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Radar Cross Section (radar + cross_section)

Distribution by Scientific Domains

Engineering	100%

Selected Abstracts

Sparse approximate inverse preconditioning of deflated block-GMRES algorithm for the fast monostatic RCS calculation

INTERNATIONAL JOURNAL OF NUMERICAL MODELLING: ELECTRONIC NETWORKS, DEVICES AND FIELDS, Issue 5 2008
P. L. Rui
Abstract A sparse approximate inverse (SAI) preconditioning of deflated block-generalized minimal residual (GMRES) algorithm is proposed to solve large dense linear systems with multiple right-hand sides arising from monostatic radar cross section (RCS) calculations. The multilevel fast multipole method (MLFMM) is used to accelerate the matrix,vector product operations, and the SAI preconditioning technique is employed to speed up the convergence rate of block-GMRES (BGMRES) iterations. The main purpose of this study is to show that the convergence rate of the SAI preconditioned BGMRES method can be significantly improved by deflating a few smallest eigenvalues. Numerical experiments indicate that the combined effect of the SAI preconditioning technique that clusters most of eigenvalues to one, coupled with the deflation technique that shifts the rest of the smallest eigenvalues in the spectrum, can be very beneficial in the MLFMM, thus reducing the overall simulation time substantially. Copyright © 2008 John Wiley & Sons, Ltd. [source]

Iterative solution of scattering by surface-treated targets

INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING, Issue 3 2003
A. Mami
Abstract An efficient iterative technique has been developed to compute the scattering behavior of the radar cross section of a conducting circular cylinder coated by a dielectric loaded with periodic metallic strips. This method is based on the concept of waves. It consists of establishing a relationship between electromagnetic fields and the incident-reflected waves. The numerical results for a number of scattering geometries are given to illustrate the efficiency and versatility of the present approach. © 2003 Wiley Periodicals, Inc. Int J RF and Microwave CAE 13: 206,214, 2003. [source]

Closed-form physical optics expressions for the radar cross section of perfectly conducting plane angular sectors

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 1 2008
Andrea Vallecchi
Abstract Closed-form expressions for the physical optics (PO) field scattered in the far zone by perfectly electrically conducting (PEC) plane angular sectors with a conical-section boundary are derived in terms of incomplete cylindrical functions (ICFs). The developed representations are very efficient from a computational point of view and constitute a useful tool to analytically predict the radar cross section (RCS) of metal plates with both convex and concave curved edges. The correctness of the proposed scattered field formulas is demonstrated through comparisons with the results obtained by an accurate completely numerical PO approach. A sample analysis of the scattering from a more elaborate geometry, which can be seen as a juxtaposition of angular sectors, is also presented. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 160,165, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22989 [source]

Experimental verification of the relation between the radar cross section and the list angle of surface vessels

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 11 2006
J. F. Pérez Ojeda
Abstract In this paper, the effect of ship angular motions on the radar cross section is addressed. To this end, a set of measurements for different ships were conducted from a shore-based instrumental radar. The targets execute oblique straight trajectories with respect to the radar line of sight with induced roll. The analysis of the dependence between target reflectivity and the roll angle shows that, for conventional vessels, the maximum response at low grazing angles is achieved in steady conditions, and it varies significantly according to the sign of the roll angle referred to the radar location. This result is confirmed by the comparison of measurements of a ship performing turning circles at several speeds, thus inducing different roll angles. © 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 2237,2241, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21932 [source]

Computer solutions of Maxwell's equations in homogeneous media

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, Issue 8 2003
O. Pironneau
Abstract This document is the material support for a talk given for JSIAM on the current methods for the computation of radar cross sections. The talk covers more than just computations of RCS and extends to any problem which involves the numerical solution of Maxwell's equations in homogeneous media. The talk is based on a review of the most recent papers in leading journals and on the author's experience. Copyright © 2003 John Wiley & Sons, Ltd. [source]