Дисертації з теми "MLT radars"
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Löhner, Andreas. "Ein Beitrag zum Verbessern der azimutalen Auflösung vorwärtsschauender Radarsysteme mit synthetischer Apertur /." Düsseldorf : VDI-Verl, 1999. http://www.gbv.de/dms/bs/toc/300868324.pdf.
Повний текст джерелаMittermayer, Josef. "Hochauflösende Verarbeitung von Radardaten mit synthetischer Apertur." Köln : Deutsches Zentrum für Luft- und Raumfahrt, Bibliotheks- und Informationswesen, 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=959894764.
Повний текст джерелаScheiber, Rolf. "Hochauflösende Interferometrie für Radar mit synthetischer Apertur /." Köln : DLR, Bibliotheks- und Informationswesen, 2004. http://www.gbv.de/dms/bs/toc/392658070.pdf.
Повний текст джерелаHirsch, Oliver Wolfgang. "Neue Verarbeitungsverfahren von Along-Track Interferometrie Daten eines Radars mit synthetischer Apertur." [S.l.] : [s.n.], 2002. http://deposit.ddb.de/cgi-bin/dokserv?idn=965273024.
Повний текст джерелаSchütz, Martin [Verfasser]. "Systemkomponenten zur simultanen Radar-Ortung und Radar-Bildgebung mit autonomen Robotern und Fluggeräten / Martin Schütz." München : Verlag Dr. Hut, 2021. http://d-nb.info/1233525492/34.
Повний текст джерелаRamminger, Gernot. "Erfassung von Sturmschäden mit Hilfe moderner Radar-Fernerkundungssystemen." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11513767.
Повний текст джерелаBenahmed, Daho Omar. "Radar ULB pour la vision à travers les murs : mise au point d'une chaîne de traitement de l'information d'un radar imageur." Thesis, La Rochelle, 2014. http://www.theses.fr/2014LAROS036/document.
Повний текст джерелаThis report is focused on Through-the-wall surveillance (TTS) using UWB radar, with the objective of developing a complete information processing pipeline (IPP) which can be used by different types of imaging radar. To do this, we want to take into account any a priori information, nor on the target, or their environmental context. In addition, the IPP must meet criteria of adaptability and modularity to process information from two types of radar, including pulsed and FMCW developed in two projects that are part of the work of this thesis. Radar imaging is an important point in this context ; we approach it by combining backprojection and trilateration algorithms and show the improvement with the use of a CFAR detector taking into account the shape of the targets signatures.The development of the IPP is our main contribution. The flow of radar images obtained is divided into two parts. The first dynamic sequence contains moving targets are tracked by a multiple hypothesis approach. The second static sequence contains stationary targets and interior walls that are highlighted by Radon transformbases approach. We developed a simulator operating in time and frequency domain to design the algorithms of the IPP and test their robustness. Several simulated scenarios and experimental measurements show that our IPP is relevant and robust. It is thus validated for both radar systems
Castaings, Thibaut. "Catalogage de petits débris spatiaux en orbite basse par observations radars isolées." Phd thesis, Grenoble, 2014. http://tel.archives-ouvertes.fr/tel-00955486.
Повний текст джерелаAraújo, Luciana Rodrigues de. "Comportamento dinâmico da região MLT tropical durante o Ciclo Solar 23." Universidade Estadual da Paraíba, 2017. http://tede.bc.uepb.edu.br/jspui/handle/tede/3117.
