Дисертації з теми "Radar de surveillance secondaire"
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Petrochilos, Nicolas. "Algorithmes de séparation de réponses de radar secondaire de surveillance." Nice, 2002. http://www.theses.fr/2002NICE5741.
Повний текст джерелаZaghloul, Sara. "Application du DCA aux Radars de Surveillances Secondaires." Electronic Thesis or Diss., Reims, 2024. http://www.theses.fr/2024REIMS017.
Повний текст джерелаThe objective of this thesis was to develop a fast algorithm to separate a mixture of Secondary Surveillance Radar (SSR) signals. This mixture may include different modes, such as Mode A/C and Mode S, which complicate the separation due to their varied formats and different coding characteristics. During this thesis, three methods were developed using a relatively discrete criterion, the Disjoint Component Analysis (DCA), which aims to separate sources based on maximizing the disjointness between them.The first is a post-processing approach that uses linear algebra to solve the problems encountered when applying the real-valued version of DCA. However, the application of this method can pose several problems, including signal loss, residual mixing, and signal dependencies. Therefore, we concluded that it was necessary to develop a method that considers SSR signals in their original complex-valued format.The second method aims to demonstrate the effectiveness of the DCA criterion for SSR signals, using an exhaustive search approach while considering signals in their complex format. This method succeeds in separating signals with a high degree of accuracy but is computationally expensive.The third proposed method optimizes the search for the minimum using a gradient descent algorithm, which significantly improves computational efficiency while maintaining similar quality of results.These algorithms were tested in simulations and compared with various algorithms from the literature, to evaluate their performance as a function of different reception parameters. Finally, they were tested on real-world data
Shea, Eric Joseph. "Air Surveillance for Smart Landing Facilities in the Small Aircraft Transportation System." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/31838.
Повний текст джерелаMaster of Science
Alsaif, Saleh. "Design and Implementation of a Secondary Surveillance Radar/Identification Friend or Foe Transceiver Card." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/14117.
Повний текст джерелаWatt, James Penn. "A Highly Abstracted Method of FPGA-Based Development for Secondary Surveillance Radar Transpond Detection." DigitalCommons@CalPoly, 2009. https://digitalcommons.calpoly.edu/theses/148.
Повний текст джерелаNeemat, Sharef. "Design and implementation of a digital real-time secondary surveillance radar/identification friend or foe target emulator." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/12213.
Повний текст джерелаIncludes bibliographical references (p.121-122).
A real live test involving such a large number of targets would be extremely expensive, and difficult to repeat. There is thus a need for specialized target emulators to be developed and used as laboratory test equipment. This thesis describes the design and implementation of a transistor-transistorlogic (TTL) real-time SSRlIFF target emulator.
Miklíček, Marek. "Monitorování technického stavu částí radarových systémů." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2017. http://www.nusl.cz/ntk/nusl-363890.
Повний текст джерелаŠíblová, Kamila. "Možnosti využití ADS-B pro řízení provozu v CTR a po ploše." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232097.
Повний текст джерелаPecen, Vojtěch. "Výkonové zesilovače v pevné fázi pro pásmo L." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-316425.
Повний текст джерелаDrápal, Stanislav. "Využití SSR módu S pro řízení pohybů letadel a vozidel po ploše letiště." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-232018.
Повний текст джерелаKothe, Martin. "Object Recognition with Surveillance Radar Systems." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:kon4-opus-1161.
Повний текст джерелаWortham, Cody. "Space-Time Processing for Ground Surveillance Radar." Thesis, Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14468.
Повний текст джерелаManzoni, Vieira Fábio. "Fusion de données AIS et radar pour la surveillance maritime." Thesis, Toulouse, ISAE, 2017. http://www.theses.fr/2017ESAE0034/document.
