Signature électromagnétique bistatique d'une cible complexe placée sur une surface maritime rugueuse PDF Download
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Author: Majid Rochdi
Publisher:
ISBN:
Category :
Languages : fr
Pages : 138
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Book Description
Les travaux réalisés ont pour principal objectif l’étude de l’interaction des ondes électromagnétiques avec une cible complexe; et aussi l’influence de l’environnement et les interactions EM qui peuvent avoir lieu entre la cible et la surface naturelle environnante considérée comme rugueuse. Ainsi, le présent travail vise l’étude et la simulation de la signature EM d’une cible complexe placée dans son environnement naturel. L’application retenue concerne la signature d’une cible complexe placée sur une surface maritime réaliste. La modélisation électromagnétique adoptée est basée sur les méthodes asymptotiques (Optique physique, Optique Géométrique, Méthode des Courants Equivalents) combinées à une méthode de tracer de rayons. La scène surface-cible est représentée par un ensemble de facettes triangulaires. Dans ce cadre, la cible maillée est générée à l’aide d’un outil de CAO (CATIA), quant à la surface de mer, elle est générée à partir du spectre de mer d’Elfouhaily. L’ensemble surface-cible est ensuite traité comme une seule cible complexe. La méthodologie proposée a été évaluée via des simulations et aussi par des expérimentations. Les résultats de simulation ont été comparés à ceux publiés dans la littérature ouverte. Quant aux expérimentations, elles ont été effectuées dans la chambre anéchoïque du laboratoire en considérant différentes cibles (canoniques et ensuite complexes).
Author: Majid Rochdi
Publisher:
ISBN:
Category :
Languages : fr
Pages : 138
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Book Description
Les travaux réalisés ont pour principal objectif l’étude de l’interaction des ondes électromagnétiques avec une cible complexe; et aussi l’influence de l’environnement et les interactions EM qui peuvent avoir lieu entre la cible et la surface naturelle environnante considérée comme rugueuse. Ainsi, le présent travail vise l’étude et la simulation de la signature EM d’une cible complexe placée dans son environnement naturel. L’application retenue concerne la signature d’une cible complexe placée sur une surface maritime réaliste. La modélisation électromagnétique adoptée est basée sur les méthodes asymptotiques (Optique physique, Optique Géométrique, Méthode des Courants Equivalents) combinées à une méthode de tracer de rayons. La scène surface-cible est représentée par un ensemble de facettes triangulaires. Dans ce cadre, la cible maillée est générée à l’aide d’un outil de CAO (CATIA), quant à la surface de mer, elle est générée à partir du spectre de mer d’Elfouhaily. L’ensemble surface-cible est ensuite traité comme une seule cible complexe. La méthodologie proposée a été évaluée via des simulations et aussi par des expérimentations. Les résultats de simulation ont été comparés à ceux publiés dans la littérature ouverte. Quant aux expérimentations, elles ont été effectuées dans la chambre anéchoïque du laboratoire en considérant différentes cibles (canoniques et ensuite complexes).
Author: Elmo E. Garrido
Publisher:
ISBN: 9781423534389
Category :
Languages : en
Pages : 85
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Book Description
This implementation of the physical optics approximation method for predicting the radar cross section (RCS) of complex objects utilizes the scientific computational features of MATLAB and its Graphical User Interface (Gui) functions to provide an error-free encoding of input parameters and efficient calculation. The POFACETS GUI provides a convenient tool for both students and electromagnetic professionals to design complex models by representing its component parts as triangular facets and offers options for defining the surface roughness of the scattering object. The GUI calculates the monostatic or bistatic radar cross section of the modeled object based on certain radar frequencies and parameters of interest, creates a variety of plots for the model geometry and its RCS measurement, and provides additional functionalities to enhance visualization of the object and check for accuracy of data. Various help windows and messages are available to the user to serve as guide in the efficient use of the GUI. The simplicity of the GUI design does not require the user to have a detailed understanding of the various steps involved in the RCS calculation.
Author: Claude Cohen-Tannoudji
Publisher: John Wiley & Sons
ISBN: 3527345558
Category : Science
Languages : en
Pages : 790
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Book Description
This new, third volume of Cohen-Tannoudji's groundbreaking textbook covers advanced topics of quantum mechanics such as uncorrelated and correlated identical particles, the quantum theory of the electromagnetic field, absorption, emission and scattering of photons by atoms, and quantum entanglement. Written in a didactically unrivalled manner, the textbook explains the fundamental concepts in seven chapters which are elaborated in accompanying complements that provide more detailed discussions, examples and applications. * Completing the success story: the third and final volume of the quantum mechanics textbook written by 1997 Nobel laureate Claude Cohen-Tannoudji and his colleagues Bernard Diu and Franck Laloë * As easily comprehensible as possible: all steps of the physical background and its mathematical representation are spelled out explicitly * Comprehensive: in addition to the fundamentals themselves, the books comes with a wealth of elaborately explained examples and applications Claude Cohen-Tannoudji was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris where he also studied and received his PhD in 1962. In 1973 he became Professor of atomic and molecular physics at the Collège des France. His main research interests were optical pumping, quantum optics and atom-photon interactions. In 1997, Claude Cohen-Tannoudji, together with Steven Chu and William D. Phillips, was awarded the Nobel Prize in Physics for his research on laser cooling and trapping of neutral atoms. Bernard Diu was Professor at the Denis Diderot University (Paris VII). He was engaged in research at the Laboratory of Theoretical Physics and High Energy where his focus was on strong interactions physics and statistical mechanics. Franck Laloë was a researcher at the Kastler-Brossel laboratory of the Ecole Normale Supérieure in Paris. His first assignment was with the University of Paris VI before he was appointed to the CNRS, the French National Research Center. His research was focused on optical pumping, statistical mechanics of quantum gases, musical acoustics and the foundations of quantum mechanics.