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Made available in DSpace on 2018-06-18T18:12:06Z (GMT). No. of bitstreams: 1 PDF - Luciana Rodrigues de Araújo.pdf: 65021055 bytes, checksum: ca14397fd5976fb51f30eb8b9769c237 (MD5) Previous issue date: 2017-02-17
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Wind data obtained between 1999 and 2016 from measuments by meteor radar at Cachoeira Paulista (22.7°S, 45.0°W), Brazil, were used to investigate the behavior of the dynamics on upper mesosphere and lower thermosphere region, the interannual variability in the winds, in the diurnal tide and 2-day wave amplitudes and the possible causes. The results show that zonal wind is characterized by a semiannual variation below 90 km and annual above, while the meridional wind exhibits an annual cycle at all altitudes. Monthly winds did not show quasi-biennial variation (QBO), however the seasonal winds in the zonal direction observed during the summer and fall show QBO variations type in altitudes below 90 km. The results also suggest that the zonal and meridional winds are intensified during the years of solar maximum, especially in the summer and winter seasons. The monthly amplitudes of diurnal tide show an annual variation, in which the amplitudes are greater during the eastward phase of QBO at 30 hPa. The spectrum obtained from the deseasonalized amplitudes shows a 26 months peak in the meridional component, which may to be associated with stratospheric QBO phase. The modulation of the diurnal tide amplitude by QBO shows a quasi ten-year variation, and is stronger for the solar cycle maximum. The amplitude of the 2-day wave exhibit interannual variability, however, do not shows to be affected by the QBO phase during the summer season. The amplitudes of the 2-day show interannual variability, but, only in winter it is affected by the QBO phase. Good agreement between the variation of the amplitude of the 2-day wave for meridional wind and the solar radio flux was observed for most of the summers with a significant correlation, suggesting a possible wave modulation by the 11-year solar cycle.
Dados de ventos obtidos entre 1999 e 2016 a partir de medidas por radar meteórico em Cachoeira Paulista (22,7°S, 45,0°O), Brasil, foram utilizados para investigar o comportamento da dinâmica da região da alta mesosfera e baixa termosfera, a variabilidade interanual dos ventos, das amplitudes da maré diurna e da onda de 2 dias e as possíveis causas. Os resultados mostram que o vento zonal é caracterizado por uma variação semianual abaixo de 90 km e anual acima, enquanto o vento meridional exibe um ciclo anual em todas as alturas. Os ventos mensais não mostraram variação quase bienal (QBO), contudo os ventos sazonais na direção zonal observados durante o verão e o outono mostram variações tipo QBO nas alturas abaixo de 90 km. Os resultados sugerem ainda que os ventos zonal e meridional são intensificados durante os anos de máxima atividade solar, principalmente nas estações de verão e inverno. As amplitudes mensais da maré diurna exibem variação interanual, em que as amplitudes são maiores durante a fase para leste da QBO em 30 hPa. O espectro obtido a partir das amplitudes dessazonalizadas mostra um pico próximo de 26 meses na componente meridional, o qual pode estar associado à fase da QBO estratosférica. A modulação da amplitude da maré diurna pela QBO mostra uma variação quase decenal, e é mais forte durante o máximo do ciclo solar. As amplitudes da onda de 2 dias exibem variabilidade interanual para ambas as componentes, contudo, apenas no inverno mostra ser afetada pela fase da QBO. Boa concordância entre a variação da amplitude meridional da onda de 2 dias e o fluxo de rádio solar foi observada para a maioria dos verões com correlação significativa, sugerindo uma possível modulação da onda pelo ciclo solar de 11 anos.
Schmid, Hermann Wilhelm. "Hagelvorhersage mit Radar : wolkenphysikalische Untersuchungen und ein statistisches Vorhersagemodell /." [S.l.] : [s.n.], 1988. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8684.
Повний текст джерелаRamminger, Gernot. "Erfassung von Sturmschäden mit Hilfe von modernen Radar-Fernerkundungssystemen." [S.l. : s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973169303.
Повний текст джерелаDallinger, Alexander. "Zirkulares synthetisches Apertur-Radar zur Personenkontrolle mit Millimeter-Wellen." Berlin Logos, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=3066065&prov=M&dok_var=1&dok_ext=htm.
Повний текст джерелаWinkler, Volker. "Automobiler Radarsensor mit integrierter Kommunikationsfunktion." Berlin Logos-Verl, 2006. http://deposit.ddb.de/cgi-bin/dokserv?id=2827573&prov=M&dok_var=1&dok_ext=htm.
Повний текст джерелаReichthalhammer, Thomas [Verfasser]. "Ein Radar mit synthetischer Apertur für den Nahbereich / Thomas Reichthalhammer." München : Verlag Dr. Hut, 2012. http://d-nb.info/1022535390/34.