Повний текст джерелаIn the maritime surveillance domain, cooperative identification and positioning systems such as AIS (Automatic Identification System) are often coupled with non-cooperative systems for ship observation such as Synthetic Aperture Radar (SAR). In this context, the fusion of AIS and Radar data can improve the detection of certain vessels and possible identify some maritime surveillance scenarios. The first chapter introduces both AIS and Radar systems, details the data structure as well as the related signal processing. The second chapter presents the potential contribution of the joint use of raw Radar and AIS data for the detection of vessels using a generalized likelihood ratio test (GLRT). Although the performance is encouraging, in practice the implementation in real-time of the detector seems complicated. As alternative, the third chapter presents a suboptimal detection method that explores Radar raw data and a positioning map of vessels obtained from the AIS system. Differently from chapter two, in addition to the simultaneous detection by both AIS and radar, the cases where only one of the systems detects an object can now be distinguished. The problem is formalized by two successive binary hypotheses test. The results suggests that the proposed detector is less sensitive to the proximity and density of ships than a conventional radar detector. The fourth chapter presents the simulator developed to test the algorithms on different surveillance scenarios, namely a civilian ship piracy scenario, an illegal cargo transhipment and a scenario of navigation in a dense environment
Binonwangan, Martian. "Space-time adaptive processing for airborne surveillance radar systems." Thesis, University of Hawaii at Manoa, 2003. http://hdl.handle.net/10125/7019.
Повний текст джерелаxx, 169 leaves
Meslot, Vincent. "Enhancing radar maritime surveillance in coastal areas using DTM." Thesis, KTH, Signalbehandling, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-140432.
Повний текст джерелаRoy, Arunesh. "Fusion of Video and Doppler Radar for Traffic Surveillance." Wright State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=wright1278910506.
Повний текст джерелаLinder, Martin, and Tobias Nylin. "Pricing of radar data." Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-104020.
Повний текст джерелаCraigie, Kyle M. "Assessment of atmospheric influence on surveillance radar performance in littoral zones." Thesis, Monterey, California. Naval Postgraduate School, 1993. http://hdl.handle.net/10945/25704.
Повний текст джерелаGale, Nicholas C. "FUSION OF VIDEO AND MULTI-WAVEFORM FMCW RADAR FOR TRAFFIC SURVEILLANCE." Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1315857639.
Повний текст джерелаPINEAU, ANNE. "La tomodensitometrie hepatique dans la surveillance du traitement des hemochromatoses secondaires : a propos de huit dossiers." Saint-Etienne, 1990. http://www.theses.fr/1990STET6408.
Повний текст джерелаKingston, Derek Bastian. "Decentralized control of multiple UAVs for perimeter and target surveillance /." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd2057.pdf.
Повний текст джерелаMangini, Geoffroy. "Étude d'un radar cohérent fonctionnant en mode pulsé : application à la surveillance maritime." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20004/document.
Повний текст джерелаMaritime sector needs are oriented to surveillance and security which concern human safety, environmental protection or fight against illegal traffic and terrorism. Among the technologies developed to perform this function known as the Vessel Traffic Service (VTS), the radar remains a major solution enabling real-time target localization, and detecting all surrounding obstacles even in limited vision conditions. However, conventional radars are unable to detect small targets in the presence of strong clutter. The coherent radar presents a solution to improve the detection thanks to his solid state architecture, conserving the phase information of the signal from emission to reception. The purpose of this thesis is to design a new architecture according to this model, working in X band, and using low cost available components from telecommunications. The realization of a prototype helps to check the architecture by implementing measures to characterize channel components, and the global system check after assembly. The characterization of detection performances can be realized with emission-reception, in presence of workable targets. Thus, the radar is exposed to several kinds of targets, as car, plane, and boats to extract their Doppler information. The validation of the prototype let to consider an industrial version. For this, the miniaturization of the system is realized by the development of embedded electronic cards, providing several functions from control and processing, to X-band components used in emission and reception. The implementation of this module is also punctuated by a testing phase in maritime operational conditions
Fofie, Francis Obeng. "Model prediction of the effects of ameliorating cosmetics on the performance of airport surveillance radar and air traffic control radar beacon systems." Ohio : Ohio University, 2003. http://www.ohiolink.edu/etd/view.cgi?ohiou1175089921.
Повний текст джерелаBurchett, M. H. "An analysis of high power stripline structures." Thesis, University of Bath, 1994. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387177.
Повний текст джерелаGeoffroy, Mangini. "Etude d'un radar cohérent fonctionnant en mode pulsé : application à la surveillance maritime." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-00803212.
