High Order Electromagnetic Modeling for High Frequency

摘要

The goals of this project were to insert mature physical theory of diffraction (PTD) based phenomenology models into the Xpatch computational electromagnetics (CEM) prediction codes and analysis tools. Several incremental length diffraction coefficient derivations were identified as candidates for inclusion. The shadow boundary incremental length diffraction coefficient (ILDC) capability was integrated based on the significant correction it applies to the physical optics current discontinuity in the neighborhood of the shadow region of smooth scatterers. The truncated wedge incremental length diffraction coefficient was implemented because it provides fully polarimetric responses for a large range of edge discontinuities and surface areas, and it avoids discontinuities and singularities associated with earlier wedge ILDC derivations. A detailed study of creeping waves was performed to supplement the shadow boundary ILDC development. All functionality developed under this project underwent comprehensive unit, integration, and regression level testing prior to delivery.