Повний текст джерелаVasudevan, Santhosh. "HURRICANE WIND RETRIEVAL ALGORITHM DEVELOPMENT FOR AN AIRBORNE CONICAL SCANNING SCATTEROMETER." Master's thesis, University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3222.
Повний текст джерелаM.S.
School of Electrical Engineering and Computer Science
Engineering and Computer Science
Electrical Engineering
Vagnoni, Cristina. "Algorithms for the computation of the joint spectral radius." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425106.
Повний текст джерелаKeil, Christian. "Numerische Simulation von Starkniederschlagsereignissen mit mesoskaligen Wettervorhersagemodellen : Überprüfung mit Radar-Daten und Diagnose der atmosphärischen Wasserbilanz /." Köln : Deutsches Zentrum für Luft- und Raumfahrt, Bibliotheks- und Informationswesen, 2000. http://deposit.ddb.de/cgi-bin/dokserv?idn=960293620.
Повний текст джерелаBauer-Pfundstein, Matthias [Verfasser]. "Bestimmung von Turbulenzparametern und der Schallabsorption mit einem Wind-Temperatur-RADAR / Matthias Bauer-Pfundstein." Karlsruhe : KIT-Bibliothek, 1999. http://d-nb.info/1198223731/34.
Повний текст джерелаBlahak, Ulrich. "Analyse des Extinktionseffektes bei Niederschlagsmessungen mit einem C-Band-Radar anhand von Simulation und Messung /." Karlsruhe : Institut für Meteorologie und Klimaforschung Universität Karlsruhe (TH), 2005. http://swbplus.bsz-bw.de/bsz116418370abs.htm.
Повний текст джерелаBachmann, Timo. "Osteometische Typisierung des Radius von rezenten Mitteleuropäern mit Hilfe künstlicher neuronaler Netze." Aachen Mainz, 2009. http://d-nb.info/1000339610/04.
Повний текст джерелаSturm, Christian [Verfasser], and T. [Akademischer Betreuer] Zwick. "Gemeinsame Realisierung von Radar-Sensorik und Funkkommunikation mit OFDM-Signalen / Christian Andreas Sturm ; Betreuer: T. Zwick." Karlsruhe : KIT Scientific Publishing, 2012. http://d-nb.info/1184492646/34.
Повний текст джерелаWendrich, Astrid [Verfasser], and Kurt [Akademischer Betreuer] Kießl. "Zerstörungsfreie Ortung von Anomalien in historischem Mauerwerk mit Radar und Ultraschall / Astrid Wendrich ; Betreuer: Kurt Kießl." Weimar : Professur Bauklimatik, 2009. http://d-nb.info/1115342061/34.
Повний текст джерелаNasonova, Sasha. "Estimating Arctic sea ice melt pond fraction and assessing ice type separability during advanced melt." Thesis, Remote Sensing, 2017. https://dspace.library.uvic.ca//handle/1828/9313.
Повний текст джерелаGraduate
2019-03-21
Kristin, Julia. "Vorhersagekraft der Versagenslast des distalen Radius mit Mikro-Computertomographie und Zweienergie-Röntgen-Absorptiometrie." Diss., lmu, 2007. http://nbn-resolving.de/urn:nbn:de:bvb:19-75895.
Повний текст джерелаPreko, Kwasi. "Determination of Volumetric Soil Water Content Using Ground Penetrating Radar Bestimmung des volumetrischen Bodenwassergehaltes mit dem Bodenradar /." [S.l. : s.n.], 2007. http://digbib.ubka.uni-karlsruhe.de/volltexte/1000007396.
Повний текст джерелаDean, Andrew Mark. "Vegetation, topography and snow melt at the Forest-Tundra Ecotone in arctic Europe : a study using synthetic aperture radar." Thesis, Durham University, 2003. http://etheses.dur.ac.uk/4037/.
Повний текст джерелаPandolfi, Carlo. "Studio preliminare di un sistema di monitoraggio e controllo del traffico di superficie nell’area di manovra dell’aeroporto di Fiumicino." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2013. http://amslaurea.unibo.it/4850/.