Повний текст джерелаBras, Johan J. "A simulation of the single scan accuracy of a two-dimensional pulsed surveillance radar." Master's thesis, University of Cape Town, 1991. http://hdl.handle.net/11427/8460.
Повний текст джерелаThe following dissertation considers the single-scan two-dimensional positional accuracy of a pulsed surveillance radar. The theoretical aspects to the positional accuracy are considered and a generalized analytical approach is presented. Practical position estimators are often complex, and theoretical predictions of their performance generally yield unfriendly mathematical equations. In order to evaluate the performance of these estimators, a simulation method is described based on replicating the received video signal. The accuracy of such a simulation is determined largely by the accuracy of the models applied, and these are considered in detail. Different azimuth estimation techniques are described, and their performances are evaluated with the aid of the signal simulation. The best azimuth accuracy performance is obtained with the class of analogue processing estimators, but they are found to be more susceptible to interference than their binary processing counterparts. The class of binary processing estimators offer easily implemented techniques which are relatively insensitive to radar cross-section scintillation characteristics. A hybrid estimator, using both analogue and binary processing, is also evaluated and found to give an improved accuracy performance over the binary processing method while still maintaining the relative insensitivity to radar cross-section fluctuation.
Yang, Wu. "Traffic Surveillance Using Low Cost Continuous Wave (CW) Doppler Radars." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1347404224.
Повний текст джерелаAmrouche, Morad. "La surveillance et le maintien de la discipline dans l'enseignement secondaire public : des maîtres d'études du 19ème siècle aux dispositifs d'aujourd'hui : une fonction problématique." Thesis, Paris 8, 2015. http://www.theses.fr/2015PA080044.
Повний текст джерелаOur thesis questions the way surveillance and order are maintained in secondary public schools, but also the reasons why supervising positions have remained under looked. Why these latter, singular and essential, are not valued and a real career path? Undeniably, the surveillance position and maintenance of discipline have changed along the way. But what kind of changes ? To what operating mechanisms and educational goals do they respond to ? What impact do they have on current supervisors professional behavior? To answer that, this thesis has a socio-historic approach with institutional Analysis as conceptual and theoretical framework. The identification and analysis of developments on the supervision and maintenance of discipline show that they have experienced regressions but also unprecedented innovations. In the 19th century, secondary education was based on boarding schools, in which surveillance and maintenance of discipline was the cornerstone even though their educational skills and the repressive and coercive vertical disciplinary regime they embodied was being decried. Attempts at their revaluation sought the removal of "dualism" between the surveillance function and teaching staff. The reform from the Ribot commission achieved this reunion but the position and maintenance of discipline were unqualified. Yet, in the 20th century, convinced that the future of this position will not be through teaching, surveillance and maintenance of discipline will enter education inspired by methods from New Education, where the disciplinary framework is a self-government. However, against conservatism but also because of the antagonistic coexistence of a vertical disciplinary power by adults and transversal by students, experiences in this area will remain unsuccessful. The current position is part of social support that responds to a "suffering" while paradoxically emerge within the school institution coercive systems involving institutions whose professional practices join those of supervisors. It is indeed social control, especially since the concept of fighting violence and insecurity has taken over maintenance of discipline. Thus, the interest of our thesis is to shine a light on the evolving state of surveillance and maintenance of discipline so that their functional logic, education purposes and matter of their right place and role are made intelligible
Lacombe, François. "Suivi des patients traités par amiodarone : élaboration d'un carnet de surveillance thérapeutique et biologique." Paris 5, 1993. http://www.theses.fr/1993PA05P113.
Повний текст джерелаAnghel, Andrei. "Analyse temps-frequence et traitement des signaux RSO à haute résolution spatiale pour la surveillance des grands ouvrages d'art." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAT107/document.
