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Written for researchers and engineers working in the field, Radar Systems Analysis and Design Using MATLAB provides fundamental radar principles, advanced topics, and rigorous but easy-to-follow mathematical derivations.

Radar Systems Analysis and Design Using MATLAB

CHAPTER 4 – Integral Equation Solutions of Three-dimensional Scattering Problems

Results are presented of a set of computational electromagnetics validation measurements referring to three-dimensional perfectly conducting smooth targets, performed for the Electromagnetic Code Consortium. Plots are presented for both the low- and high-frequency measurements of the NASA almond, an ogive, a double ogive, a cone-sphere, and a cone-sphere with a gap.

Benchmark radar targets for the validation of computational electromagnetics programs

Microwave absorption enhancement of porous C@CoFe2O4 nanocomposites derived from eggshell membrane

We present a parametric model for radar scattering as a function of frequency and aspect angle. The model is used for analysis of synthetic aperture radar measurements. The estimated parameters provide a concise, physically relevant description of measured scattering for use in target recognition, data compression and scattering studies. The scattering model and an image domain estimation algorithm are applied to two measured data examples.

A parametric model for synthetic aperture radar measurements

An investigation of the scattering from rectangular flat plates has been carried out to determine analytical formulations suitable for the estimation of radar cross section. Simple physical optics theory provides an accurate means of predicting the near-specular values of plate cross section but fails to account for polarization dependence and detailed shape of the cross section vs. angle curve in nonspecular regions. Calculations based upon the geometrical theory of diffraction show excellent agreement with measured data except at edge-on aspects. This correspondence stems, in part, from the fact that the geometrical theory of diffraction is polarization dependent. The paper is concluded with an analytical description of vertical polarization cross section at the edge-on aspect derived on the basis of measurement data.

Radar cross section of rectangular flat plates as a function of aspect angle

Scattering by a semi-infinite perfectly conducting wedge with rounded edge is formulated for line-source excitation using the boundary-value approach. Numerical results are presented for the important case of monostatic plane-wave scattering in the far field. These results comprise principal-polarization data plotted as a function of aspect angle for 60\deg , 90\deg , and 120\deg wedges with maximum rounding ka of 4, where ka is the electrical radius of curvature of the edge. Observations uniformly conform with qualitative predictions based upon simple scattering arguments. It is shown that ka as small as 0.8 can double the sharp wedge result at symmetrical incidence, although the effect of rounding is markedly dependent upon polarization and wedge angle. For ka \leq 1 , the solution is viewed as the sharp wedge result plus a perturbation field which exhibits simple parametric dependencies. In particular, the aspect dependence of these perturbations can be accurately extracted. The present work is a preliminary step in extension of high-frequency asymptotic theory to finite targets having rounded as well as sharp edges.

Scattering by a wedge with rounded edge

High-frequency scattering by a finite perfectly conducting right-circular cone is analyzed by modifying geometrical diffraction theory for application at and near nose-on aspects. Formulas appropriate for predicting principal-polarization radar cross sections as functions of frequency and aspect angle are presented. Calculations on a cone are in very good agreement with monostatic measurement data in the limited aspect interval 0 \leq \phi \leq \gamma , where \gamma , is the half-angle of the cone.

Small-angle scattering by a finite cone

Scattering of a plane wave by a conducting frustum is treated by geometrical diffraction theory. Formulas appropriate for calculating the scattering matrix as a function of frequency, aspect angle, and bistatic angle are presented. Calculations for two frustums are in very good agreement with bistatic measurement data.

R. Ross

Papers

Radar cross section of rectangular flat plates as a function of aspect angle

Scattering by a wedge with rounded edge

Small-angle scattering by a finite cone

Bistatic scattering matrix for a frustrum