Повний текст джерелаAnke, Juliane, Angela Francke, and Tibor Petzoldt. "RadVerS - Mit Smartphones generierte Verhaltensdaten im Verkehr – Differenzierung des Nutzerverhaltens unterschiedlicher RadfahrerInnengruppen : Teil I: Typologisierung von RadfahrerInnen." Technische Universität Dresden, 2021. https://publish.fid-move.qucosa.de/id/qucosa%3A76000.
Повний текст джерелаWagner, Beatrix, Monika Pilarski, Andreas Forgber, and Martin Wagner. "Der Einsatz von Fernerkundungstechnologien im Kontext mit dem Markscheidewesen und der Geotechnik - Beispiele aus der Praxis." Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2016. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-206127.
Повний текст джерелаIn this paper, it is shown how the company ILV works successfully domestically and abroad by long standing involvement in research and development projects as well as by industrial testing of innovative technologies. The focus of the paper are results of application of satellite images in visual range and of radar data as experiences with the introduction of digital airborne camera technique. Field notes about digital photo flight abroad – also from the view of the customer for geological and geotechnical problems – and about industrial testing of Multi-beam Sonar Technique show the innovative potentials of these technologies
Vollbracht, Dennis. "Design and development of phased-array antennas for dual-polarized weather radar applications." Universitätsverlag Chemnitz, 2017. https://monarch.qucosa.de/id/qucosa%3A32005.
Повний текст джерелаWetterradarsysteme mit phasengesteuerten Antennen stellen eine echte Alternative zu Wetterradarsystemen mit mechanisch drehenden Reflektorantennen dar. Dual-polarisierte phasengesteuerte Antennen müssen jedoch sehr genau in ihrem Kreuzpolarisationsverhalten verifiziert werden, um für den Wetterradarbereich von Nutzen zu sein. Die Unterdrückung der kreuzpolaren Anteile von Radarantennen ist von fundamentaler Bedeutung, um Hydrometeore mit Hilfe von polarimetrischen Wetterradarsystemen klassifizieren und qualitativ bestimmen zu können. Die hohe Anforderung an Polarisationsreinheit ist mit aktuell erhältlichen Arraydesigns nur schwierig zu realisieren, da sich die Kreuzpolarisationsunterdrückung während des elektronischen Schwenks der Hauptkeule signifikant verschlechtert. Diese Dissertation stellt ein Wetterradar Systemkonzept mit phasengesteuerter Gruppenantenne vor, welches die aktuell genutzten Wetterradare mit Reflektorantennen ablösen könnte. Der Fokus der Arbeit wurde auf die Entwicklung einer Dual-polarimetrischen, polarisationsreinen und phasengesteuerten Mikrostreifenleiterantennen gelegt. Hierbei wurden neue grafische Verfahren entwickelt, die es ermöglichen, die Generierung der kreuzpolaren Anteile von isolierten Patchantennen (Einzelpatche) zu erklären und zu minimieren. Um die kreuzpolaren Anteile weiter herabzusetzen wurden Optimierungsverfahren für Arrayantennen erforscht, bewertet und neu entwickelt. Zum ersten Mal wurden differentiell gespeiste mit einzeln gespeisten Antennenarrays in ihrem Kreuzpolarisationsverhalten während des elektronischen Schwenks der Hauptkeule verglichen. Zwei Dual- polarimetrische 4x8 Antennenarrays (differentiell gespeist und mit optimierter Phasenansteuerung) wurden zu diesem Zweck mittels CST MWS entworfen, simuliert, als Multilagenplatine gefertigt und an der Antennentestanlage der RWTH Aachen vermessen. Die Resultate zeigen, dass die Kreuzpolarisationsanteile bei differentiell gespeisten Mikrostreifenleiterantennen in Gruppenkonfiguration, selbst beim elektronischen Schwenk der Hauptkeule, signifikant minimiert werden konnten. Für einen azimutalen Scanbereich von 120_ konnte eine exzellente Kreuzpolarisationsunterdrückung zwischen -45 dB und -36 dB messtechnisch für den horizontalen und vertikalen Polarisationskanal nachgewiesen werden.
