Vers une optimisation de l'interprétation des données radar : modélisation et traitement du signal PDF Download

Author: Fabrice Hollender
Publisher:
ISBN:
Category :
Languages : fr
Pages : 0

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Author: MOHCINE.. ZOUAK
Publisher:
ISBN:
Category :
Languages : fr
Pages : 294

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LE TRAVAIL PRESENTE SE PROPOSE DE MONTRER LES PERFORMANCES DES METHODES D'IDENTIFICATION ADAPTATIVES DANS LE TRAITEMENT DES SIGNAUX DU TYPE SECTION EFFICACE DE RETRODIFFUSION RENCONTRES DANS LE DOMAINE RADAR. UNE ANALYSE THEORIQUE A ETE REALISEE POUR MODELISER CE TYPE DE SIGNAUX. LE MODELE RETENU EST CELUI D'UNE SOMME BRUITEE DE CISOIDES A PARAMETRES VARIABLES DANS LE TEMPS. L'ANALYSE DE L'ESTIMATEUR DU MAXIMUM DE VRAISEMBLANCE ASSOCIE A CE PROBLEME MONTRE LE ROLE CRUCIAL DE L'ESTIMATION DES FREQUENCES DU A LA CORRELATION DE CETTE ESTIMATION AVEC LES AUTRES PARAMETRES RESTANT A ESTIMES. DE PLUS, ELLE A MONTRE QU'UNE OPTIMISATION DISJOINTE DES PARAMETRES INTERVENANT DANS LA MODELISATION EST POSSIBLE. AINSI, L'ESTIMATION ADAPTATIVE PEUT SE REALISER DE DEUX MANIERES: ? UNE ESTIMATION MODALE DONNANT DIRECTEMENT LES FREQUENCES ET LES AMPLITUDES COMPLEXES (AMPLITUDES ET DES PHASES INITIALES). ? UNE ESTIMATION SUCCESSIVE DES FREQUENCES PUIS DES AMPLITUDES ET DES PHASES INITIALES. LES DEUX APPROCHES ONT ETE ETUDIEES. POUR LA PREMIERE CLASSE DE METHODES, UNE MODIFICATION DE LA METHODE DE PRONY ADAPTATIVE EST PROPOSEE. POUR LA SECONDE, DEUX TECHNIQUES D'ESTIMATION FREQUENTIELLE SONT PROPOSEES: UNE ESTIMATION BASEE SUR LA POURSUITE DIRECTE DES RACINES DES POLYNOMES CARACTERISTIQUES ET UNE AUTRE REALISEE PAR UNE STRUCTURE DE FILTRES SELECTIFS ADAPTATIFS. AFIN D'AMELIORER LES PERFORMANCES EN PRECISION ET EN POURSUITE, UNE COMPENSATION DU BIAIS DE L'ESTIMATION FREQUENTIELLE A ETE INTRODUITE AINSI QU'UNE MODELISATION EVOLUTIVE DES VARIATIONS TEMPORELLES

Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Sensor and Propagation Panel. Symposium
Publisher:
ISBN:
Category : Radar
Languages : en
Pages : 200

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Author: George Dassios
Publisher: Oxford University Press
ISBN: 9780198536789
Category : Language Arts & Disciplines
Languages : en
Pages : 322

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Scattering theory deals with the interactions of waves with obstacles in their path, and low frequency scattering occurs when the obstacles involved are very small. This book gives an overview of the subject for graduates and researchers, for the first time unifying the theories covering acoustic, electromagnetic and elastic waves.

Author: S. Krall
Publisher: Birkhäuser
ISBN: 3034892020
Category : Technology & Engineering
Languages : en
Pages : 487

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In the late eighties large-scale control operations were carried out to control a major desert locust upsurge in Africa. For the first time since the banning of organochlorine pesticides these operations relied mainly on non-persistent pesticides such as organophosphates and pyrethroids. The amount of pesticides sprayed and the area covered were probably the highest in the history of locust control and raised criticism with respect to efficacy, economic viability and environmental impact. As a consequence, applied research into the problem was intensified, both at the national and the international level, with the goal of finding new and environmentally sound approaches and solutions to locust and grasshopper control. Emphasis was laid on developing new control agents and techniques.

Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting
Publisher:
ISBN: 9789283600374
Category : Airplanes
Languages : en
Pages : 190

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Author: Sven Boermeester
Publisher:
ISBN: 9781949677072
Category :
Languages : en
Pages :

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Innovate Bristol highlights and celebrates those companies and individuals that are actively working at building a better tomorrow for all. Innovation Ecosystems thrive through the involvement and support of companies and individuals from all industries, which is why the Innovate series not only focuses on the innovators but also those people whom the Innovation Ecosystem, would not be able to thrive without.

Author: Abdelmalek Amine
Publisher: Springer
ISBN: 331900560X
Category : Technology & Engineering
Languages : en
Pages : 443

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"During the last decades Computational Intelligence has emerged and showed its contributions in various broad research communities (computer science, engineering, finance, economic, decision making, etc.). This was done by proposing approaches and algorithms based either on turnkey techniques belonging to the large panoply of solutions offered by computational intelligence such as data mining, genetic algorithms, bio-inspired methods, Bayesian networks, machine learning, fuzzy logic, artificial neural networks, etc. or inspired by computational intelligence techniques to develop new ad-hoc algorithms for the problem under consideration. This volume is a comprehensive collection of extended contributions from the 4th International Conference on Computer Science and Its Applications (CIIA’2013) organized into four main tracks: Track 1: Computational Intelligence, Track 2: Security & Network Technologies, Track 3: Information Technology and Track 4: Computer Systems and Applications. This book presents recent advances in the use and exploitation of computational intelligence in several real world hard problems covering these tracks such as image processing, Arab text processing, sensor and mobile networks, physical design of advanced databases, model matching, etc. that require advanced approaches and algorithms borrowed from computational intelligence for solving them.

Author: Christian Huyghe
Publisher: Editions Quae
ISBN: 2759221563
Category : Nature
Languages : en
Pages : 322

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Funded by and written during theEuropean Multisward project, this open access ebook presents an inventory of grasslands and forage crops in Europe by placing them in the production system in which they are embedded, and studying the technical, economic and regulatory determinants of past and present trends. Profusely illustrated with maps, it also features many case studies in all European regions and interviews of farmers and key stakeholders.

Author: Yaakov Bar-Shalom
Publisher: John Wiley & Sons
ISBN: 0471465216
Category : Technology & Engineering
Languages : en
Pages : 583

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Expert coverage of the design and implementation of state estimation algorithms for tracking and navigation Estimation with Applications to Tracking and Navigation treats the estimation of various quantities from inherently inaccurate remote observations. It explains state estimator design using a balanced combination of linear systems, probability, and statistics. The authors provide a review of the necessary background mathematical techniques and offer an overview of the basic concepts in estimation. They then provide detailed treatments of all the major issues in estimation with a focus on applying these techniques to real systems. Other features include: * Problems that apply theoretical material to real-world applications * In-depth coverage of the Interacting Multiple Model (IMM) estimator * Companion DynaEst(TM) software for MATLAB(TM) implementation of Kalman filters and IMM estimators * Design guidelines for tracking filters Suitable for graduate engineering students and engineers working in remote sensors and tracking, Estimation with Applications to Tracking and Navigation provides expert coverage of this important area.