Повний текст джерелаThe thesis is composed of two research axis. The first one consists in proposing time-frequency signal processing tools for frequency modulated continuous wave (FMCW) radars used for displacements measurements, while the second one consists in designing a spaceborne synthetic aperture radar (SAR) signal processing methodology for infrastructure monitoring when an external point cloud of the envisaged structure is available. In the first part of the thesis, we propose our solutions to the nonlinearity problem of an X-band FMCW radar designed for millimetric displacement measurements of short-range targets. The nonlinear tuning curve of the voltage controlled oscillator from the transceiver can cause a dramatic resolution degradation for wideband sweeps. To mitigate this shortcoming, we have developed two time warping-based methods adapted to wideband nonlinearities: one estimates the nonlinear terms using the high order ambiguity function, while the other is an autofocus approach which exploits the spectral concentration of the beat signal. Onwards, as the core of the thesis, we propose a novel method for scattering centers detection and tracking in spaceborne SAR images adapted to infrastructure monitoring applications. The method is based on refocusing each SAR image on a provided 3D point cloud of the envisaged infrastructure and identifying the reliable scatterers to be monitored by means of four dimensional (4D) tomography. The refocusing algorithm is compatible with stripmap, spotlight and sliding spotlight SAR images and consists of an azimuth defocusing followed by a modified back-projection algorithm on the given set of points which exploits the time-frequency structure of the defocused azimuth signal. The scattering centers of the refocused image are detected in the 4D tomography framework by testing if the main response is at zero elevation in the local elevation-velocity spectral distribution. The mean displacement velocity is estimated from the peak response on the zero elevation axis, while the displacements time series for detected single scatterers is computed as double phase difference of complex amplitudes.Finally, we present the measurement campaigns carried out on the Puylaurent water-dam and the Chastel landslide using GPS measurements, topographic surveys and laser scans to generate the point clouds of the two structures. The comparison between in-situ data and the results obtained by combining TerraSAR-X data with the generated point clouds validate the developed SAR signal processing chain
Teza cuprinde două axe principale de cercetare. Prima axă abordează aspecte metodologice de prelucraretimp-frecvenţă a semnalelor furnizate de radare cu emisie continuă şi modulaţie de frecvenţă (FMCW)în contextul măsurării deplasărilor milimetrice. În cadrul celei de-a doua axe, este proiectată şi validatăo metodă de prelucrare a imaginilor satelitare SAR (radar cu apertură sintetică) ce este destinatămonitorizării infrastructurii critice şi care se bazează pe existenţa unui model 3D al structurii respective.În prima parte a tezei, sunt investigate soluţii de corecţie a neliniarităţii unui radar FMCW în bandaX destinat măsurării deplasărilor milimetrice. Caracteristica de comandă neliniară a oscilatorului debandă largă determină o degradare a rezoluţiei în distanţă. Pentru a rezolva acest inconvenient, au fostelaborate două metode de corecţie a neliniarităţii, adaptate pentru semnale de bandă largă, ce se bazeazăpe conceptul de reeşantionare neuniformă sau deformare a axei temporare. Prima abordare estimeazăparametrii neliniarităţii utilizând funcţii de ambiguitate de ordin superior, iar cea de-a doua exploateazăo măsură de concentraţie spectrală a semnalului de bătăi într-un algoritm de autofocalizare în distanţă.În a doua parte a lucrării, este propusă o metodologie generală de detecţie şi monitorizare a centrilorde împrăştiere în imagini SAR în scopul monitorizării elementelor de infrastructură critică. Metoda sebazează pe refocalizarea fiecărei imagini radar pe un model 3D al structurii investigate în scopul identificăriicentrilor de împrăştiere pertinenţi (ţinte fiabile ce pot fi monitorizate în timp) cu ajutorul tomografiei SAR4D (distanţă-azimut-elevaţie-viteză de deplasare). Algoritmul de refocalizare este compatibil cu imaginiSAR achiziţionate în moduri diferite (« stripmap », « spotlight » şi « sliding spotlight ») şi constă într-odefocalizare în azimut urmată de o retroproiecţie modificată (condiţionată de structura timp-frecvenţă asemnalului) pe modelul 3D al structurii. Ţintele sunt identificate în stiva de imagini refocalizate cu ajutorultomografiei 4D prin efectuarea unui test de conformitate cu ipoteza că centrii de împrăştiere pertinenţivor avea elevaţie zero în planul local elevaţie-viteză. Viteza medie de deformare corespunde maximuluide pe axa de elevaţie nulă, iar seria temporară a deplasărilor se obţine printr-o dublă diferenţă de fază aamplitudinilor complexe corespunzătoare ţintelor identificate.În final sunt prezentate campaniile de măsurători pe teren efectuate la un baraj şi o alunecare de terendin regiunea Puylaurent (Franţa) destinate obţinerii modelului 3D al celor două elemente de infrastructurăprin măsurători GPS, topografice şi LIDAR. Comparaţia între deformările măsurate pe teren şi rezultateleobţinute prin combinarea imaginilor SAR cu modelele 3D au permis validarea metodologiei propuse
Hickey, Kenneth J. "Ocean surface current estimation using a long-range, single-station, high-frequency ground wave radar." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0008/MQ42394.pdf.