Göbell, Sibylle. "Determination of sea ice surface elevation with laser and radar altimetry and comparison with ice thickness data sets in the Arctic and Antarctic = Bestimmung der Oberflächenhöhe von Meereis mit Laser- und Radaraltimetrie und Vergleich mit Eisdickendatensätzen in der Arktis und Antarktis /." Bremerhaven : Alfred-Wegener-Institut für Polar- und Meeresforschung, 2007. http://www.loc.gov/catdir/toc/fy0803/2008365359.html.
Повний текст джерелаWendrich, Astrid [Verfasser], Kurt [Gutachter] Kießl, Werner [Gutachter] Leschnik, and Jens [Gutachter] Tronicke. "Zerstörungsfreie Ortung von Anomalien in historischem Mauerwerk mit Radar und Ultraschall - Möglichkeiten und Grenzen - / Astrid Wendrich ; Gutachter: Kurt Kießl, Werner Leschnik, Jens Tronicke." Berlin : Bundesanstalt für Materialforschung und -prüfung (BAM), 2009. http://d-nb.info/1122835787/34.
Повний текст джерелаRösch, Kerstin [Verfasser]. "Retrospektive Analyse diaphysärer und distal metaphysärer Radius/Ulna-Frakturen beim Hund nach Plattenosteosynthese und Osteosynthese mit Fixateur externe / Kerstin Rösch." Berlin : Freie Universität Berlin, 2021. http://d-nb.info/1233986821/34.
Повний текст джерелаLorenzen, Thore [Verfasser], and Andreas [Akademischer Betreuer] Plettenberg. "Therapieumstellungen bei antiretroviral vorbehandelten HIV-infizierten Patienten mit Hilfe des Expertenrat-Systems Radata Analyse des Therapieverlaufes / Thore Lorenzen. Betreuer: Andreas Plettenberg." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2012. http://d-nb.info/103036592X/34.
Повний текст джерелаLorenzen, Thore Verfasser], and Andreas [Akademischer Betreuer] [Plettenberg. "Therapieumstellungen bei antiretroviral vorbehandelten HIV-infizierten Patienten mit Hilfe des Expertenrat-Systems Radata Analyse des Therapieverlaufes / Thore Lorenzen. Betreuer: Andreas Plettenberg." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2012. http://d-nb.info/103036592X/34.
Повний текст джерелаPhruksahiran, Narathep. "Polarimetrische Streuungseigenschaften und Fokussierungsmethoden zur quantitativen Auswertung der polarimetrischen SAR-Daten." Doctoral thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-107764.
Повний текст джерелаKunz, Lukas Brad. "A New Method for Melt Detection on Antarctic Ice-Shelves and Scatterometer Calibration Verification." Diss., CLICK HERE for online access, 2004. http://contentdm.lib.byu.edu/ETD/image/etd527.pdf.
Повний текст джерелаSchulz-Wackerbarth, Cyriak Nathanael [Verfasser]. "Evaluation der Spaltlampen Spectral Radar Optischen Kohärenztomographie (SL SR OCT) und Vergleich mit SL OCT und Stratus OCT bei physiologischen und pathologischen Befunden des vorderen und hinteren Augenabschnittes / Cyriak Nathanael Schulz-Wackerbarth." Lübeck : Zentrale Hochschulbibliothek Lübeck, 2011. http://d-nb.info/1018316558/34.
Повний текст джерелаDütsch, Yvonne [Verfasser], Jan S. [Akademischer Betreuer] Bauer, Rothe Rüdiger von [Akademischer Betreuer] Eisenhart, and Simone [Akademischer Betreuer] Waldt. "Reproduzierbarkeit trabekulärer Strukturparameter des distalen Radius akquiriert mit hochauflösender Magnetresonanztomographie bei 1,5 und 3,0 Tesla / Yvonne Dütsch. Gutachter: Rüdiger von Eisenhart-Rothe ; Simone Waldt. Betreuer: Jan S. Bauer." München : Universitätsbibliothek der TU München, 2013. http://d-nb.info/1046404725/34.
