Surface Correlation Relationships in Rough Surface Scattering PDF Download
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Author: R. J. Papa
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Book Description
There are a number of approaches to the calculation of the electromagnetic scattering from rough surfaces. These techniques are important in the determination of the effects of the real environment on radar and communications systems. The models contain descriptions of the surface in terms of the statistical distribution of the heights and their degree of correlation. These features are then related to a normalized radar cross section for the terrain, sigma deg, through an electromagnetic analysis. In this report we are concerned with questions involving the application of physical optics principles to the analysis. This is important since this approach is used extensively both as a complete solution and as part of composite models. Secondly, we discussed several areas where the statistics and correlation have important roles in determining the scattering from a random rough surface. This is significant in that the usual assumption of a Gaussian distribution of heights with Gaussian correlation may not apply to all types surfaces. Power spectra results suggest that other forms would be more appropriate for some cases. In the beginning of this report, we examine statistical descriptors of a surface and establish the relationship between them and the conditions for applying a physical optics model to the scattering from that surface. We then examine the sensitivity of the distribution of scattered power to changes in the form of the surface height statistics and correlation function. Specifically, we examine the effect of three different correlation functions on the normalized bistatic cross section of a rough surface.
Author: R. J. Papa
Publisher:
ISBN:
Category :
Languages : en
Pages : 36
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Book Description
There are a number of approaches to the calculation of the electromagnetic scattering from rough surfaces. These techniques are important in the determination of the effects of the real environment on radar and communications systems. The models contain descriptions of the surface in terms of the statistical distribution of the heights and their degree of correlation. These features are then related to a normalized radar cross section for the terrain, sigma deg, through an electromagnetic analysis. In this report we are concerned with questions involving the application of physical optics principles to the analysis. This is important since this approach is used extensively both as a complete solution and as part of composite models. Secondly, we discussed several areas where the statistics and correlation have important roles in determining the scattering from a random rough surface. This is significant in that the usual assumption of a Gaussian distribution of heights with Gaussian correlation may not apply to all types surfaces. Power spectra results suggest that other forms would be more appropriate for some cases. In the beginning of this report, we examine statistical descriptors of a surface and establish the relationship between them and the conditions for applying a physical optics model to the scattering from that surface. We then examine the sensitivity of the distribution of scattered power to changes in the form of the surface height statistics and correlation function. Specifically, we examine the effect of three different correlation functions on the normalized bistatic cross section of a rough surface.
Author: Zu-Han Gu
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
The first theoretical studies of angular correlations in the intensity of light scattered from randomly rough metal surfaces, that go beyond the factorization approximation, have been carried out. As a consequence, in addition to the memory and the time-reversed memory effects studied by earlier authors, known as the short-range C(1) correlations, the long-range C(2) correlations and the infinite-range C(3) correlations have been determined. The latter two correlation functions had been studied earlier in the scattering of light from volume disordered systems, but had not yet been studied in rough surface scattering. In addition, a new correlation function, called C(10), of the same order of magnitude as C(1) has been found, as well as another new correlation function, called C(1.5), that, along with C(2), displays peaks associated with the roughness-induced excitation of the surface electromagnetic waves supported by the vacuum-metal interface. The invalidity of the factorization approximation for weakly rough random surfaces has also been established in another set of calculations. Experimental studies of the memory and time-reversed memory effects have been carried out, as have studies of the effects of localized defects on angular correlations in the intensity of light scattered from random surfaces.
Author: J. A. Ogilvy
Publisher: CRC Press
ISBN:
Category : Art
Languages : en
Pages : 300
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Book Description
A review of theories developed for the study of acoustic, elastic and electromagnetic wave scattering from randomly rough surfaces, and a comprehensive summary of the latest techniques. Different theories are illustrated by experimental data.With applications in radar, sonar, ultrasonics and optics this book will be invaluable to graduate students, researchers and engineers.