Повний текст джерелаPétillot, Ivan. "Combinaison d'informations hétérogènes : intégration d'images RSO pour la surveillance des glaciers alpins." Chambéry, 2008. http://www.theses.fr/2008CHAMS058.
Повний текст джерелаThis thesis deals with information processing in remote sensing. We focus our interest on the issue of registration of two images with different geometries : SAR (Synthetic Aperture Radar) images and geocoded images. This work is in the context of alpine glaciers observation and contributes to the development of methods performed in the framework of the MEGATOR and EFIDIR national projects (ANR). In the first chapter, we present the different techniques used for observing glaciers, and the expected measurements. The second chapter addresses the problem of combination of various information collected on glaciers and presents a state of the art on information merging from remote sensing data applied to glacier monitoring. In the third chapter, we propose a registration method for geo-data to SAR data. This method is based on a simulated SAR image and on the processing of coordinates images that represent the transition from one geometry to another. We present the details of this method, some results and a performance assessment. The fourth chapter deals with applications implemented with the help of such a method and dedicated to alpine glaciers monitoring
Enderli, Cyrille. "Classification par filtrage de volterra optimal pour la déflexion. Application à l'identification de données radar." Aix-Marseille 3, 2006. http://www.theses.fr/2006AIX30016.
Повний текст джерелаA major challenge for modern airborne Radars is the ability to automatically identify the received signals while having strong computation time limitations. An additional constraint consists in unclassifying those signals whose class has not been previously described in the learning data base. In this thesis, the classification problem is dealt with by using a non-linear filter model and maximizing a criterion of separability between two classes. This approach is applied to classification of pairs of classes with synthetic and real data. Extension to classification of more than two classes is then considered. Validation of the method is carried out by classifying both air/air Radar signals and SAR images. It is shown that the method is time inexpensive, allows to handle rejection of unlearned classes and may assign several classes to data that is difficult to classify
Martinet, Ludovic. "Algorithme de poursuite multihypothèse à arborescence réduite adaptée à la veille radar." Nice, 1997. http://www.theses.fr/1997NICE5095.
Повний текст джерелаAmrouche, Morad. "La surveillance et le maintien de la discipline dans l'enseignement secondaire public : des maîtres d'études du 19ème siècle aux dispositifs d'aujourd'hui : une fonction problématique." Electronic Thesis or Diss., Paris 8, 2015. http://www.theses.fr/2015PA080044.
Повний текст джерелаOur thesis questions the way surveillance and order are maintained in secondary public schools, but also the reasons why supervising positions have remained under looked. Why these latter, singular and essential, are not valued and a real career path? Undeniably, the surveillance position and maintenance of discipline have changed along the way. But what kind of changes ? To what operating mechanisms and educational goals do they respond to ? What impact do they have on current supervisors professional behavior? To answer that, this thesis has a socio-historic approach with institutional Analysis as conceptual and theoretical framework. The identification and analysis of developments on the supervision and maintenance of discipline show that they have experienced regressions but also unprecedented innovations. In the 19th century, secondary education was based on boarding schools, in which surveillance and maintenance of discipline was the cornerstone even though their educational skills and the repressive and coercive vertical disciplinary regime they embodied was being decried. Attempts at their revaluation sought the removal of "dualism" between the surveillance function and teaching staff. The reform from the Ribot commission achieved this reunion but the position and maintenance of discipline were unqualified. Yet, in the 20th century, convinced that the future of this position will not be through teaching, surveillance and maintenance of discipline will enter education inspired by methods from New Education, where the disciplinary framework is a self-government. However, against conservatism but also because of the antagonistic coexistence of a vertical disciplinary power by adults and transversal by students, experiences in this area will remain unsuccessful. The current position is part of social support that responds to a "suffering" while paradoxically emerge within the school institution coercive systems involving institutions whose professional practices join those of supervisors. It is indeed social control, especially since the concept of fighting violence and insecurity has taken over maintenance of discipline. Thus, the interest of our thesis is to shine a light on the evolving state of surveillance and maintenance of discipline so that their functional logic, education purposes and matter of their right place and role are made intelligible
Marié, Vincent. "Méthodes de vision et d'apprentissage profond appliquées à la surveillance maritime." Electronic Thesis or Diss., Toulon, 2021. http://www.theses.fr/2021TOUL0021.
