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Improved CBFM (Characteristic Basis Function Method)-based method for fast solving target monostatic electromagnetic scattering characteristics

A technology of electromagnetic scattering characteristics and targets, which is applied in the field of rapid analysis of target single-station electromagnetic scattering characteristics, can solve the problems of reduced matrix storage and solution difficulties, long singular value decomposition time, and increased number of basis functions, etc., to reduce the number of generation, calculation Accuracy assurance, quantity reduction effect

Active Publication Date: 2017-09-08
ANHUI UNIV OF SCI & TECH
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Problems solved by technology

However, for the analysis of single-station RCS, the eigenbasis function method relies on a large number of incident plane wave excitations when constructing basis functions. The storage and solution of the reduced matrix also become difficult
[0004] One solution is the improved eigenbasis function method based on singular value decomposition (SVD-CBFM), which reduces the number of incident excitation waves by fully considering the coupling between subdomains, thereby reducing the number of eigenbasis functions and SVD calculation time, but this method ignores the redundant information in the excitation, and the calculation of the secondary feature basis function increases the number of basis functions

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  • Improved CBFM (Characteristic Basis Function Method)-based method for fast solving target monostatic electromagnetic scattering characteristics
  • Improved CBFM (Characteristic Basis Function Method)-based method for fast solving target monostatic electromagnetic scattering characteristics
  • Improved CBFM (Characteristic Basis Function Method)-based method for fast solving target monostatic electromagnetic scattering characteristics

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Embodiment Construction

[0019] specific implementation plan

[0020] Step 1: According to the basic principle of the method of moments (MoM), the continuous integral equation of the target surface obtained by the analysis of the basic electromagnetic field theory is discretized into a matrix equation.

[0021] ZJ=V (1)

[0022] where Z ∈ C N×N is the impedance matrix, V∈C N×N is the incident plane wave excitation, J represents the corresponding coefficient matrix, and N represents the number of unknown quantities.

[0023] Step 2: According to the principle of characteristic basis function method (CBFM), block the entire conductor target surface, assuming that the target is divided into M sub-domains, each block is solved as an independent sub-domain, and finally each sub-domain is calculated The obtained surface currents are linearly combined to obtain the current information of the entire target surface.

[0024] For each subdomain, the characteristic basis functions (CBFs) are obtained by:

...

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Abstract

The invention discloses an improved CBFM (Characteristic Basis Function Method)-based method for fast solving target monostatic electromagnetic scattering characteristics. According the method, firstly, redundant information existing in incident plane wave excitation is considered, and the redundant information content is removed by adopting an SVD (Singular Value Decomposition) algorithm; the coupling effect among sub-domains is fully considered, and a construction method of an ICBF (Improved Characteristic Basis Function) is provided; and the information of an original PCBF (Primary Characteristic Basis Function) and an SCBF (Secondary Characteristic Basis Function) is integrated in the ICBF, so that the current information on the surfaces of the sub-domains can be accurately represented. The method disclosed by the invention has the advantages that the number of incident plane waves is reduced by utilizing the SVD algorithm; the number of CBFs is further reduced through constructing the ICBF; a constructed reduced matrix is small in dimension and easy to store and solve; and therefore, the method is very suitable for analyzing the monostatic electromagnetic scattering characteristics of electrically large size targets.

Description

technical field [0001] The invention relates to a method for quickly analyzing the electromagnetic scattering characteristics of a target single station, in particular to a method based on an improved CBFM algorithm to further reduce the number of basis function generation so as to quickly analyze the electromagnetic scattering characteristics of a target single station. Background technique [0002] The Method of Moments (MoM), as an effective method for analyzing the electromagnetic scattering characteristics of targets, has been widely concerned by scholars at home and abroad once it was proposed. However, when the method of moments is used to directly solve the target single-station RCS, the complexity is O(N 3 ) As the number N of unknown quantities increases sharply, the corresponding calculation efficiency becomes low. [0003] The Characteristic Basic Function Method (CBFM) is based on the block principle, divides the target into M subdomains, and defines characteri...

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 汪强王仲根唐晓婉杨荣金苏德淳
Owner ANHUI UNIV OF SCI & TECH
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