A numerical study of electromagnetic scattering from ocean‐like surfaces

Lentz, Ronald R.

doi:10.1029/rs009i012p01139

Cited by 38 publications

(4 citation statements)

References 11 publications

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“…Our method for scattering-pattern calculations can be compared with methods similar to those discussed by Lentz [1974]. As was indicated there, point-matching techniques require several points for each electromagnetic wavelength of the illuminated area and thus are usually limited by computer storage to relatively short illuminated lengths (<60X).…”

Section: In Addition the Rayleigh Approximations To Thementioning

confidence: 99%

Electromagnetic scattering patterns from sinusoidal surfaces

Jordan¹,

Lang²

1979

Radio Science

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In this paper we present an analysis and calculation of scattering patterns from sinusoidal surfaces. An exact space harmonic representation is used for the field on the surface, and as a result, the calculation includes the effects of shadowing, diffraction, and multiple scattering. An asymptotic evaluation has been employed to obtain an exact expression for the scattering pattern as a product of the space harmonic scattering coefficients times the corresponding pattern functions. The formula obtained has been simplified for illuminated areas that are many wavelengths long and plotted for a variety of surface parameters. The present method for scattering pattern calculations can be considered to be complementary to methods using physical optics and point-matching techniques. In addition to the scattering pattern calculations the exact Bragg backscattering amplitudes have been computed and compared with their Rayleigh approximations.

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Section: In Addition the Rayleigh Approximations To Thementioning

confidence: 99%

Electromagnetic scattering patterns from sinusoidal surfaces

Jordan¹,

Lang²

1979

Radio Science

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“…Since [38], it has been extensively applied to radio wave scattering from the sea surface. In its usual formulation, it involves a regular sampling of the rough surface [17], [39], [40] and can thus be used for linear as well as Creamer surfaces for which the elevation can be explicitly defined at every sampling point.…”

Section: Mom For "Choppy" Surfacesmentioning

confidence: 99%

Sea Surface Microwave Scattering at Extreme Grazing Angle: Numerical Investigation of the Doppler Shift

Miret

Soriano

Nouguier

et al. 2014

IEEE Trans. Geosci. Remote Sensing

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Abstract-We present a numerical investigation of horizontally polarized microwave scattering from 1-D sea surfaces at extreme grazing angles. Rigorous electromagnetic calculations are performed with a specific integral formalism dedicated to grazing angles. Sample sea surfaces are simulated using a classical Pierson-Moskowitz elevation spectrum together with weakly nonlinear hydrodynamic models, namely, the Creamer solution, the "choppy wave model," and a recent improved version thereof. For this, the electromagnetic integral formalism is extended to surfaces with irregular sampling. For the different nonlinear surface models and assuming no large-scale current, we evidence a dramatic increase, followed by a saturation of the mean Doppler shift in the last few grazing degrees, with a limiting value depending quasilinearly on the significant wave height. Our numerical investigations confirm that breaking events are not necessary to produce fast scatterers but tend to show that they are necessary to reproduce the elevated level of backscattered power. The results of this study also support the hypothesis that the blow-up of the mean Doppler shift at grazing angle is associated to an electromagnetic sharp edge effect on the large surface crests rather than geometrical shadowing of the troughs.Index Terms-Doppler effect, method of moments, sea surface.

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“…These techniques are limited by the roughness, the incident angle, and so forth. Some numerical methods are also employed, which include the Monte Carlo method [5], the finite difference time-domain (FDTD) [6,7] method, method of moments (MOM) [8,9], the finite element method (FEM) [10], and the forward back method (FBM) [11], the fast multipole method (FMM) [12].…”

Section: Introductionmentioning

confidence: 99%

Time-Domain Physical Optics Method for the Analysis of Wide-Band EM Scattering from Two-Dimensional Conducting Rough Surface

Chen

Guo

2013

International Journal of Antennas and Propagation

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Time-domain physical optics (TDPO) method is extended to investigate electromagnetic (EM) scattering from two-dimensional (2D) perfectly electrically conducting (PEC) rough surface in both time domain and frequency domain. The scheme requires relatively small amounts of computer memory and CPU time, and has advantage over the Kirchhoff Approximation (KA) method in obtaining transient response of rough surface by a program run. The 2D Gaussian randomly rough surface is generated by Monte Carlo method and then is partitioned into small triangle facets through the meshing preprocess. The accuracy of TDPO is validated by comparing the numerical results with those obtained by the KA method in both backward and specular directions. The transient response and its frequency distribution of radar cross section (RCS) from rough surface is shown, respectively. The scattering results from rough surface with different size in the specular direction are given. The influence of the root mean square height (σ) and correlation length (l) on electromagnetic scattering from PEC rough surface is discussed in detail. Finally, the comparisons of backscattering results at different incident angles are presented and analyzed.

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A numerical study of electromagnetic scattering from ocean‐like surfaces

Cited by 38 publications

References 11 publications

Electromagnetic scattering patterns from sinusoidal surfaces

Electromagnetic scattering patterns from sinusoidal surfaces

Sea Surface Microwave Scattering at Extreme Grazing Angle: Numerical Investigation of the Doppler Shift

Time-Domain Physical Optics Method for the Analysis of Wide-Band EM Scattering from Two-Dimensional Conducting Rough Surface

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