Air target scattering characteristic analysis method based on adaptive grid edge encryption

By combining adaptive mesh edge refinement and ray intersection method with physical optics, the problem of high computational complexity in the analysis of scattering characteristics of nearby targets is solved, realizing efficient and accurate analysis of scattering characteristics of nearby targets, applicable to the calculation of scattering fields of concave and convex targets and various radar bands.

CN121114951APending Publication Date: 2025-12-12FUDAN UNIVERSITY
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Patent Information

Application Number
CN202410754922.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-06-12
Publication Date
2025-12-12

AI Technical Summary

Technical Problem

Existing technologies have high computational complexity in analyzing the scattering characteristics of nearby targets. Traditional methods take too long to compute and have insufficient memory when computing resources are limited. Furthermore, traditional boundary tracing methods can only find the correct shadow boundaries for convex targets and cannot effectively handle concave targets.

Method used

An adaptive mesh edge refinement method based on quadrilateral quadrilaterals is adopted. By using adaptive mesh edge refinement and ray intersection method, the edge patches of bright and dark areas are identified and subdivided. Combined with physical optics methods, induced current and induced magnetic current are calculated to realize radar cross section analysis of near-air targets.

Benefits of technology

While ensuring that the calculation error is within 1.5dB, the amount of unknown calculations is reduced by 91.15%, and the calculation efficiency and accuracy are improved. It has wide applicability, can accurately handle the shadow boundary tracing of concave and convex targets, and is suitable for the calculation of the scattering field data of coated targets in various radar bands.

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Abstract

The invention relates to a free target scattering characteristic analysis method based on adaptive grid edge encryption, and the method comprises the following steps: carrying out the subdivision of a pre-obtained free target model through a quadrilateral with a quadric surface, repeatedly carrying out the edge patch recognition and edge patch subdivision till the smoothness of a shadow boundary reaches the expectation, and obtaining a free target model; self-adaptive grid edge encryption is realized; a plasma sheath on the surface of a free target is equivalent to a uniform multilayer medium model, and vertical polarization reflection coefficients and horizontal polarization reflection coefficients from an air layer to each layer of the surface of the target are calculated; and based on the vertical polarization reflection coefficient and the horizontal polarization reflection coefficient, calculating a radar cross section of the free target, and realizing free target scattering characteristic analysis. Compared with the prior art, the method has the advantages that the unknown calculation amount is reduced on the premise that the calculation error is guaranteed, and the applicability is wide.
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