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Author: Stephanie Rouquette
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
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Book Description
Author: Stephanie Rouquette
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0
Get Book Here
Book Description
Author: Stéphanie Rouquette
Publisher:
ISBN:
Category :
Languages : fr
Pages : 137
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Book Description
CE MEMOIRE CONCERNE L'ETUDE DE SIGNAUX BIDIMENSIONNELS MODELISABLES PAR UNE SOMME D'EXPONENTIELLES. CETTE ETUDE EST REALISEE DANS LE CADRE DE L'ANALYSE SPECTRALE AVANT QUE NE SOIT CONSIDEREE L'APPLICATION RADAR. LES METHODES A HAUTE RESOLUTION PRESENTEES DANS CE MANUSCRIPT EXPLOITENT LE MODELE DU SIGNAL EN UTILISANT LA DECOMPOSITION EN SOUS-ESPACES SIGNAL ET BRUIT RELATIVE AUX DONNEES. LA PREMIERE PARTIE PORTE SUR L'ESTIMATION DES FREQUENCES DU SIGNAL VIA LE CALCUL D'UN SPECTRE DANS LE CADRE DE LA PREDICTION LINEAIRE. DE NOUVEAUX SUPPORTS DE PREDICTION DE TYPE QUART DE PLAN SONT INTRODUITS, CE QUI AMELIORE L'ALLURE DU SPECTRE ET AUGMENTE LA PRECISION DE L'ESTIMATION PAR RAPPORT AUX SUPPORTS QUART DE PLAN CLASSIQUES. LA DEUXIEME PARTIE CONCERNE DES TECHNIQUES D'ANALYSE SPECTRALE QUI ESTIMENT DIRECTEMENT LES FREQUENCES. CES METHODES REPOSENT SUR DES PROPRIETES D'INVARIANCE PAR TRANSLATION RELATIVES AUX DONNEES. LES FREQUENCES CORRESPONDANT A CHAQUE DIMENSION SONT ESTIMEES SEPAREMENT AVANT QUE NE SE POSE LE PROBLEME DE LA FORMATION DES PAIRES. DEUX ALGORITHMES FONDES SUR LA DIAGONALISATION CONJOINTE DE DEUX MATRICES SONT PROPOSES POUR FORMER LES PAIRES FREQUENTIELLES DE MANIERE EFFICACE. LA TROISIEME PARTIE PORTE SUR L'APPLICATION DES TECHNIQUES PRECEDENTES A LA LOCALISATION DES POINTS BRILLANTS D'UNE CIBLE DANS LE CONTEXTE DE LA FURTIVITE RADAR. NOUS PROPOSONS UN CRITERE EMPIRIQUE POUR DETERMINER LE NOMBRE D'EXPONENTIELLES, AINSI QU'UN PRE-TRAITEMENT DU SIGNAL QUI CONSISTE EN UNE DECOMPOSITION EN SOUS-BANDES FREQUENTIELLES SUIVIE D'UN SOUS-ECHANTILLONNAGE. CELA PERMET D'AUGMENTER LA PRECISION DES ETAPES DE DETECTION ET D'ESTIMATION.
