中文摘要：

通过理论分析给出了正确的蒸发波导A模型大气修正折射率廓线式。利用试验中采集的数据，分析了实测数值与A模型计算结果的差别，结果表明：A模型在不稳定层结条件下预测的波导强度偏差的均值要低于在稳定、近中性和中性层结条件下的结果，但偏差标准差却大于其他层结情况。同时，数据还显示了在不同气、海温差条件下，高度增加时实测大气修正折射率值与A模型值之间的偏差均值代数值和标准差代数值都有增加的趋势。

英文摘要：

T he theoretical analysis leads to refractivity formula of model A . T he experimental data collected in recent years are used to analyze the difference between the actual data and the result ob-tained from model A .The results show that the duct strength difference mean predicted in unstable conditions is smallest ,but the root-mean-square errors occurring in this case is the biggest .Mean-while ,the data shows that the difference mean and root-mean-square errors tend to increase with the height as far as the different conditions of stability are concerned .