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Stealth metasurface radar scattering cross section reduction method based on spatial mapping

A technology of radar cross section and space mapping, applied in instruments, calculations, combustion engines, etc., can solve a lot of time and resource problems, and achieve the effect of reducing optimization time, saving accuracy, and improving optimization efficiency

Active Publication Date: 2019-09-24
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, the research work on the scattering characteristics of stealth metasurfaces mostly relied on numerical algorithms or commercial software based on numerical algorithms, which required a lot of time and resources

Method used

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  • Stealth metasurface radar scattering cross section reduction method based on spatial mapping
  • Stealth metasurface radar scattering cross section reduction method based on spatial mapping
  • Stealth metasurface radar scattering cross section reduction method based on spatial mapping

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Embodiment 1

[0056] combine figure 1 , the present invention is a stealth metasurface radar cross section (RCS) reduction method based on space mapping (Space Mapping, hereinafter referred to as 'SM'), the specific steps are:

[0057] Step 1. In this embodiment, two kinds of Pec microstrip patch units are designed to form a stealth metasurface. The medium of the unit is a cubic medium, and the dimensions are: length 50mm, width 50mm, height 10mm, and medium ratio 2.2. The bottom of the two units is the Pec bottom surface, and the top is a square Pec patch with side lengths of 20mm and 40mm, respectively, named "0" unit and "1" unit. A stealth metasurface composed of M×N element Pec microstrip patch units is established, and M rows and N columns are closely arranged. Taking the center of the (1,1)th Pec microstrip patch unit as the coordinate origin, taking the metasurface unit in the first row as the x-axis, the metasurface unit in the first column as the -y axis, and taking the upward di...

Embodiment 2

[0102] In order to verify the correctness and effectiveness of the method in this paper, the following analysis of the stealth metasurface consists of figure 1 The two units are randomly arranged to form Figure 4 The 12×12-element planar array of , namely M=12, N=12, the incident wave is selected as the vertical irradiation of the 3GHz plane wave. The calculation example is implemented on a personal computer with a main frequency of 2.83GHz and a memory of 8GB.

[0103] Figure 5 Represents the metasurface array optimized by the algorithm of the present invention. Depend on Image 6 It can be seen from the optimization results that when Phi is 0°, most of the calculated values ​​of single-station RCS in the angular domain with an incident angle of -90°≤φ≤90° can clearly see that when the fronts are of the same size, using this The metasurface composed of the two types of patch units designed by the invention is significantly smaller than the RCS of the plane whose surface...

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Abstract

The invention discloses a stealth metasurface radar scattering cross section reduction method based on spatial mapping. The stealth metasurface radar scattering cross section reduction method includes the steps: firstly, establishing a stealth metasurface model, enabling uniform plane waves to be irradiated to the stealth metasurface, and determining the total scattering field of the stealth metasurface; secondly, calculating the RCS of the stealth metasurface obtained in the first step according to an array factor considering coupling, taking the RCS as a coarse model of a stealth metasurface SM algorithm, optimizing the coarse model and finding out an optimal solution of the coarse model; and finally, obtaining prediction parameters of the fine model by using the optimal solution of the coarse model and the mapping relationship established in the step 3, judging whether the obtained response meets the optimization design requirement or not, and if not, performing iterative updating on the mapping relationship between the established coarse model parameters and the established fine model parameters until the obtained response meets the design requirement. According to the stealth metasurface radar scattering cross section reduction method, the arrangement mode of the two units forming the super surface is optimized, and under the condition that the size of the array surface of the super surface is determined, and the RCS reduction amount is increased, and meanwhile time and internal storage are saved.

Description

technical field [0001] The invention belongs to the technical field of metasurface radar scattering cross-section reduction, in particular to a space-mapping-based stealth metasurface radar scattering cross-section reduction method. Background technique [0002] In modern warfare, radar plays a pivotal role, and any military target is faced with the serious threat of "discovery and destruction". However, if the military target has a certain anti-radar stealth performance, it can increase the probability of survival on the battlefield, thereby increasing the survivability on the battlefield. The purpose of radar cross-section (RCS) reduction is to reduce the RCS of military targets through various effective technical measures. [0003] To design and optimize large-scale stealth metasurfaces, powerful computational methods of electromagnetic scattering are necessary. In the past, the research work on the scattering characteristics of stealth metasurfaces mostly relied on num...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20Y02T10/40
Inventor 陈如山唐之宣李猛猛丁大志樊振宏韩居正陶诗飞何姿
Owner NANJING UNIV OF SCI & TECH
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