地形抛物模式(TPEM)被广泛用于对流层电磁波传播损失的数值模拟,对于大气吸收衰减量计算,该模式使用固定的大气衰减率沿传播路径进行积累,这与实际的海面大气状况不符并会产生计算误差。文章针对这一不足,基于水汽密度的垂直递减关系式,引入随高度变化的大气衰减率计算关系式对TPEM进行了改进,并利用某次试验记录对改进前后TPEM的计算结果进行了对比验证,结果表明改进后的TPEM可更有效、准确地模拟电磁波传播。 The terrain parabolic model (TPEM) is widely used for the numerical simulation of tropospheric electromagnetic wave propagation loss. For atmospheric absorption attenuation calculations, this model uses a fixed atmospheric attenuation rate to accumulate along the propagation path, which is inconsistent with the actual sea surface atmospheric conditions and results Calculation error. In this paper, based on the vertical decreasing relation of water vapor density, this paper introduced the relation of the atmospheric attenuation rate changing with height to improve the TPEM, and compared the calculation results of the TPEM before and after the improvement by some test records. The results show that the improved TPEM can simulate the electromagnetic wave propagation more effectively and accurately.