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Iterative Fourier algorithm-based method for designing broadband random surface

An iterative Fourier and random surface technology, applied in design optimization/simulation, calculation, special data processing applications, etc., to achieve easy conformal, simple structure, and reduce RCS effects

Active Publication Date: 2017-07-07
SOUTHEAST UNIV
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 1965, Cooley-Tukey proposed the Fast Fourier Transform (FFT) algorithm, which greatly improved the calculation speed of Fourier Transform, and has been widely and successfully applied in many scientific fields; Applications of Algorithms for Designing Broadband Random Surfaces

Method used

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  • Iterative Fourier algorithm-based method for designing broadband random surface
  • Iterative Fourier algorithm-based method for designing broadband random surface
  • Iterative Fourier algorithm-based method for designing broadband random surface

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Embodiment Construction

[0032] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.

[0033] The broadband random surface includes a dielectric substrate, a unit array composed of multiple basic units covering the upper surface of the dielectric substrate, and a metal base covering the lower surface of the dielectric substrate; obtained by designing the structural size and spatial arrangement of each basic unit Broadband random surfaces with different electromagnetic properties; among them, the metal base plate is used to prevent electromagnetic wave transmission; the basic unit, the dielectric substrate and the metal base plate together form a single-layer radar cross-section reduction surface.

[0034] The invention is based on the principle that the calculation of the direction diagram has a certain connection with the FFT, realizes the non-directional scattering of electromagnetic waves through the iterative Fourier algorith...

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Abstract

The invention discloses an iterative Fourier algorithm-based method for designing a broadband random surface. The method comprises the steps of firstly performing reduction on an initial array factor directional diagram by adopting an iterative Fourier algorithm to obtain an ideal array factor directional diagram meeting the design requirement; and secondly based on the condition that units and the directional diagram have Fourier relationships, performing inverse Fourier transform on the ideal array factor directional diagram to obtain unit array phase information of the broadband random surface, determining the size of each basic unit in a unit array according to the phase information, and obtaining unit array layout of the broadband random surface meeting the design requirement. According to the method, the required random surface is forwards designed based on the iterative Fourier algorithm, so that long-time optimization is avoided, the finally obtained array layout can be ensured to effectively reduce the RCS (Radar Cross Section) of the random surface indeed, and the stealth performance can be greatly ensured; and the stealth frequency band of the random surface is relatively wide.

Description

technical field [0001] The invention relates to a design method of a broadband random surface, in particular to a method for designing a broadband random surface based on an iterative Fourier algorithm, and belongs to the field of radar stealth and new artificial electromagnetic materials. Background technique [0002] The method of radar stealth is to use various means to reduce the radar cross section (Radar CrossSection, hereinafter referred to as "RCS") of the target, and it is required to reduce the backscatter as much as possible, that is, to disperse the energy to all directions. There are three traditional methods to reduce the radar cross-section, namely: shape design, use of radar absorbing material (RadarAbsorbing Material), active cancellation, passive cancellation and so on. [0003] New artificial electromagnetic material refers to an artificial composite structure or composite medium with extraordinary physical properties that natural media do not have. The pu...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 程强王丹赵捷崔铁军
Owner SOUTHEAST UNIV
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