Author: David Anthony Kapp
Publisher:
ISBN:
Category : Scattering (Physics)
Languages : en
Pages : 514
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Book Description
Author: F. G. Bass
Publisher: Elsevier
ISBN: 1483187756
Category : Science
Languages : en
Pages : 541
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Book Description
Wave Scattering from Statistically Rough Surfaces discusses the complications in radio physics and hydro-acoustics in relation to wave transmission under settings seen in nature. Some of the topics that are covered include radar and sonar, the effect of variations in topographic relief or ocean waves on the transmission of radio and sound waves, the reproduction of radio waves from the lower layers of the ionosphere, and the oscillations of signals within the earth-ionosphere waveguide. The book begins with some fundamental idea of wave transmission theory and the theory of random processes as used to rough surfaces and to wave fields. This discussion is followed by an analysis of the average fields of sound and electromagnetic waves. A section on spatial correlation characteristics in the approximation of small perturbations is then given. Another chapter of the text explains the Kirchhoff method. The book will provide useful information to physicists, mechanical engineer, students, and researchers in the field of acoustics.
Author: Alexei A. Maradudin
Publisher: Springer Science & Business Media
ISBN: 0387356592
Category : Science
Languages : en
Pages : 513
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Book Description
This book covers both experimental and theoretical aspects of nanoscale light scattering and surface roughness. Topics include: spherical particles located on a substrate; surface and buried interface roughness; surface roughness of polymer thin films; magnetic and thermal fluctuations at planar surfaces; speckle patterns; scattering of electromagnetic waves from a metal; multiple wavelength light scattering; nanoroughness standards.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 23
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Book Description
A combined theoretical and experimental research program on "Correlation-induced Frequency Shift from Rough Surface Scattering" has been implemented. This study has increased our understanding of localization, coherence and fluctuation from rough surface scattering. The results should have potential application in radar signature, telecommunication, remote sensing, satellite tracking, mine detection and target acquisition and classification.
Author: Kun-Shan Chen
Publisher: CRC Press
ISBN: 1351011561
Category : Technology & Engineering
Languages : en
Pages : 323
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Book Description
Radar scattering and imaging of rough surfaces is an active interdisciplinary area of research with many practical applications in fields such as mineral and resource exploration, ocean and physical oceanography, military and national defense, planetary exploration, city planning and land use, environmental science, and many more. By focusing on the most advanced analytical and numerical modeling and describing both forward and inverse modeling, Radar Scattering and Imaging of Rough Surfaces: Modeling and Applications with MATLAB® connects the scattering process to imaging techniques by vivid examples through numerical and experimental demonstrations and provides computer codes and practical uses. This book is unique in its simultaneous treatment of radar scattering and imaging. Key Features Bridges physical modeling with simulation for resolving radar imaging problems (the first comprehensive work to do so) Provides excellent basic and advanced information for microwave remote-sensing professionals in various fields of science and engineering Covers most advanced analytical and numerical modeling for both backscattering and bistatic scattering Includes MATLAB® codes useful not only for academics but also for radar engineers and scientists to develop tools applicable in different areas of earth studies Covering both the theoretical and the practical, Radar Scattering and Imaging of Rough Surfaces: Modeling and Applications with MATLAB® is an invaluable resource for professionals and students using remote sensing to study and explain the Earth and its processes. University and research institutes, electrical and radar engineers, remote-sensing image users, application software developers, students, and academics alike will benefit from this book. The author, Kun-Shan Chen, is an internationally known and respected engineer and scientist and an expert in the field of electromagnetic modeling.
Author: J. G. Watson
Publisher:
ISBN:
Category :
Languages : en
Pages : 7
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Book Description
The smoothing method is used to find the first two moments, i.e., the mean and the two-point two-time correlation function, of the field scattered by a rough surface. The results are expressed in terms of a reflection coefficient and a differential scattering coefficient. They are compared with those found by several other methods. (Author).
Author: Oleg V. Angelsky
Publisher: SPIE Press
ISBN: 9780819434906
Category : Computers
Languages : en
Pages : 206
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Book Description
This monograph examines the possibilities for diagnostics of light-scattering objects and media by utilizing the properties of coherent optical radiation. Special emphasis is placed on diagnostics of rough surfaces. Ideas formulated in classical work on statistical radiophysics and optics have been adapted to diagnostic applications. The text includes unique techniques and unconventional methods aimed at obtaining the maximum information available.