Повний текст джерелаStracke, Siegbert. "Laser-Doppler-Flowmetrie bei Osteoporose : eine Untersuchung der Durchblutung des distalen Radius im Übergangsbereich von Periost zu Knochen mit Hilfe der Laser-Doppler-Flowmetrie zur Erfassung funktioneller Parameter der Mikrozirkulation /." Giessen : VVB Laufersweiler, 2007. http://d-nb.info/988006715/04.
Повний текст джерелаStracke, Siegbert [Verfasser]. "Laser-Doppler-Flowmetrie bei Osteoporose : eine Untersuchung der Durchblutung des distalen Radius im Übergangsbereich von Periost zu Knochen mit Hilfe der Laser-Doppler-Flowmetrie zur Erfassung funktioneller Parameter der Mikrozirkulation / vorgelegt von Siegbert Stracke." Giessen : VVB Laufersweiler, 2008. http://d-nb.info/988772051/34.
Повний текст джерелаNovotná, Eliška. "Porovnání české společnosti s ručením omezeným a jejího založení a vzniku s Gesellschaft mit beschrankten Haftung (GmbH) v SRN." Master's thesis, Vysoká škola ekonomická v Praze, 2011. http://www.nusl.cz/ntk/nusl-114227.
Повний текст джерелаSpargo, Andrew John. "Studies of the MLT/I using Multistatic Meteor Radar." Thesis, 2021. http://hdl.handle.net/2440/130751.
Повний текст джерелаThesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2021
Zaman, Zahra. "Stimulation eines Radar-Objekterkennungs- und Trackingverfahren mit synthetischen Daten." Master's thesis, 2020. https://tuprints.ulb.tu-darmstadt.de/13502/1/math_761-19_zahra_zaman_ho_tuprints.pdf.
Повний текст джерелаSwart, Petrus Hermanus. "Elektromagnetiese pulskompressie met behulp van versadigbare magnetiese kerne." Thesis, 2015. http://hdl.handle.net/10210/13383.
Повний текст джерелаPulse Compression is a technique that may be employed for the generation of extremely high amplitude current and voltage pulses. These pulses can be as short as 50 to 100 ns, and may have amplitudes in the kiloampere and kilovolt ranges. Pulse Compression entails the compression of relatively "flat" pulses in the time domain, to pulses of very high amplitudes and extremely short duration. The pulse amplitudes and durations necessary to be achieved in this research, lie in the range where the switching speeds and other parameters of semiconductors are inadequate and where even the working life of conventional gas discharge apparatus are drastically reduced by the extreme switching demands. The burden of excessively high current densities and unmanageable current rise-rates can be transferred from the semiconductor switches to electromagnetic switches, by making use of pulse compression. Pulse compression can be carried out simultaneously or separately for the compression of the current or voltage content of pulses derived from slowly switched sources, to obtain pulses of extremely short duration and very high amplitudes. The main theme of this dissertation is Current compression. Current compression is accomplished through series-resonance in capacitors and saturable inductors connected in a transmission-line configuration. Energy is transferred in this process from one stage to the next, with reduction in pulse-time in each successive stage and a commensurate increase in amplitude. The generated pulses can attain gigawatt amplitudes and nanosecond durations, whilst loading on the semiconducting switches remains low. In addition to design of the pulse-compressor proper, the work also includes design and development of a voltage-controlled pulse power supply, suitable for generating the initial pulses which are to be compressed. Multistage pulse compression is based on the non-linear characteristics of saturable inductors. Dynamic analogue-time simulation is indispensable in a study thereof, as new theory has to be validated and because non-linear analysis is complex and capable only of being executed by employing approximation methods. Because of the difficulties involved, a considerable amount of attention has been devoted to the development of suitable analogue-dynamic simulation programs for execution on a digital computer. A numerical technique has been developed to express non-linear parameters in differential form. This technique makes it possible to model and simulate virtually any non-linear, physically realizable lumped parameter system with ease. The program is based on State Space techniques and has been developed for its versatility, to accomplish the simulation of a wide variety of circuit configurations.
