Study on Subgridding Model of the Parabolic Equation and Its Application

In order to rapidly and accurately solve the radio wave propagation problems in a large scale complex electromagnetic environment with key targets, a subgridding model of the Parabolic Equation (PE) method based on the non-uniform mesh technology is presented with the detailed description on how to construct specificaly this model. The high efficiency of subgridding technique is verified by computing a complex electromagnetic environment case with a strong scattering object. The results show that the subgridding technique for the parabolic equation can improve the computational speed by 4.57 times and decrease the grid number by 86.64% as compared with the fine grid. It has a higher precision in comparition with the non-uniform mesh, demonstrating that the subgridding model can significantly enhance the simulation efficiency in solving the parabolic equation.