ETUDE ET MODIFICATION DE LA SIGNATURE RADAR DE CIBLES DIFFUSES EN SUSPENSION DANS L'ATMOSPHERE PDF Download
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Book Description
L'ETUDE DE LA SIGNATURE RADAR DE CIBLES DIFFUSES EN SUSPENSION DANS L'ATMOSPHERE PRESENTEE DANS CE MEMOIRE CONCERNE DES PRODUITS D'UTILISATION COURANTE COMME LES NUAGES DE DIPOLES ET EGALEMENT DES PRODUITS NOUVEAUX EN VUE D'AMELIORER LA CREDIBILITE DES LEURRES ACTUELS. EN PREMIERE PARTIE, APRES UN RAPPEL DES DIFFERENTES TECHNIQUES DE TRAITEMENT DU SIGNAL ET DES MODELES THEORIQUES DECRIVANT LA DIFFRACTION ELECTROMAGNETIQUE PAR DES CIBLES, NOUS DISTINGUONS LES DIFFERENCES DE SIGNATURE EXISTANTES ENTRE CIBLES PONCTUELLES ET LEURRES. LA DEUXIEME PARTIE TRAITE LA DIFFRACTION ELECTROMAGNETIQUE DE LEURRES EN SUSPENSION DANS L'ATMOSPHERE. LE MODELE ELECTROMAGNETIQUE UTILISE POUR DECRIRE LA DIFFRACTION PAR UN DIPOLE PARFAITEMENT CONDUCTEUR ET BASE SUR LES RESULTATS ANALYTIQUES DE VAN VLECK QUE NOUS AVONS VALIDES PAR COMPARAISON AVEC LA METHODE DES MOMENTS DE RICHMOND. APRES UNE ANALYSE EN LABORATOIRE DU MOUVEMENT DES DIPOLES EN CHUTE LIBRE EN ATMOSPHERE CALME, NOUS AVONS ETABLI UN MODELE AERODYNAMIQUE REALISTE DECRIVANT LES MOUVEMENTS DES DIPOLES EN SUSPENSION DANS UNE ATMOSPHERE VARIABLE. L'ENSEMBLE DE CETTE ETUDE A PERMIS L'ECRITURE DE PLUSIEURS LOGICIELS DE CALCUL DE LA SER INSTANTANEE DE NUAGES EN EXPANSION DANS L'ATMOSPHERE, AINSI QUE L'ANALYSE TRES FINE DE SIGNATURE DE CIBLES DIFFUSES. APRES AVOIR MIS EN EVIDENCE LA SIGNATURE CARACTERISTIQUE D'UN NUAGE DE DIPOLES, NOUS PRESENTONS UNE ETUDE DEBOUCHANT SUR UN PRODUIT INDUSTRIALISABLE TENDANT A AUGMENTER LA CREDIBILITE DES LEURRES PASSIFS SOUMIS AUX ANALYSES DE CIBLES ACTUELLES ET FUTURES
Book Description
L'ETUDE DE LA SIGNATURE RADAR DE CIBLES DIFFUSES EN SUSPENSION DANS L'ATMOSPHERE PRESENTEE DANS CE MEMOIRE CONCERNE DES PRODUITS D'UTILISATION COURANTE COMME LES NUAGES DE DIPOLES ET EGALEMENT DES PRODUITS NOUVEAUX EN VUE D'AMELIORER LA CREDIBILITE DES LEURRES ACTUELS. EN PREMIERE PARTIE, APRES UN RAPPEL DES DIFFERENTES TECHNIQUES DE TRAITEMENT DU SIGNAL ET DES MODELES THEORIQUES DECRIVANT LA DIFFRACTION ELECTROMAGNETIQUE PAR DES CIBLES, NOUS DISTINGUONS LES DIFFERENCES DE SIGNATURE EXISTANTES ENTRE CIBLES PONCTUELLES ET LEURRES. LA DEUXIEME PARTIE TRAITE LA DIFFRACTION ELECTROMAGNETIQUE DE LEURRES EN SUSPENSION DANS L'ATMOSPHERE. LE MODELE ELECTROMAGNETIQUE UTILISE POUR DECRIRE LA DIFFRACTION PAR UN DIPOLE PARFAITEMENT CONDUCTEUR ET BASE SUR LES RESULTATS ANALYTIQUES DE VAN VLECK QUE NOUS AVONS VALIDES PAR COMPARAISON AVEC LA METHODE DES MOMENTS DE RICHMOND. APRES UNE ANALYSE EN LABORATOIRE DU MOUVEMENT DES DIPOLES EN CHUTE LIBRE EN ATMOSPHERE CALME, NOUS AVONS ETABLI UN MODELE AERODYNAMIQUE REALISTE DECRIVANT LES MOUVEMENTS DES DIPOLES EN SUSPENSION DANS UNE ATMOSPHERE VARIABLE. L'ENSEMBLE DE CETTE ETUDE A PERMIS L'ECRITURE DE PLUSIEURS LOGICIELS DE CALCUL DE LA SER INSTANTANEE DE NUAGES EN EXPANSION DANS L'ATMOSPHERE, AINSI QUE L'ANALYSE TRES FINE DE SIGNATURE DE CIBLES DIFFUSES. APRES AVOIR MIS EN EVIDENCE LA SIGNATURE CARACTERISTIQUE D'UN NUAGE DE DIPOLES, NOUS PRESENTONS UNE ETUDE DEBOUCHANT SUR UN PRODUIT INDUSTRIALISABLE TENDANT A AUGMENTER LA CREDIBILITE DES LEURRES PASSIFS SOUMIS AUX ANALYSES DE CIBLES ACTUELLES ET FUTURES
Author: Claudia Kuenzer Publisher: Springer Science & Business Media ISBN: 9400766394 Category : Technology & Engineering Languages : en Pages : 547
Book Description
This book provides a comprehensive overview of the state of the art in the field of thermal infrared remote sensing. Temperature is one of the most important physical environmental variables monitored by earth observing remote sensing systems. Temperature ranges define the boundaries of habitats on our planet. Thermal hazards endanger our resources and well-being. In this book renowned international experts have contributed chapters on currently available thermal sensors as well as innovative plans for future missions. Further chapters discuss the underlying physics and image processing techniques for analyzing thermal data. Ground-breaking chapters on applications present a wide variety of case studies leading to a deepened understanding of land and sea surface temperature dynamics, urban heat island effects, forest fires, volcanic eruption precursors, underground coal fires, geothermal systems, soil moisture variability, and temperature-based mineral discrimination. ‘Thermal Infrared Remote Sensing: Sensors, Methods, Applications’ is unique because of the large field it spans, the potentials it reveals, and the detail it provides. This book is an indispensable volume for scientists, lecturers, and decision makers interested in thermal infrared technology, methods, and applications.