Author: Guy Poulalion
Publisher:
ISBN:
Category :
Languages : fr
Pages : 159
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Book Description
LE PROBLEME TRAITE DANS CE MEMOIRE EST LIE A L'IMAGERIE RADAR ET CONCERNE PLUS PARTICULIEREMENT L'ANALYSE DE LA SURFACE EQUIVALENTE RADAR (SER) D'OBJETS DONT LE COMPORTEMENT N'EST PAS STATIONNAIRE. L'OBJECTIF EST DE DETECTER ET DE LOCALISER LES ZONES REFLECHISSANTES DE LA CIBLE. SOUS L'HYPOTHESE QUE LA CIBLE VERIFIE UN MODELE CONNU SOUS LE NOM DE MODELE DE POINTS BRILLANTS, LES POSITIONS DES ZONES REFLECHISSANTES SE DEDUISENT DES PULSATIONS D'UNE SOMME D'EXPONENTIELLES COMPLEXES. NOUS NOUS SOMMES ATTACHES A RESOUDRE CE PROBLEME EN UTILISANT LES METHODES D'ANALYSE SPECTRALE A HAUTE RESOLUTION (HR) BASEES SUR LA DECOMPOSITION DE L'ESPACE DES DONNEES EN DEUX SOUS-ESPACES, L'ESPACE DE SIGNAL ET L'ESPACE DE BRUIT. LE SCHEMA CLASSIQUE DE CES METHODES SE DECOMPOSE EN DEUX PHASES SEQUENTIELLES DE DETECTION (ESTIMATION DU NOMBRE DE COMPOSANTES) ET D'ESTIMATION (ESTIMATION DES PULSATIONS). CE SCHEMA EST SOUS-OPTIMAL DANS LE SENS OU IL LIE LA QUALITE DE L'ESTIMATION A CELLE DE LA DETECTION. OR CETTE DERNIERE SE REVELE PROBLEMATIQUE DANS LE CADRE DE L'ANALYSE DE SIGNAUX ISSUS DE MESURES. POUR REMEDIER A CETTE SOUS-OPTIMALITE, NOUS INTRODUISONS, POUR L'ETUDE DE SIGNAUX UNIDIMENSIONNELS ET STATIONNAIRES, UN NOUVEAU SCHEMA DE DETECTION ET D'ESTIMATION CONJOINTES. IL REPOSE SUR L'OBTENTION D'UN ENSEMBLE DE PULSATIONS CONTENANT LES PULSATIONS EXACTES DU SIGNAL. DEUX METHODES, BASEES SUR UNE APPROCHE DU MAXIMUM DE VRAISEMBLANCE SONT PROPOSEES POUR EXTRAIRE LES COMPOSANTES UTILES DE CET ENSEMBLE. NOUS ETENDONS ENSUITE CE SCHEMA POUR L'ANALYSE DE SIGNAUX BIDIMENSIONNELS ET POUR L'ANALYSE DE SIGNAUX NON-STATIONNAIRES. LE SCHEMA CLASSIQUE ET LE SCHEMA PROPOSE SONT COMPARES DANS LE CADRE DE L'ANALYSE DE SIGNAUX ISSUS DE MESURES DE SER. UNE APPLICATION ORIGINALE CONCERNANT LA RECONSTRUCTION D'UNE IMAGE TOMOGRAPHIQUE HR EST NOTAMMENT DEVELOPPEE.
Author: Jong-Sen Lee
Publisher: CRC Press
ISBN: 1420054988
Category : Technology & Engineering
Languages : en
Pages : 422
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Book Description
The recent launches of three fully polarimetric synthetic aperture radar (PolSAR) satellites have shown that polarimetric radar imaging can provide abundant data on the Earth’s environment, such as biomass and forest height estimation, snow cover mapping, glacier monitoring, and damage assessment. Written by two of the most recognized leaders in this field, Polarimetric Radar Imaging: From Basics to Applications presents polarimetric radar imaging and processing techniques and shows how to develop remote sensing applications using PolSAR imaging radar. The book provides a substantial and balanced introduction to the basic theory and advanced concepts of polarimetric scattering mechanisms, speckle statistics and speckle filtering, polarimetric information analysis and extraction techniques, and applications typical to radar polarimetric remote sensing. It explains the importance of wave polarization theory and the speckle phenomenon in the information retrieval problem of microwave imaging and inverse scattering. The authors demonstrate how to devise intelligent information extraction algorithms for remote sensing applications. They also describe more advanced polarimetric analysis techniques for polarimetric target decompositions, polarization orientation effects, polarimetric scattering modeling, speckle filtering, terrain and forest classification, manmade target analysis, and PolSAR interferometry. With sample PolSAR data sets and software available for download, this self-contained, hands-on book encourages you to analyze space-borne and airborne PolSAR and polarimetric interferometric SAR (Pol-InSAR) data and then develop applications using this data.
