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High-frequency electromagnetic scattering algorithm Calculation

Author: XuCui
Tutor: ChenRuShan
School: Nanjing University of Technology and Engineering
Course: Communication and Information System
Keywords: RCS Bouncing ray method Anisotropic media Improved surface normal vector Improved physical optics Stationary phase method
CLC: TN011
Type: Master's thesis
Year: 2009
Downloads: 63
Quote: 1
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Abstract


Complex electrically large electromagnetic scattering of fast and efficient solution for radar target recognition has very important significance. High-frequency algorithm is based on fast and efficient solution in practice there is a wide range of applications , the paper discusses the high-frequency electromagnetic scattering algorithm for calculation of complex applications . The first is the physical optics method is applied to electrically large electromagnetic scattering calculations , while the physical optics method is improved . Traditional physical optics method in calculating the electromagnetic scattering properties of the target body there is a certain degree of error , especially smaller target electric case of errors. Compared with traditional methods , improved physical superiority lies in its optical methods without introducing edge diffraction, but by the surface normal vector is decomposed into two components of the incident and reflected thereby changing the surface of the equivalent currents , improve the calculation accuracy. This paper uses an improved method of calculating certain physical optics RCS target body (RCS), verify the validity of the method . The results show that the improved physical optics method to calculate the geometric accuracy of the calculation accuracy of diffraction . Second is to use bouncing ray method to calculate the anisotropic medium target body electromagnetic scattering . By analyzing the hierarchical uniform plane wave in anisotropic media solutions to determine the medium inside the eigen vectors of the two independent components , determined to overcome the usual case, the wave vector of the difficulties in solving the coupling matrix of the eigenvalues ??and the eigenvectors are given half-space anisotropic reflection and transmission coefficients of the analytical solution . The generalized anisotropic medium propagation matrix obtained analytical expressions are obtained in the usual sense of the reflection coefficient in anisotropic layered media and anisotropic coated metal surface reflection coefficient . The above results combined with bouncing ray method can be applied to the target body anisotropic materials RCS. The results show that the anisotropic coating material can significantly reduce the target body RCS. Concludes with a discussion on the quadrilateral surface physical optics integral stationary phase method to solve the given target surface quadrilateral perfect conductor stationary phase formula ; numerical example , obtained stationary phase method has an advantage in speed conclusions.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > General issues > Basic theory > Radio wave propagation,the propagation mechanism
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