Повний текст джерелаThis thesis deals with the various issues related to the detection of ships in a maritime surveillance context. More specifically, we are interested in the fight against the asymmetric threat by trying to establish situational awareness in a maritime environment. This involves the early detection and classification of maritime targets of different sizes, depths, shapes, textures and contrasts. Thus, this paper describes a novel deep learning based maritime situation awareness approach using various definition videos. The application context in which we are located involves processing very high definition videos (typically 4K) in near real time. This double constraint does not allow us to use current state-of-the-art methods, which is why we propose an original approach. Maritime object detection is achieved in three main steps. At first, a key region based tracking algorithm allows to, dynamically and parsimoniously, extract high-quality region proposals mainly focalized around rigid (i.e. ; potential object) locations. The latter are, further, fed into a Fast-RCNN convolutional neural network to perform objectness detection and regression of bounding rectangles positioned on ships. Finally, a mere box post-regression operation of bounding rectangles makes enables to extract the various ships present in the maritime scene. The detection of ships constituting only one of the processing steps within the framework of a complete monitoring platform, the various approaches developed have been integrated into the R&D DIAMANT project (Image Detection Adapted to Asymmetric Naval and Terrestrial Threats) aimed at completing the processing chain
Najoui, Zhour. "Prétraitement optimal des images radar et modélisation des dérives de nappes d'hydrocarbures pour l'aide à la photo-interprétation en exploration pétrolière et surveillance environnementale." Thesis, Paris Est, 2017. http://www.theses.fr/2017PESC1158/document.
Повний текст джерелаThis thesis deals with the preprocessing of radar images and their optimization for the analyzes in order to detect natural marine oil slicks (Sea surface Outbreak/SSO) as well as better determine their source location at the Sea Floor Source (SFS). We explained herein means, methods and difficulties encountered. This thesis consists of the following three distinct research axes represented by three submitted papers :1- A stochastic approach for pre-processing and improvement of C-band radar images to automatically detect oil slicks;2- A stochastic approach using a large quantity of radar images to evaluate the influence of wind speed and the different modes of the instrument (SAR) on the delectability of marine oil slicks ;3- Accurate location of the Sea Floor Source of marine hydrocarbon emissions using a new vertical drift model within the water column, applied to the northern Gulf of Mexico (southern USA).So first, we focused on the optimization of pre-processing and the improvement of C-band radar images by stochastic methods to automatically detect oil slicks. The proposed methodology includes three processing levels : preprocessing, thresholding, and binary cleaning. The first level consists of correcting the heterogeneity of the luminosity in the radar images resulting from the non-Lambertian reflection of the radar signal on the sea surface. The second level consists of a thresholding step which aims to produce dark objects as close as possible to the manually developed training data set. The third level consists of cleaning the output binary images from the noise residuals. Several preprocessing and cleaning methods have been tested and evaluated by a qualification engine that compares the objects automatically detected with the manual detection. Then, we focus in a second chapter in the evaluation of the influence of wind speed and instrument modes on the detection of oil slicks from radar images by using a stochastic approach. This study was dictated by the need to define the meteorological conditions capable for an optimal detection of oil slicks, from the radar images. The objective was to determine the wind speed range which optimizes the detection of oil slicks in all radar images using BigData and a stochastic approach. This work was also an opportunity to investigate the properties of the radar acquisition modes used in the detection of oil slicks. Thus, a 5-mode performance order is established (IW, APP, PRI, IMP and WSM) and shows that the IW (Sentinel-1) mode, with the best spatial resolution (greater than 5x20m) detects oil slicks at high wind speed. Finally, we focused on estimating the location of marine natural oil seeps sources using a new vertical drift model, applied in the Gulf of Mexico. Thus, we have developed