Modeling With Nurbs Surfaces Used for the Calculation of RCS

Abstract

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.

A Novel Simulation Approach of Aircraft Dynamic RCS

“…The aircraft shape is defined by CAD geometric modeling software using either a facets and wedges approximation or a parametric surface approach. With the help of NURBS curves, the accurate model can be built and then used for monostatic RCS calculation [6]. …”

A New Hybrid Mom-Gec Asymptotic Method for Electromagnetic Scattering Computation in Waveguides

“…The PO method consists in approximating the electric current density J P O on the surface of an object induced by an incident magnetic field H in [13,14]. The PO method relates approximatively the surface's current of a conductor to the incident magnetic field as:…”

“…Figure 4 shows the input impedance (Z in ) of the two considered structures against number of modes of waveguides in the frequency range [0, [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. It is obvious that for all structures, the Z in 's convergence is obtained for 100 modes of waveguides.…”

“…Others are called asymptotic methods. They are based on fields such as GO, GTD [8][9][10], UTD [11,12] or on currents such as PO [13,14], PTD [15,16]. They provide an approximate solution of Maxwell's equations, which tends to the exact solution at very high frequency.…”

New Benchmark Radar Targets for Scattering Analysis and Electromagnetic Software Validation

“…These codes are rigorous methods (or low frequency methods) where a direct discretization of the Maxwell equations in its differential form is performed. The last code is FASCRO, based on the work by [15,16], which uses a combination of two high frequency techniques: Physical Optics (PO) and Physical Theory of Diffraction (PTD) applied to objects modelled by NURBS surfaces [17][18][19]. The high frequency Figure 2.…”