Author: Vincent C. H. Tong Publisher: Cambridge University Press ISBN: 1107041724 Category : Science Languages : en Pages : 467
Book Description
Taking a transdisciplinary approach to seismology, this unique book reviews the most recent developments in planetary seismology, helioseismology, and asteroseismology.
Author: Juan Manuel Sánchez Publisher: Mdpi AG ISBN: 9783036514284 Category : Science Languages : en Pages : 338
Book Description
This book is a collection of recent developments, methodologies, calibration and validation techniques, and applications of thermal remote sensing data and derived products from UAV-based, aerial, and satellite remote sensing. A set of 15 papers written by a total of 70 authors was selected for this book. The published papers cover a wide range of topics, which can be classified in five groups: algorithms, calibration and validation techniques, improvements in long-term consistency in satellite LST, downscaling of LST, and LST applications and land surface emissivity research.
Author: Food and Agriculture Organization of the United Nations Publisher: Food & Agriculture Org. ISBN: 9789251054147 Category : Business & Economics Languages : en Pages : 92
Book Description
The AQUASTAT programme was established to develop a comprehensive picture of water resources and irrigation in developing countries, and to give systematic, up-to-date and reliable information on water for agriculture and development. This report sets out an analysis of water availability and its use on the African continent and changes that have occurred over the last decade, with an emphasis on agricultural water use and management. The report includes a CD-ROM with detailed profiles on the situation in each of the 53 countries in Africa.
Author: A. Cazenave Publisher: Springer ISBN: 3319324497 Category : Science Languages : en Pages : 336
Book Description
This book is a collection of overview articles showing how space-based observations, combined with hydrological modeling, have considerably improved our knowledge of the continental water cycle and its sensitivity to climate change. Two main issues are highlighted: (1) the use in combination of space observations for monitoring water storage changes in river basins worldwide, and (2) the use of space data in hydrological modeling either through data assimilation or as external constraints. The water resources aspect is also addressed, as well as the impacts of direct anthropogenic forcing on land hydrology (e.g. ground water depletion, dam building on rivers, crop irrigation, changes in land use and agricultural practices, etc.). Remote sensing observations offer important new information on this important topic as well, which is highly useful for achieving water management objectives.Over the past 15 years, remote sensing techniques have increasingly demonstrated their capability to monitor components of the water balance of large river basins on time scales ranging from months to decades: satellite altimetry routinely monitors water level changes in large rivers, lakes and floodplains. When combined with satellite imagery, this technique can also measure surface water volume variations. Passive and active microwave sensors offer important information on soil moisture (e.g. the SMOS mission) as well as wetlands and snowpack. The GRACE space gravity mission offers, for the first time, the possibility of directly measuring spatio-temporal variations in the total vertically integrated terrestrial water storage. When combined with other space observations (e.g. from satellite altimetry and SMOS) or model estimates of surface waters and soil moisture, space gravity data can effectively measure groundwater storage variations. New satellite missions, planned for the coming years, will complement the constellation of satellites monitoring waters on land. This is particularly the case for the SWOT mission, which is expected to revolutionize land surface hydrology. Previously published in Surveys in Geophysics, Volume 37, No. 2, 2016
Author: LAURENT.. BOUILLOT
Author: LAURENT.. BOUILLOT
Author: Richard Escadafal
Author: Claudia Kuenzer
Author: Eric Servat
Author: Jerome O. Nriagu
Author: Vincent C. H. Tong
Author: Juan Manuel Sánchez
Author: Food and Agriculture Organization of the United Nations
Author: Rafael Almar
Author: A. Cazenave