a new method for detecting the source of oil seeps from natural sources on the seafloor according to the vertical drift model. Occurrences of oil seeps on the sea surface are generally offset from their sources on the seabed by several hundred meters or even kilometers. This deflection is dependent on the upward velocity of the oil and marine currents along the water column. In this study, the diameter of the droplets is not known to us a priori. To fill this gap, a new method called "the sources path" was applied herein that propose the Sea Floor Source taking into account the droplet size and the vertical drift within the water column before their Sea surface Outbreak (SSO).If these three studies can be taken independently of each other, they are firmly interconnected and complementary. They form a sort of process ranging from the optimization of the detection of an oil slick (the most appropriate means and tools for better detection) to the location of its source on the seafloor
Arnold-Bos, Andreas. "La surveillance maritime en imagerie radar bistatique : théorie, simulation, contribution à la détection automatique du sillage des navires." Phd thesis, Université de Bretagne occidentale - Brest, 2010. http://tel.archives-ouvertes.fr/tel-00763477.
Повний текст джерелаTorvik, B. "Investigation of non-cooperative target recognition of small and slow moving air targets in modern air defence surveillance radar." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1532017/.
Повний текст джерелаFilip-Dhaubhadel, Alexandra [Verfasser]. "L-Band Digital Aeronautical Communication System (LDACS)-Based Non-Cooperative Passive Multistatic Radar for Civil Aviation Surveillance / Alexandra Filip-Dhaubhadel." München : Verlag Dr. Hut, 2021. http://d-nb.info/1238423035/34.
Повний текст джерелаSenčuch, Daniel. "Optický radar s využitím dvouosého kamerového manipulátoru." Master's thesis, Vysoké učení technické v Brně. Fakulta informačních technologií, 2018. http://www.nusl.cz/ntk/nusl-385896.
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
Bousbih, Safa. "Synergie optique-radar pour l'estimation des états de surface continentale." Thesis, Toulouse 3, 2019. http://www.theses.fr/2019TOU30278.
Повний текст джерелаAgriculture is considered as one of the most important sectors in Tunisia on which the country's economy is predominately based. It is also important because of its contribution to food security. In the context of natural resource management, the characterization and monitoring of surface states is essential, particularly in semi-arid regions where several constraints hamper agricultural development (period of drought, conflicts over water sharing, lack of resources, overpumping of groundwater, etc.). In Tunisia, nearly 80% of available water resources are used by agriculture with limited efficiency. Here, with very limited water resources, the estimation of the surface water state is necessary to establish the appropriate decisions for a better sustainable management. In this context, remote sensing provides a fundamental database for surface observation. It is a major tool for remote sensing data acquisition.The work carried out during this thesis contributes to evaluate the potential of the new Sentinel-1 (S-1) and Sentinel-2 (S-2) satellite for the characterization of surface states, specifically soil moisture in a context of sustainable management of water and soil resources. Indeed, these new systems offer operational products with a high temporal repeatability and metric spatial resolutions allowing regular monitoring. In our context, radar data is particularly sensitive to surface conditions, specifically soil moisture, surface roughness and vegetation cover. They are unveiled as the most promising tools for accurate monitoring at the field or regional scale. This work includes two main parts that directly relate soil moisture (key variable for different processes) to irrigation first, and then to soil texture. The approach adopted combines experimental measurements with the use of different remote sensing data in synergy, modeling and mapping. The thesis is structured in three parts. The first part of this work evaluates the potential of C-band radar data for a large database. The results showed through behavioral and modeling studies that the radar signal could retrieve temporal and spatial dynamics of soil moisture on cereal plots. The second component consists of evaluating the combined use of optical and radar data in order to predict surface water conditions over vegetative cover. With a precision of about 6 vol. %, soil moisture mapping is then proposed at high spatial resolution, by inverting the Water Cloud Model (WCM), a backscattering model for vegetation cover.[...]