Author: Eugene F. Knott
Publisher: SciTech Publishing
ISBN: 1891121251
Category : Technology & Engineering
Languages : en
Pages : 628
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Book Description
The leading text and reference on radar cross section (RCS) theory and applications, this work presents a comparison of two radar signal strengths. One is the strength of the radar bean sweeping over a target, the other is the strength of the reflected echo senses by the receiver. This book shows how the RCS "gauge" can be predicted for theoretical objects.
Author: Chevalier François Le
Publisher: Artech House
ISBN: 9781608071357
Category : Radar
Languages : en
Pages : 422
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Book Description
Author: Levent Sevgi
Publisher: John Wiley & Sons
ISBN: 9780471430629
Category : Science
Languages : en
Pages : 412
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Book Description
Today, engineering problems are very complex, requiring powerful computer simulations to power them. For engineers, observable-based parameterization as well as numerically computable formsâ??with rapid convergent properties if in a seriesâ??are essential. Complex Electromagnetic Problems and Numerical Simulation Approaches, along with its companion FTP site, will show you how to take on complex electromagnetic problems and solve them in an accurate and efficient manner. Organized into two distinct parts, this comprehensive resource first introduces you to the concepts, approaches, and numerical simulation techniques that will be used throughout the book and then, in Part II, offers step-by-step guidance as to their practical, real-world applications. Self-contained chapters will enable you to find specific solutions to numerous problems. Filled with in-depth insight and expert advice, Complex Electromagnetic Problems and Numerical Simulation Approaches: Describes ground wave propagation Examines antenna systems Deals with radar cross section (RCS) modeling Explores microstrip network design with FDTD and TLM techniques Discusses electromagnetic compatibility (EMC) and bio-electromagnetics (BEM) modeling Presents radar simulation Whether you're a professional electromagnetic engineer requiring a consolidated overview of the subject or an academic/student who wishes to use powerful simulators as a learning tool, Complex Electromagnetic Problems and Numerical Simulation Approaches - with its focus on model development, model justification, and range of validity - is the right book for you.
Author: Jacques Lafontaine
Publisher: Springer
ISBN: 3319207350
Category : Mathematics
Languages : en
Pages : 408
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Book Description
This book is an introduction to differential manifolds. It gives solid preliminaries for more advanced topics: Riemannian manifolds, differential topology, Lie theory. It presupposes little background: the reader is only expected to master basic differential calculus, and a little point-set topology. The book covers the main topics of differential geometry: manifolds, tangent space, vector fields, differential forms, Lie groups, and a few more sophisticated topics such as de Rham cohomology, degree theory and the Gauss-Bonnet theorem for surfaces. Its ambition is to give solid foundations. In particular, the introduction of “abstract” notions such as manifolds or differential forms is motivated via questions and examples from mathematics or theoretical physics. More than 150 exercises, some of them easy and classical, some others more sophisticated, will help the beginner as well as the more expert reader. Solutions are provided for most of them. The book should be of interest to various readers: undergraduate and graduate students for a first contact to differential manifolds, mathematicians from other fields and physicists who wish to acquire some feeling about this beautiful theory. The original French text Introduction aux variétés différentielles has been a best-seller in its category in France for many years. Jacques Lafontaine was successively assistant Professor at Paris Diderot University and Professor at the University of Montpellier, where he is presently emeritus. His main research interests are Riemannian and pseudo-Riemannian geometry, including some aspects of mathematical relativity. Besides his personal research articles, he was involved in several textbooks and research monographs.
Author: Eric Servat
Publisher:
ISBN: 9781901502121
Category : Arid regions
Languages : fr
Pages : 518
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Book Description
Author: P. M. Banks
Publisher: Elsevier
ISBN: 1483260666
Category : Science
Languages : en
Pages : 445
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Book Description
Aeronomy, Part A is an attempt to make a comprehensive exposition of the processes in aeronomy, the study of composition, movement, and thermal balance of the upper regions of the planetary atmosphere. The text covers topics such as atmospheric regions and atmospheric density, the temperature and molecular mass of the atmosphere; the permanent constituents and the molecular and isotonic composition of the homosphere; and the transition from the homosphere to the heterosphere. Also covered are topics such as the temperature gradient and energies in the thermosphere, conditions at 200km and above 250km, solar radiation and ionization, and aeronomic reactions. The book is recommended for scientists, especially natural physicists, who would like to know more about the field of aeronomy and its advances.
Author: W. Petruk
Publisher: Elsevier
ISBN: 0080527337
Category : Technology & Engineering
Languages : en
Pages : 287
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Book Description
Techniques of performing applied mineralogy investigations, and applications and capabilities of recently developed instruments for measuring mineral properties are explored in this book intended for practicing applied mineralogists, students in mineralogy and metallurgy, and mineral processing engineers. The benefits of applied mineralogy are presented by using in-depth applied mineralogy studies on base metal ores, gold ores, porphyry copper ores, iron ores and industrial minerals as examples. The chapter on base metal ores includes a discussion on the effects of liberation, particle sizes and surfaces coatings of Pb, Cu, Fe, Ca and So4- on the recoveries of sphalerite, galena and chalcopyrite. The chapter on gold discusses various methods of determining the quantities of gold in different minerals, including 'invisible' gold in pyrite and arsenopyrite, so that a balance of the distribution of gold among the minerals can be calculated. This book also discusses the roles of pyrite, oxygen, moisture and bacterial (thiobacillus ferrooxidans) on reactions that produce acidic drainage from tailings piles, and summarizes currently used and proposed methods of remediation of acidic drainage.
