Research on Two-Way Parabolic Equation Modeling under Irregular Terrain Environment

Abstract

Based on the conventional split-step Fourier transform(SSFT),the recursive two-way parabolic equation(TWPE) modeling is presented for the problems of former algorithms' deficiencies and computational error.The traditional algorithms forecast only forward-propagating waves and neglect the backward-propagating waves,which causes greater error in the presence of irregular terrain boundary environment.The new algorithm enhances the computation accuracy and remedies the insufficiencies by the recursive two-way split-step method.Compared to traditional wide-angle parabolic equation(WAPE) and geometrical theory of diffraction(GTD),the correctness and applicability of the model are verified by simulation results in the complex environment including single knife-edge,double knife-edges and real terrain.