The Numerical Computation Of Radar Cross Section With Finite-Volume Method In Time-Domain

With the development of the electronic and information war, the test of radar cross section (RCS) becomes an important part of "the technological confrontation of stealth and anti-stealth" . Both the study on electromagnetic scattering properties and optimization of aircraft configuration require accurate and efficient numerical simulation of electromagnetic scattering field to predicate the large range of RCS. But so far, the calculating accuracy and efficiency of the Moment Methods and all other kinds of engineering methods in solving high frequency scattering problems are not good enough not only for the testing of complicated objects, but also for designing.The finite volume in time domain (FVTD), which was pioneered and developed by Shankar from the Computational Fluid Dynamics (CFD), is a time-domain method for solving the Maxwell' s equations. Using the mature technology and experience in numerical schemes and figures display, which developed and accumulated from CFD for decades years, the FVTD technology is developing rapidly.This paper has studied the applications of FVTD technology in Computational Electromagnetism (CEM), in particular the general method for solving Maxwell' s equations starting with the numerical algorithms of radar cross-section (RCS), then apply the numerical approach to the numerical simulation of the scattering course of a perfectly electrically conducting materials in free space. The numerical simulation of the scattering of a perfect conductor in free space were taken as an example, applied the FVTD in RCS computation. According to the requirements of the circular cylinder and sphere, the two-dimensional and three-dimensional software were developed. Through the comparative analysis of the computed RCS with the theoretical value for the different scattering conditions, results show, the calculation results have very good agreement with the theoretical value.