the variation of σ_g ~ e from the original path σ_g with the change of terrain in the equivalent conductivity method. The applicable range of this method is also analyzed.