ELECTROMAGNETIC BACKSCATTERING FROM A LAYER OF DISC SCATTERERS USING DISCRETE APPROACH AND RADIATIVE TRANSFER THEORY (RADAR CROSS-SECTION).
Item
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Title
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ELECTROMAGNETIC BACKSCATTERING FROM A LAYER OF DISC SCATTERERS USING DISCRETE APPROACH AND RADIATIVE TRANSFER THEORY (RADAR CROSS-SECTION).
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Identifier
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AAI8629739
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identifier
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8629739
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Creator
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SIDHU, JAGJEET SINGH.
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Contributor
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George Eichmann
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Date
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1986
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Electronics and Electrical
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Abstract
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Electromagnetic backscattering from a vegetation layer over a flat lossy ground is studied. The vegetated region is composed of leaves which are modelled by lossy dielectric discs. The vegetation components are assumed to have random placement and specified orientation statistics.;First, a case of single scattering from Rayleigh scatterers is studied. The problem is solved by finding the mean field in the vegetated region by using the Foldy approximation and a two-variable technique. Simple expressions are given for the skin depth of the mean wave. Following this, the distorted Born approximation is used to calculate the backscattering coefficients.;To study the effects of multiple scattering, the Radiative Transfer Theory with a Rayleigh scattering model is used. The radiative transfer equation and the boundary conditions are first formulated into the integral equations form. The Fourier series expansion in the azimuth direction is used to eliminate the (SLASHCIRC)-dependence from the radiative transfer equations. Then the set of equations without the (SLASHCIRC)-dependence are solved using the method of Gaussian quadrature.;Formulas for co-polarized and cross-polarized backscattering coefficients are derived and numerical results for the backscattering coefficients as a function of the incidence angle are presented for different layer depths and leaf configurations.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Engineering