Hirsch, Oliver Wolfgang [Verfasser]. "Neue Verarbeitungsverfahren von Along-Track Interferometrie Daten eines Radars mit synthetischer Apertur / von Oliver Wolfgang Hirsch." 2002. http://d-nb.info/965273024/34.
Повний текст джерелаRamminger, Gernot [Verfasser]. "Erfassung von Sturmschäden mit Hilfe von modernen Radar-Fernerkundungssystemen / vorgelegt von Gernot Ramminger." 2004. http://d-nb.info/973169303/34.
Повний текст джерелаKeil, Christian [Verfasser]. "Numerische Simulation von Starkniederschlagsereignissen mit mesoskaligen Wettervorhersagemodellen : Überprüfung mit Radar-Daten und Diagnose der atmosphärischen Wasserbilanz / Christian Keil." 2000. http://d-nb.info/960293620/34.
Повний текст джерелаManuel, João Carlos dos Santos. "Estudo do movimento de glaciares na Antartida com interferometria radar de abertura sintética." Master's thesis, 2013. http://hdl.handle.net/10451/10270.
Повний текст джерелаO estudo da deformação de glaciares e da avaliação do derretimento dos glaciares é importante para a avaliação do impacto que os glaciares têm nas mudanças climáticas. O estudo em regiões inóspitas como a Antártida é limitado, devido ao difícil acesso que apresenta. No entanto, a Antártida é das regiões mais importantes para o estudo da deformação glaciar, pois contém importantes indicadores das mudanças climáticas. Técnicas de detecção remota, como a interferometria SAR (InSAR), facilitam este tipo de estudos. O trabalho realizado na presente dissertação consistiu em desenvolver um estudo da deformação do terreno (gelo e glaciares) em zonas consideradas inóspitas, através de interferometria diferencial SAR (DInSAR). A área em estudo corresponde à Ilha Livingston, Ilha Deception e Ilha Snow. Foi ainda realizado um segundo objectivo que consiste na criação de modelos digitais de terreno (MDT), para efeitos de criação de produtos cartográficos. Serão criados dois MDTs que cobrirão as Ilhas Livingston, Deception e Snow, e a Ilha King George, respectivamente. Para o desenvolvimento dos dois objectivos, são realizadas, então, técnicas de processamento automáticas em imagens satélite que englobam a região Antes da realização do processamento de interferometria SAR, foi gerado um MDT de referência, com uma resolução de 90 m, através da combinação de um MDT, extraído através de curvas de níveis geradas a partir de cartas da região, e um MDT fornecido pela National Snow and Ice Data Center (NSIDC). Este MDT de referência irá ter um papel importante, mais tarde, no estudo da deformação do terreno, para utilização no processamento das imagens, e para comparação com os modelos digitais de terrenos criados. O processo InSAR consiste, então, na realização das técnicas de processamento em duas imagens satélite, da mesma zona. O produto que sairá da realização dessas técnicas consistirá num interferograma. Uma vez obtido este produto, tem-se que para o estudo da deformação (técnica DInSAR), é realizada a subtracção automática do MDT de referência com o interferograma, gerando um interferograma diferencial. Este interferograma diferencial respresenta a deformação do terreno. No estudo de deformação, foram processados 14 interferogramas, compreendidos entre os períodos de 1993 e 2000. A análise efectuada é dividida por três trajectos, e dentro desses trajectos em várias regiões. Esta análise é realizada de uma forma subjectiva, ou seja, através da contagem do padrão de franjas nos interferogramas, e assumindo, através deste padrão, uma dada taxa velocidade de derretimento glaciar. A análise prova que existe uma elevada actividade glaciar na região, e que a qualidade dos resultados no estudo da deformação dos glaciares tem a influência de vários factores. Para a criação do MDT, foram estimadas as altitudes, e realizada a comparação do MDT interferométrico com o MDT de referência, para efeitos de validação, para a região da Ilha de Livingston, Deception, e Snow. No entanto, para o MDT da Ilha King George, visto não haver um MDT de referência, foi apenas exposto o resultado e realizada uma análise subjectiva.