Author: F. P. Agterberg
Publisher: Energy, Mines and Resources Canada
ISBN: 9780660135922
Category : Science
Languages : en
Pages : 616
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Book Description
Collection of papers presented at the Colloquium, covering the broad subject areas of spatial data integration, statistical analysis of geoscience data, and quantitative stratigraphy. Working Group reports are included as well.
Author:
Publisher:
ISBN: 9783030249762
Category : Water-supply
Languages : en
Pages : 115
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Book Description
This book aims to exchange and share the experiences and research results on the geospatial technology applied in water resources management. It will present the most recent innovations, trends, challenges encountered and the solutions adopted in the area of geospatial technology. It will be beneficial for academicians, scientists, meteorologists, and consultants working in the field of water resources management.
Author: Maher I. Boulos
Publisher: Springer Nature
ISBN: 3030849368
Category : Science
Languages : en
Pages : 1973
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Book Description
This authoritative reference presents a comprehensive review of the evolution of plasma science and technology fundamentals over the past five decades. One of this field’s principal challenges has been its multidisciplinary nature requiring coverage of fundamental plasma physics in plasma generation, transport phenomena under high-temperature conditions, involving momentum, heat and mass transfer, and high-temperature reaction kinetics, as well as fundamentals of material science under extreme conditions. The book is structured in five distinct parts, which are presented in a reader-friendly format allowing for detailed coverage of the science base and engineering aspects of the technology including plasma generation, mathematical modeling, diagnostics, and industrial applications of thermal plasma technology. This book is an essential resource for practicing engineers, research scientists, and graduate students working in the field.
Author: Mehrez Zribi
Publisher: Elsevier
ISBN: 0128180862
Category : Science
Languages : en
Pages : 352
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Book Description
Water Resources in the Mediterranean Region summarizes and collates scientific developments around water resources in the Mediterranean socio-economic environment through a multidisciplinary framework synthesizing hydrology, hydrogeology, climate, bioclimatology, economics, and geography. As such, it provides essential information for any reader looking to learn more about the Mediterranean which is experiencing the impact of climate change and concurrent complex issues of anthropogenic effects, especially in agriculture and other resource uses. Water Resources in the Mediterranean Region covers different challenges in the issue of the evolution of water resources in the Mediterranean. It is intended for PhD students, research scientists, and managers interested in new solutions and approaches for water management and in the forecast of future water dynamics. Offers multidisciplinary content providing global visions of the challenges faced in the Mediterranean region Presents fundamental and operational studies, providing the reader with information on how to implement these actions and results themselves Written in a pedagogical manner, allowing for ease of reading for both researchers and water managers
Author: D. Marsal
Publisher: Elsevier
ISBN: 148329613X
Category : Mathematics
Languages : en
Pages : 187
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Book Description
Presents nearly all the important elementary and analytical methods of statistics, designed for the needs of the geoscientist and completely free from higher mathematics. Translated from the second German edition.
Author: Vladimir I︠A︡kovlevich Katkovnik
Publisher: SPIE-International Society for Optical Engineering
ISBN:
Category : Computers
Languages : en
Pages : 584
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Book Description
This book deals with a wide class of novel and efficient adaptive signal processing techniques developed to restore signals from noisy and degraded observations. These signals include those acquired from still or video cameras, electron microscopes, radar, X-rays, or ultrasound devices, and are used for various purposes, including entertainment, medical, business, industrial, military, civil, security, and scientific. In many cases useful information and high quality must be extracted from the imaging. However, often raw signals are not directly suitable for this purpose and must be processed in some way. Such processing is called signal reconstruction. This book is devoted to a recent and original approach to signal reconstruction based on combining two independent ideas: local polynomial approximation and the intersection of confidence interval rule.
