Simulation Research Of High Frequency Electromagnetic Scatterin And Near-field Beam Propagation Based On Ray Tracing Technology

The simulation technology of electromagnetic scattering and radiation of electrically large targets has always been a key research direction in the field of electromagnetic computing.Among them,it is expected to quickly and accurately calculate the radar cross section(RCS)of electrically large targets,and to complete the analysis of the scattering characteristics based on this.Considering the large electrical size and surfel number of the target,as well as the multiple reflection effect of electromagnetic waves between the target structures,this paper adopts the Shooting and Bouncing Ray(SBR)method combined with the Physical Optics(PO)method.That is,the technical route of the SBR-PO method.At the same time,in the near-field beam propagation problem of electrically large-sized reflector antennas,such as in the design and analysis of quasi-optical beam waveguides and sub-millimeter wave constriction fields,the algorithm needs to have both the analytical ability of near-field electromagnetic propagation and the ability to deal with large-scale electromagnetic propagation.Therefore,ray tracing technology is also an important means when dealing with specular reflections.This paper focuses on the use of Nvidia’s ray tracing tool OptiX to build and improve the above high-frequency electromagnetic algorithms,greatly improving the execution efficiency of the ray tracing link in the analysis link.The main contents of this paper are as follows:(1)The isophase surface is generated according to the target model,and the initial ray cluster is generated on this basis,and OptiX is used to ray tracing the target and make occlusion judgment.According to the calculation results of ray tracing,the surface current of the target model is calculated,and then the surface current is PO-integrated to calculate the scattered field,and then the RCS of the target model is calculated.The correctness of the algorithm is verified by comparing and analyzing several model examples calculated by the SBR-PO method with the calculation results of the FEKO.For the PO algorithm,this paper uses the Gordon integral formula to replace the original integral formula for integral calculation,and finally uses several groups of different models to verify the correctness of the algorithm.(2)The OptiX technology is introduced into the PVVA(Poynting Vector between Virtual Apertures)algorithm based on aperture integration and ray tracing,which improves the execution of the ray tracing process while ensuring the accuracy of the algorithm,thereby improving its performance in the beam.Computational power in design analysis of waveguide systems and high frequency constriction fields.