针对大尺度不规则地形条件下电波传播特性预测的准确性与时效性问题, 在非均匀网格技术的基础上, 提出了抛物方程的动态网格模型, 并通过对刃峰地形条件下的电波传播特性进行仿真, 探讨了动态网格模型的可行性和有效性。结果表明: 在计算精度相似的情况下, 相对于均匀细网格和非均匀网格, 动态网格模型缩短了抛物方程的计算时间, 具有更高的时效性; 相比均匀粗网格具有更高的计算精度。可见, 抛物方程的动态网格模型在预测大尺度不规则地形条件下电波传播特性时具有高效性。

The dynamic grid model of parabolic equation is presented based on non-uniform mesh technique for the accuracy and timeliness of the radio wave propagation in large scale irregular terrain environment.The feasibility and validity of the dynamic grid model are verified by simulating the radio propagation characteristics in the complex environment including knife-edge.The results show that:In the case of similar calculation accuracy,the parabolic equation with dynamic grid model can reduce the computation time compared with the uniform fine grid and the non-uniform grid in testing; and it has higher accuracy compared with the uniform coarse grid.Therefore,the dynamic grid model can enhance the efficiency greatly in predicting the radio wave propagation.