Computation of RCS of targets modelled with trimmed NURBS surfaces

Guan, Ying; Gong, Shuxi; Xu, Yanhong; Zha, Feng-Tao; Jiang, Wen

doi:10.1049/el.2009.1449

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…However, real objects often contain a large number of curved surfaces, which for convenience are often modeled using triangular facets. Although there were SBR methods based on NURBS surfaces [ 30 ], the performance loss is greater than that of triangular facets. Therefore, triangular facets are often used in practice.…”

Section: Methodsmentioning

confidence: 99%

Acceleration of shooting and bouncing ray method based on OptiX and normal vectors correction

Dong²,

Zhao³

et al. 2021

PLoS ONE

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The present paper deals with a new efficient shooting and bouncing ray (SBR) method based on OptiX and normal vectors correction. The basic idea is to make full use of the computing resources of the RTX series graphics cards. For ray tracing, the algorithm uses OptiX to invoke the built-in RT Cores of hardware. Thus, a fast intersection test can be implemented. To reduce the error of ray tracing caused by the facetted surface characterizing the curved surface, the direction of the reflected ray is corrected by normal vectors correction. Additionally, multiple GPU cores are invoked to accelerate the calculation of far-field integration of millions of ray tubes, which can improve the efficiency of the algorithm while reducing the data transmission time of heterogeneous devices. Simulation results show that the ray path after normal vectors correction is consistent with the theoretical results, and the algorithm can predict the RCS of arbitrary facetted geometries, which is 60 times faster than the SBR method based on kd-tree.

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Section: Methodsmentioning

confidence: 99%

Acceleration of shooting and bouncing ray method based on OptiX and normal vectors correction

Dong²,

Zhao³

et al. 2021

PLoS ONE

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“…For SPM, the CPU time is independent of frequency, on the other hand it is not valid in the computation of near field and this generates a problem as an incorrect impedance matrix [13]. In [15] RCS calculation is performed using SPM for trimmed NURBS surfaces.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Antennas around NURBS Surfaces by Using a Hybrid Method

Akcam¹,

Okan²

2018

RADIOENGINEERING

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To fast and accurately calculate the EM scattering problems like radiation of antenna around complex objects, many different techniques have been performed. However, these techniques (exact solution methods) either have a long calculation time or they (hybrid methods) tend to fail when the antenna is near or adjacent to structures. In this study, to make the scattering analysis of antennas fast and accurately, proposed stationary phase method (SPM) based hybrid MoM-PO method is implemented. For the geometrical modelling part, the antenna and its close vicinity is modelled with triangular facets, and the rest of the structure is modelled with non-uniform rational bspline (NURBS) surfaces which provides efficient and accurate modeling. Maximum 1.7 dB of difference in the radiation pattern is observed for an antenna positioned around a curvy plate, when the results are obtained by using MoM and the proposed method. Despite that little difference, the calculation time for MoM is around 41 minutes; whereas for the proposed hybrid method it is 9 seconds. Overall, this hybrid formulation and NURBS modeling allow a substantial reduction of computation time and memory requirement to analyze radiation of antennas that are even close or connected to structure surfaces.

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“…1. Though several approaches for PO integral calculation on the TNS have been developed, the lit regions for integration are still distinguished by the basic normal criterion [5,6]. Thus, for practical implementation, the efficient ray-tracing algorithms need to be developed for the TNS case.…”

Section: Introductionmentioning

confidence: 99%

Practical shadowing test for PO integral on trimmed NURBS surfaces

Yan

Nie

2015

2015 IEEE International Conference on Computational Electromagnetics

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A practical shadowing test technique for the trimmed NURBS surface (TNS) is presented in this work. By employing an efficient Bezier patch classification algorithm, a two-level hierarchical space partitioning volume (HSPV) is built for the TNS, where the leaves of the HSPV that contains trimmed off part of the original surface are marked out, making sure the shadowing test occurs on the effective part of the original surface. The numerical example demonstrates the effectiveness of the proposed method.

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Computation of RCS of targets modelled with trimmed NURBS surfaces

Cited by 8 publications

References 7 publications

Acceleration of shooting and bouncing ray method based on OptiX and normal vectors correction

Acceleration of shooting and bouncing ray method based on OptiX and normal vectors correction

Analysis of Antennas around NURBS Surfaces by Using a Hybrid Method

Practical shadowing test for PO integral on trimmed NURBS surfaces

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