The study of deformation and the evaluation of glacier melting are important to the assessment of the impact that the glaciers have on climate change. This type of study in remote regions like Antarctica is limited, due to the difficult access. However, Antarctica is one of the most important regions for the study of glacier deformation, as it contains important climate change indicators. Remote sensing techniques, such as interferometry SAR (InSAR rivers), facilitate this type of studies. The work being done in the present thesis consisted on developing a study of ground deformation (ice and glaciers) in areas considered inhospitable by differential interferometry (DInSAR). The study area covers Livingston Island, Deception Island and Snow Island. It was also accomplished a second objective that consists in the creation of digital terrain models (DTM), for the purposes of creation of cartographic products. It will be created two DTMs which will cover the Islands of Livingston, Deception and Snow, and the King George Island, respectively. For the development of the two objectives, it was done automatic processing techniques in satellite images that cover the region. Prior to the completion of processing of SAR interferometry, reference MDT was created, with a resolution of 90 m, trough the combination of a DTM, extracted from contours generated from region maps, and an DTM provided by the National Snow and Ice Data Center (NSIDC). This reference DTM will play an important role later on, in the study of the deformation, for use in the image processing, and for comparison with digital terrain models created. The InSAR process consists, therefore, in carrying out processing techniques in two satellite images, of the same area. The product that comes out of the realization of these techniques will be an interferogram. Once obtained this product, for the study of deformation (DInSAR), an automatic subtraction is performed between the reference DTM and the interferogram, generating a differential interferogram. This differential interferograma represents ground deformation. In the study of deformation, 14 interferograms were processed, between 1993 and 2000 periods. The analysis is divided by three tracks, and within these tracks in various regions. This analysis is performed in subjective way, i.e. by counting the fringe pattern in interferograms, and assuming a melting glacier velocity rate, through this pattern. The analysis proves that there is high glacial activity in the region, and that the quality of results in the study of deformation of glaciers had the influence of several factors. For the creation of MDT, the altitudes were estimated, and a comparison was held between the DTM InSAR created and the reference DTM, for purposes of validation, for the region of Livingston Island, Deception, and Snow. However, for MDT the island King George, since there is no reference DTM, only the result was exposed and subjective analysis was held.
Alibakhshikenari, M., B. S. Virdee, C. H. See, Raed A. Abd-Alhameed, F. Falcone, and E. Limiti. "Surface wave reduction in antenna arrays using metasurface inclusion for MIMO and SAR systems." 2019. http://hdl.handle.net/10454/18126.
Повний текст джерелаAn effective method is presented for suppressing mutual coupling between adjacent radiating elements which is based on metasurface isolation for MIMO and synthetic aperture radar (SAR) systems. This is achieved by choking surface current waves induced over the patch antenna by inserting a cross-shaped metasurface structure between the radiating elements. Each arm of the cross-shaped structure constituting the metasurface is etched with meander-line slot (MLS). Effectiveness of the metasurface is demonstrated for a2×2antenna array that operates over six frequency sub-bands in X, Ku and K-bands. With the proposed technique, the maximum improvement achieved in attenuating mutual coupling between neighbouring antennas is: 8.5 dB (8-8.4 GHz), 28 dB (9.6-10.8 GHz), 27 dB (11.7-12.6 GHz), 7.5 dB (13.4-14.2 GHz), 13 dB (16.5-16.8 GHz) and 22.5 dB (18.5-20.3 GHz). Furthermore, with the proposed technique (i) minimum center-to-center separation between the radiating elements can be reduced to 0.26λ0, where λ0 is 8.0 GHz; (ii) use of ground-plane or defected ground structures are unnecessary; (iii) use of short-circuited via-holes are avoided; (iv) it eliminates the issue with poor front-to-back ratio; and (v) it can be applied to existing arrays retrospectively.
H2020-MSCA-ITN-2016 SECRET-722424 and the financial support from the UK Engineering and Physical Sciences Research Council (EPSRC) under grant EP/E0/22936/1