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Calculation method of internal scattering characteristic of complicated cavity

A technology of internal scattering and calculation method, which is applied in the direction of complex mathematical operations, etc., can solve the problems that it is impossible to carry out the calculation of the characteristics of the electric large-scale cavity, increase the calculation of unknown quantities, etc., and achieve the effect of saving design and reducing unknown quantities

Inactive Publication Date: 2017-05-10
SHANGHAI RADIO EQUIP RES INST
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Problems solved by technology

The two did not explain the method of solving the internal scattering characteristics of the cavity from the simulation point of view. If the method used in the latter test is directly appli

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  • Calculation method of internal scattering characteristic of complicated cavity
  • Calculation method of internal scattering characteristic of complicated cavity
  • Calculation method of internal scattering characteristic of complicated cavity

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Embodiment Construction

[0033] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

[0034] Such as Image 6 As shown, a calculation method for the internal scattering characteristics of a complex cavity, the calculation method includes the following steps:

[0035] S1. Construct the virtual aperture surface of the cavity according to the shape of the cavity. Generally, the virtual aperture surface is required to be relatively regular and flat, which is conducive to solving the electromagnetic field distribution on it;

[0036] S2, performing radiation integration on the excitation source to obtain the electromagnetic field distribution on the virtual aperture surface;

[0037] S3, use the electromagnetic field distribution on the virtual aperture surface as the excitation source to perform electromagnetic calculations on the overall cavity, and construct a linear equation system to solve the in...

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Abstract

The invention discloses a calculation method of an internal scattering characteristic of a complicated cavity. The calculation method comprises the following steps: S1, constructing a virtual aperture plane of the cavity according to the appearance of the cavity; S2, carrying out radiation integration on an excitation source to obtain an electromagnetic field distribution of the virtual aperture plane; S3, carrying out electromagnetic calculation on the overall cavity by taking the electromagnetic field distribution on the virtual aperture plane as the excitation source, and constructing and adopting a linear equation set to calculate internal scattering of the cavity; S4, calculating the linear equation set by adopting a Krylov subspace iteration method; and S5, obtaining stable cavity inner wall current, obtaining an aperture field, and calculating a far field scattering characteristic by taking the aperture field as the excitation source. According to the calculation method disclosed by the invention, the aperture field excitation replaces a low-scattering carrier, on one hand, the unknown quantity of calculation is reduced, and the design of the low-scattering carrier is also eliminated.

Description

technical field [0001] The invention relates to a radar target characteristic simulation technology, in particular to a calculation method for the internal scattering characteristic of a complex cavity. Background technique [0002] The analysis of cavity electromagnetic scattering characteristics is an important basis for aircraft stealth design and target feature analysis technology, and has important practical significance. It has always been a hot spot in computational electromagnetics. There is a strong near-resonance phenomenon in the cavity, and the matrix obtained by the electromagnetic field integral equation often has a large condition number, and the convergence speed is very slow when solving iteratively, and the electrically large cavity is an electrically large problem. Due to the large subdivision density and many unknowns of low-frequency numerical methods, it is difficult to use these methods to solve the scattering characteristics of real-scale cavities due...

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Application Information

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IPC IPC(8): G06F17/12
CPCG06F17/12
Inventor 高伟蔡昆张元林云
Owner SHANGHAI RADIO EQUIP RES INST
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