Method Based on Physical Optics for the Computation of the Radar Cross Section Including Diffraction and Double Effects of Metallic and Absorbing Bodies Modeled With Parametric Surfaces

Adana, Francisco Sáez de; Diego, Iván González; Blanco, Oscar Gutiérrez; Lozano, P.; Cátedra, M.F.

doi:10.1109/tap.2004.836444

Cited by 48 publications

(19 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Modified Equivalent Current Approximation (MECA) method: a PO extension for penetrable and non-metallic objects Even though several electromagnetic problems fulfil the restrictions by the PO approximation in terms of electric size or radius of curvature, the characterization of the obstacles as perfect electric conductors reduces the scope of application of this high frequency technique. Previous works (Rengarajan & Gillespie, 1988;Hodges & Rahmat-Samii, 1993, Sáez de Adana et al, 2004 agree that the extension of the PO approximation for penetrable and nonmetallic objects have to account for the reflection coefficients R in order to apply the boundary conditions at the interface between the two media -one of the media uses to be the air. In this context, it is convenient to accomplish a decomposition of the incident fields into their transversal electric (TE) and transversal magnetic (TM) components to independently insert R TE and R TM in the evaluation of the equivalent current densities:…”

Section: Po Formulationmentioning

confidence: 99%

High Frequency Techniques: the Physical Optics Approximation and the Modified Equivalent Current Approximation (MECA)

Gutierrez-Meana¹,

Martínez-Lorenzo²,

Las-Heras³

2011

Electromagnetic Waves Propagation in Complex Matter

View full text Add to dashboard Cite

Section: Po Formulationmentioning

confidence: 99%

High Frequency Techniques: the Physical Optics Approximation and the Modified Equivalent Current Approximation (MECA)

Gutierrez-Meana¹,

Martínez-Lorenzo²,

Las-Heras³

2011

Electromagnetic Waves Propagation in Complex Matter

View full text Add to dashboard Cite

“…NURBS based PO (NURBS-PO) is therefore developed to predict the scattering of PEC bodies, where solving the critical points on the NURBS surface by the method of stationary point enables the NURBS-PO to enjoy a fast calculation of the PO integral on such parametric surface [1]. Further research on NURBS-PO adopts the equivalent current method of the physical theory of diffraction (PTD) framework to analyze the wedge diffraction, however, only the straight wedge case is considered [4]. To the authors's knowledge, the correction to curved wedge for NURBS-PO has not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Diffraction Calculation of Arbitrarily Curved Wedge Modeled With Nurbs Surfaces

Yan¹,

Hu²,

Zhao³

et al. 2015

PIER M

View full text Add to dashboard Cite

Abstract-In this paper, we present an equivalent current-based numerical routine for calculating the diffraction of arbitrarily curved wedge modeled with non-uniform rational B-spline (NURBS) curves and surfaces. The NURBS curves and surfaces obtained from CAD systems need to be parameterized for numerical calculation; however, available parameterizing approaches in rendering computer graphics, which use straight line segments and flat facets for tessellation, are not suitable for the computation of the wedge diffraction. To make the full use of NURBS modeling technique in high-frequency asymptotic approaches, the proposed numerical routine utilizes a curvature adaptive tessellation scheme to parameterize the edge curve of the wedge with varying curvature as well as the method of parameter alignment to maintain the C 0 continuity between the edge curve and the wedge surfaces, which is essential in evaluating the diffraction coefficients. Based on the proposed parameterizing method, the equivalent edge current can be implemented for diffraction computation of arbitrarily curved wedge modeled with NURBS curves and surfaces, complementing with the NURBS based physical optics (PO) as a fully NURBS-based high-frequency approach, which provides high geometrical accuracy and computational efficiency for calculating diffraction of electrically large curved wedges. Numerical examples are presented to validate the proposed method.

show abstract

“…The technology of electromagnetic modeling is one of the hottest issues in Computational Electromagnetics, and it is one of the most important problems in the RCS calculation [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

“…With the development of Computer Aided Geometric Design (CAGD), NURBS [5][6][7][8][9][10] technique is currently widely used in many industries to represent complex bodies. The method is quite efficient because it makes use of a small number of patches to model complex bodies, so it requires very little memory and computing time.…”

Section: Introductionmentioning

confidence: 99%

“…In Computational Electromagnetics, many scholars do their best to study the methods for computing RCS with NURBS surface models. There have been many methods which are used with NURBS models for calculating RCS, such as the Moment Method (MOM) [5,6], the Physical Optics (PO) method [6][7][8][9][10], the Geometrical Optics (GO) method [9], the Equivalent Currents Method (EMC) [9,10], and so on. But the most models which have existed are edge-facet models, and to a real model it is impossible to obtain NURBS parameters directly.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Modeling With Nurbs Surfaces Used for the Calculation of RCS

Yan¹,

Shi²,

Xu³

2008

PIER

View full text Add to dashboard Cite

Abstract-In this paper, the edge-facet model is transformed to the Non-Uniform Rational B-Spline (NURBS) model. The parameters of the knot vectors and the control points of NURBS are computed based on the data points on the surface of a target, and the NURBS model is constructed with the parameters. The degrees of the two parametric directions of a NURBS surface and the B-spline basis function are also analyzed. The relative errors between the NURBS models and the real models prove that the modeling method proposed in this paper is exact. Finally, the results of the Radar Cross Section (RCS) computed by the Physical Optics (PO) method with NURBS models are illustrated, and the results prove that the modeling method is of high precision and can be widely used in computational electromagnetics techniques.

show abstract

Method Based on Physical Optics for the Computation of the Radar Cross Section Including Diffraction and Double Effects of Metallic and Absorbing Bodies Modeled With Parametric Surfaces

Cited by 48 publications

References 16 publications

High Frequency Techniques: the Physical Optics Approximation and the Modified Equivalent Current Approximation (MECA)

High Frequency Techniques: the Physical Optics Approximation and the Modified Equivalent Current Approximation (MECA)

Diffraction Calculation of Arbitrarily Curved Wedge Modeled With Nurbs Surfaces

Modeling With Nurbs Surfaces Used for the Calculation of RCS

Contact Info

Product

Resources

About