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Commande Optique Dantennes Radars A Balayage Electronique
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Book Synopsis COMMANDE OPTIQUE D'ANTENNES RADARS A BALAYAGE ELECTRONIQUE by : DANIEL.. DOLFI
Download or read book COMMANDE OPTIQUE D'ANTENNES RADARS A BALAYAGE ELECTRONIQUE written by DANIEL.. DOLFI and published by . This book was released on 1993 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE BALAYAGE ELECTRONIQUE DANS UNE ANTENNE RADAR EST OBTENU PAR MODIFICATION DE LA LOI D'ECLAIREMENT (AMPLITUDE ET PHASE) DE SES ELEMENTS RAYONNANTS. DANS LE CAS D'ANGLES DE BALAYAGE IMPORTANTS ET D'UN FONCTIONNEMENT SUR UNE LARGE BANDE DE FREQUENCE, CES SYSTEMES RADAR REQUIERENT LE CONTROLE DE L'ANTENNE AU MOYEN DE RETARDS TEMPORELS. LA REALISATION DE TELS RETARDS RECONFIGURABLES EN TECHNOLOGIE HYPERFREQUENCE EST QUASI-IMPOSSIBLE. CE MEMOIRE PRESENTE L'ETUDE ET LA REALISATION D'UNE COMMANDE OPTIQUE BIDIMENSIONNELLE EN RETARDS ET DEPHASAGE D'UNE ANTENNE A BALAYAGE ELECTRONIQUE FONCTIONNANT A L'EMISSION. NOUS AVONS ETUDIE DEUX ARCHITECTURES, FONDEES SUR LA COMMUTATION DE POLARISATION D'UNE PORTEUSE OPTIQUE DU SIGNAL MICROONDE PAR DES MODULATEURS SPATIAUX DE LUMIERE. LA PLUS PERFORMANTE FOURNIT 2#N VALEURS DE RETARDS ET UN CONTROLE CONTINU DE LA PHASE 0, 2 SUR PXP CANAUX INDEPENDANTS AU MOYEN DE N MODULATEURS SPATIAUX. LE CHOIX D'UNE PORTEUSE OPTIQUE BIFREQUENCE DU SIGNAL MICROONDE A ETE JUSTIFIE. LE PRINCIPE DE FONCTIONNEMENT DE L'ENSEMBLE A ETE DEMONTRE EXPERIMENTALEMENT A 2 GHZ (32 VALEURS DE RETARDS, CONTROLE DE LA PHASE DU SIGNAL HYPERFREQUENCE ENTRE 0 ET 2 SUR 3 X 3 CANAUX). L'EXTENSION DE CE PRINCIPE A UNE ANTENNE REALISTE DE 10#3 ELEMENTS RAYONNANTS A ETE ANALYSEE ET LE DIMENSIONNEMENT DE LA COMMANDE OPTIQUE DE CETTE DERNIERE A ETE PROPOSE. L'AMPLIFICATION DE LA PORTEUSE BIFREQUENCE DU SIGNAL MICROONDE PAR MELANGE A DEUX ONDES DANS UN CRISTAL PHOTOREFRACTIF DE BATIO#3, PARTICULIEREMENT ADAPTEE A LA COMMANDE D'ANTENNE, A EGALEMENT ETE PROPOSEE ET VALIDEE EXPERIMENTALEMENT A 2 GHZ. LA GENERATION D'UNE PORTEUSE BIFREQUENCE AUTOALIGNEE DU SIGNAL MICROONDE AU MOYEN D'UNE INTERACTION INCOHERENTE DANS BATIO#3 A ETE VALIDEE EXPERIMENTALEMENT. ELLE RESULTE DE L'INTERACTION ENTRE LES BRUITS PROPRES GENERES PAR CHACUNE DES COMPOSANTES DE LA PORTEUSE ET A PU ETRE ETENDUE AU COUPLAGE DE DEUX LASERS MUTUELLEMENT INCOHERENTS. UN NOUVEAU TYPE DE PHOTODETECTEUR A BASE DE PHOTOCONDUCTEUR A ETE PROPOSE. IL EXPLOITE LE DEPLACEMENT SYNCHRONE DES PORTEURS ET D'UNE FIGURE D'INTERFERENCE QUI LES GENERE, DANS UN MATERIAU SEMICONDUCTEUR, POUR AUTORISER UN VOLUME DE PHOTODETECTION IMPORTANT ET DONC UNE PUISSANCE DE SATURATION ELEVEE. CETTE DERNIERE DOIT PERMETTRE LA GENERATION DE SIGNAUX HYPERFREQUENCE DE PUISSANCE NECESSAIRES AU RAYONNEMENT DE L'ANTENNE
Download or read book Dictionary of Electronics written by and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 545 pages. Available in PDF, EPUB and Kindle. Book excerpt: The special interest in electronics all over the world is due to its decisive role in the scien tific and technical progress now taking place in all fields of modern technology. Electronics also plays a decisive role in the development of science, providing as it does the technical basis for various scientific experiments. The role of electronics in the development of the world's culture also deserves a special mention. That is why it is hoped that the English-German French-Dutch-Russian Dictionary of Electronics, which contains some 9.000 entries and is jointly published by Kluwer Technische Boeken, B.V. (Deventer, Holland) and Ruski Yazyk Publishers (Moscow, USSR) will be favourably received. In accordance with existing international tradition, the term «electronics» covers several fields known in Soviet classification as elec tronics proper, radio engineering, and wire communication. The entries included in this dictionary have been selected in accordance with the international understanding of the term «electronics». One of the main