An Effective High-Frequency Method for the Near-Field Scattering From an Electrically Large Ship Illuminated by a Hertzian Dipole

This letter is dedicated to develop an effective high-frequency method for the near-field (NF) scattering from an electrically large ship illuminated by a Hertzian dipole. First, for primary illumination, a local expansion technique based on the facets of the target is introduced to account the NF scattering, which has a singularity-free characteristic. Second, for secondary rays, the ray-generation technique on the sphere grid is proposed to reduce the number of ray tubes. And the ray-tracing strategy based on one central ray is proposed to accelerate the tracing process, which benefits to the parallelism by utilizing the graphics processing unit (GPU). Therefore, it is particularly attractive since the proposed method requires very little increase in computational cost and yields a good accuracy in the NF scattering computation of an electrically large ship problem.