A Matrix Extraction Method for Quickly Obtaining Electromagnetic Scattering Properties of Metal Rotationally Symmetrical Objects

Abstract

The invention discloses a matrix extraction method for rapidly acquiring electromagnetic scattering characteristics of metal bodies of revolution. The matrix extraction method comprises the steps of building generatrices of the metal bodies of revolution, and scattering the generatrices according to one-tenth medium wavelength; grouping subdivision line segments by using a binary tree structure, and determining near-field and far-field groups; expanding unknown scattering currents by rotational symmetry basis functions in the form of Fourier series and determining a total pattern number; building combined field integral equations for boundaries of the metal bodies of rotation, and obtaining a mode impedance matrix element calculation formula by scattering the combined field integral equations through a moment method; dividing mode impedance matrixes into near-field mode impedance matrixes and far-field mode impedance matrixes according to index relations between near-fields and far-fields; obtaining currents of surfaces of the metal bodies of rotation by accumulating obtained current coefficients of all modes, and obtaining a radar scattering sectional area by calculation through the reciprocal theorem. According to the matrix extraction method, memory consumption is low, and matrix filling and equation solving are quick.

Description

technical field [0001] The invention relates to the technical field of electromagnetic applications, in particular to a matrix extraction method for quickly obtaining the electromagnetic scattering characteristics of a metal rotationally symmetrical body. Background technique [0002] A metal rotationally symmetric body refers to an object that can be obtained by rotating a generatrix around a fixed axis. As an important class of radar targets, such as missile body and radome, people have done quite a lot of research on their electromagnetic scattering characteristics. Especially in tracking and identifying space targets, the electromagnetic scattering simulation of rotating bodies plays an important role. It has always been an important subject in the research of electromagnetic scattering to simulate and study the electromagnetic scattering of various rotating bodies by using the rotationally symmetric moment method. [0003] Andreasen, M.G first proposed the rotationall...

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Problems solved by technology

[0007] (1) The FTT method accelerates the calculation of metal rotationally symmetric bodies, but consumes a lot of memory. The scale of the simulated metal rotationally symmetric bodies is limited, and it is only very effective for some structures;

[0008] (2) Deriving closed mode Green's function to accelerate the calculation of metal rotationally symmetric bodies, the operation is cumbersome and there are many restrictions;

[0009] (3) For the fast calculation of the scattered field of an electrically large rotationally symmetric target at oblique incidence, the filling efficiency of the high-order mode matrix is ​​low

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