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Numerical method of satellite electromagnetic scattering characteristics within millimeter wave band

A technology of electromagnetic scattering characteristics and numerical methods, applied in the direction of electromagnetic field characteristics, can solve problems such as very time-consuming calculations

Active Publication Date: 2013-08-07
NANJING UNIV OF SCI & TECH
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Problems solved by technology

The transfer matrix between two far-field groups is composed of spherical Hankel function and Legendre series. The transfer factor is defined on the unit sphere with a large number of angular spectrum components. Even if the interpolation and deinterpolation methods are used, the entire transfer process The calculation is also very time-consuming

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  • Numerical method of satellite electromagnetic scattering characteristics within millimeter wave band
  • Numerical method of satellite electromagnetic scattering characteristics within millimeter wave band
  • Numerical method of satellite electromagnetic scattering characteristics within millimeter wave band

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Embodiment Construction

[0077] The numerical method of satellite electromagnetic scattering characteristic in the millimeter wave band of the present invention, the steps are as follows:

[0078] The first step is the establishment of the electromagnetic scattering integral equation, which is based on the electric field boundary condition of an ideal conductor. The tangential component of the total field on the metal surface is 0, and the total field is the sum of the incident electric field and the scattered electric field. The incident electric field is a known excitation, a uniform plane wave is usually used as the incident electric field, and the scattered electric field can be represented by the unknown surface current to be obtained.

[0079] The second step is the conversion between unknown quantities, that is, there are 5 unknown quantities in the electric field integral equation established in the first step, which are the metal surface current density, the metal surface charge density, the p...

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Abstract

The invention discloses a numerical method of satellite electromagnetic scattering characteristics within a millimeter wave band. Aiming at such a metal and medium mixed structure of a satellite, an electric field integral equation is established only for the metal part of the satellite, an equation does not need to be established for the medium part, and finally, an equation with good conditions is formed, so as to be convenient for iterative solution. Mesh generation is performed only on the metal surface of the satellite, the mesh generation does not need to be performed on the medium coated part, and the strangeness is easily processed. Because of a structural feature of the inclined long satellite, the directionality of a transfer factor component is strong, an acceleration method is adopted for a far field effect on the basis of a multi-level fast multipole algorithm, computational memory requirements are effectively reduced, and the computing time is saved.

Description

technical field [0001] The invention belongs to the rapid calculation technology of target electromagnetic scattering characteristics, in particular to the numerical method of satellite electromagnetic scattering characteristics in the millimeter wave band. Background technique [0002] Satellites are generally mainly composed of metal materials. In order to achieve the purpose of anti-corrosion, decoration and stealth, they are usually coated with dielectric materials (QJ2754-95). For the electromagnetic scattering problem of satellites, which are mixed structures coated with metal media, scholars have proposed a series of electromagnetic numerical calculation methods, among which the method of moments (MoM) based on integral equations (Ding-Feng Yu, Si-Yuan He, Hai-Tao Chen, Guo-Qiang Zhu, "Research on the electromagnetic scattering of 3D target coated with anisotropic medium using impedance boundary condition", Microwave and Optical Technology Letters, 2011, 53(2):458–462...

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Application Information

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IPC IPC(8): G01R29/08
Inventor 陈如山丁大志樊振宏陶诗飞沙侃叶晓东刘玲玲王贵盛亦军
Owner NANJING UNIV OF SCI & TECH
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