difficulties encountered by the compilers was that although according to some calculations the number of terms used in special literature on electronics exceeds 50.000, the vocabulary of the dictionary had to be restricted to only 9.000 entries. Therefore this dictionary cannot claim to be comprehensive. Its purpose is to enable a wide range of specialists in various countries to find the English, German, French, Dutch, or Russian equivalents of the principal and most up-to-date terms in the field of electronics. Most attention has been paid to quantum electronics, fibre optics, optoelectronics, integrated circuit technology, radiolocation and radionavigation, pulse technique, holography, etc.
Book Synopsis Low Frequency Scattering by : George Dassios
Download or read book Low Frequency Scattering written by George Dassios and published by Oxford University Press. This book was released on 2000 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Principles of Radar and Sonar Signal Processing by : Chevalier François Le
Download or read book Principles of Radar and Sonar Signal Processing written by Chevalier François Le and published by Artech House. This book was released on 2002 with total page 422 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Encyclopaedic Dictionary of Physics by : James Thewlis
Download or read book Encyclopaedic Dictionary of Physics written by James Thewlis and published by . This book was released on 1964 with total page 1022 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Building Wireless Community Networks by : Rob Flickenger
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Download or read book Trade Marks Journal written by and published by . This book was released on 1997 with total page 808 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modern Radar Detection Theory by : Antonio De Maio
Download or read book Modern Radar Detection Theory written by Antonio De Maio and published by IET. This book was released on 2015-11-25 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern radar detection is the new frontier for advanced radar systems capable of operating in challenging scenarios with a plurality of interference sources, both manmade and natural. Written by top researchers and recognized leaders in the field, this is the first book to provide a comprehensive understanding of the current research trends in modern radar detection. It updates readers with the latest radar signal processing algorithms now capable with high-speed computer chips and sophisticated programs. It also includes examples and applications from real systems. This is essential reading for radar systems design engineers within aerospace companies, military radar engineers, and aerospace contractors/consultants.
Book Synopsis Scientific Canadian Mechanics' Magazine and Patent Office Record by : Canada. Patent Office
Download or read book Scientific Canadian Mechanics' Magazine and Patent Office Record written by Canada. Patent Office and published by . This book was released on 1966-03 with total page 1070 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Ultrawideband Radar by : James D. Taylor
Download or read book Advanced Ultrawideband Radar written by James D. Taylor and published by CRC Press. This book was released on 2016-12-19 with total page 494 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the latest theory, developments, and applications related to high resolution materials-penetrating sensor systems. An international team of expert researchers explains the problems and solutions for developing new techniques and applications. Subject areas include ultrawideband (UWB) signals propagation and scattering, materials-penetrating radar techniques for small object detection and imaging, biolocation using holographic techniques, tomography, medical applications, nondestructive testing methods, electronic warfare principles, through-the-wall radar propagation effects, and target identification through measuring the target return signal spectrum changes.
