UTD-based High-order Ray Tracing And RCS Simulation

In recent years,with the continuous emergence of various calculation methods in computational electromagnetics,computational electromagnetics has been widely used in solving electromagnetic scattering problems of complex electromagnetic environments.At present,in practical engineering applications,the analysis of the electromagnetic scattering problem of the large electric size target generally uses high-frequency approximation algorithms such as Geometric Optics(GO),the Geometrical Theory of Diffraction(GTD),and the Uniform geometric Theory of Diffraction(UTD).Since the use of numerical algorithms for electromagnetic simulation calculations of the large electric size target and complex electromagnetic environments generally requires more computing resources and higher simulation costs,the existence of these problems courses high cost to the simulation calculation of some projects.The high-frequency approximation algorithm developed by the geometrical theory of diffraction has a high efficiency in dealing with the above problems.Compared with the low-frequency algorithm,the uniform geometric theory of diffraction requires less computational resources and low computational cost when participating in simulation calculations.The uniform geometric theory of diffraction is a kind of high-frequency approximation algorithm developed from geometric optics.It is different from the geometric optical method which has failure problems in the shadow region.It is also different from the geometric diffraction theory which has failure problems in the Transition area of the bright and the shadow regions.It is a more mature and more complete high-frequency approximation algorithm.At the same time,compared with numerical calculation methods such as the moment method and the fast multipole method,UTD has a clear physical concept and its geometric optical calculation formula is easy to understand,which makes it popular in calculating the ideal conductor medium of large electric size target.However,in current practical engineering applications,there are still some problems in calculating the radar cross section of some aircraft,ships and missiles by UTD.This paper mainly studies the application of the calculation of radar cross section by UTD.At the same time,in the electromagnetic simulation experiment of urban environment by UTD,because of the complicity of urban environment,the second-order ray can not meet the simulation requirements of the urban electromagnetic environment,which makes the third-order ray tracing become necessary for further research.Therefore,this paper first introduces the third-order ray tracing,the most basic tracing work in UTD,and then studies the electromagnetic scattering problem of ideal conductor based on UTD.The UTD algorithm is programmed by FORTEAN,and is used to calculate the radar cross section of several target structures.Combined with large scale simulation software for data simulation and comparison,the correctness of the UTD solution for the ideal conductor scattering field is verified.