Simulation method for electromagnetic scattering characteristic of plurality of non-coaxial rotating symmetric bodies

Abstract

The invention discloses a simulation method for electromagnetic scattering characteristic of a plurality of non-coaxial rotating symmetric bodies. The simulation method comprises the following steps of: building a model of each rotating symmetric body and a corresponding equivalent sphere; respectively building first and second local rectangular coordinate systems on each rotating symmetric body; determining the excitation vectors by using plane wave as an excitation source; respectively building scattering matrixes in the first local coordinate system of each rotating symmetric body; building a third local rectangular coordinate system for every two equivalent spheres and determining the transmission matrix between the two equivalent spheres; building rotating matrixes among the first, second and third local rectangular coordinate systems; building an equation set and obtaining equivalent electromagnetic flow on each equivalent sphere by using an iteration method; and determining the scattering field of a remote area, thus obtaining the radar scattering section area. The simulation method disclosed by the invention provides a quick and efficient solution for electromagnetic scattering simulation of a plurality of rotating symmetric bodies, saves spatial resources, and can accurately and quickly simulate the electromagnetic scattering characteristic of the plurality of non-coaxial rotating symmetric bodies.

Description

technical field [0001] The invention relates to the technical field of electromagnetic simulation, in particular to a method for simulating electromagnetic scattering characteristics of a plurality of non-coaxial rotationally symmetrical bodies. Background technique [0002] Rotational symmetry refers to a three-dimensional target that is rotationally symmetrical around an axis. It is a common radar target, such as various multi-warhead problems, missile group problems, etc., and has been widely concerned and studied. The rotationally symmetric body moment method can efficiently analyze the electromagnetic scattering of various rotationally symmetric bodies. Compared with the traditional analysis method based on RWG basis function subdivision modeling, the memory consumption and calculation time are much less. The rotationally symmetric moment method was first proposed by Andreasen, M.G in 1965 (M.Andreasen, "Scattering from bodies of revolution," Antennas and Propagation, I...

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Problems solved by technology

However, for the scattering problem of multiple rotational symmetry groups, we cannot directly establish the generatrices of all rotational symmetry bodies in a rotational symmetry group in a coordinate system and keep them coaxial, unless they share a rotational symmetry axis

Therefore, the direct use of the traditional rotationally symmetric body moment method cannot achieve dimensionality reduction for multiple non-coaxial rotationally symmetric bodies, so it cannot exert high-efficiency performance

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