Sekak, Fatima. "Microwave radar techniques and dedicated signal processing for Vital Signs measurement." Thesis, Université de Lille (2018-2021), 2021. https://pepite-depot.univ-lille.fr/LIBRE/EDENGSYS/2021/2021LILUN033.pdf.
Повний текст джерелаIn the context of securing transportation systems, short-range monitoring of people's activity, in particular the driver's activity in a vehicle, is a major issue in the improvement of the driver assistance system. The application targeted in this work concerns mainly the railway domain.Respiratory and heart rates of the driver are key indicators for the evaluation of the physiological state. Conventional methods of measuring these vital signs rely on sensors operating in direct contact with the skin. Therefore, the intrusive character of these solutions is not suited for the transportation domain, especially because of the induced discomfort. In this work, a microwave radar solution operating at low power is proposed for the continuous measurement of respiratory and cardiac activity signals. In particular, physiological signals (heartbeat, mechanical movement of the rib cage) are indicators of human activity that can be detected at a distance (up to ten meters) using radiated microwave electromagnetic waves.Although the literature shows a growing interest in the development of radar techniques dedicated to the surveillance of people, there is no robust, sensitive and accurate commercial device available to date. A detailed analysis of the electrical and geometrical parameters of the radar technique is proposed in this work in order to identify the sources of uncertainties, to define the optimal parameters, to validate experimentally the proposed solution. An original signal processing, based on the cyclostationary approach, is implemented in order to extract the parameters of interest in reference or disturbed measurement environments. The proposed hardware solutions associated with an optimal signal processing allow to foresee radar architectures adapted to non-laboratory contingencies
Kazemisaber, Mohammadreza. "Clutter Removal in Single Radar Sensor Reflection Data via Digital Signal Processing." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-99874.
Повний текст джерелаBouzillé, Guillaume. "Enjeux et place des data sciences dans le champ de la réutilisation secondaire des données massives cliniques : une approche basée sur des cas d’usage." Thesis, Rennes 1, 2019. http://www.theses.fr/2019REN1B023/document.
Повний текст джерелаThe dematerialization of health data, which started several years ago, now generates na huge amount of data produced by all actors of health. These data have the characteristics of being very heterogeneous and of being produced at different scales and in different domains. Their reuse in the context of clinical research, public health or patient care involves developing appropriate approaches based on methods from data science. The aim of this thesis is to evaluate, through three use cases, what are the current issues as well as the place of data sciences regarding the reuse of massive health data. To meet this objective, the first section exposes the characteristics of health big data and the technical aspects related to their reuse. The second section presents the organizational aspects for the exploitation and sharing of health big data. The third section describes the main methodological approaches in data sciences currently applied in the field of health. Finally, the fourth section illustrates, through three use cases, the contribution of these methods in the following fields: syndromic surveillance, pharmacovigilance and clinical research. Finally, we discuss the limits and challenges of data science in the context of health big data
Repass, Lawrence M. "Optimal stationing of radar pickets and anti-ballistic missile defenders for long range surveillance and tracking (LRSandT) and ballistic missile defense (BMD) operations." Monterey California. Naval Postgraduate School, 2006. http://hdl.handle.net/10945/10158.
Повний текст джерелаKhan, Kamran. "Refractive conditions in Arabian Sea and their effects on ESM and airborne radar operations." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA238273.
Повний текст джерелаThesis Advisor(s): Davidson, Kenneth L. ; Powell, James R. "September 1990." Description based on title screen as viewed on December 29, 2009. DTIC Descriptor(s): Frequency, Electronic Warfare, Aircraft, Airborne, Electronic Equipment, Microwave Equipment, Radar, Profiles, Ducts, Meteorology, Communication And Radio Systems, Refraction, Arabian Sea, Refractometers, Military Operations. DTIC Identifier(s): Radar interference, meteorological phenomena, theses. Author(s) subject terms: Refractivity, Arabian Sea refractive conditions, ESM airborne radar, airborne microwave refractometer (AMR), IREPS, EREPS. Includes bibliographical references (p. 96-97). Also available in print.
BOILLET, GERARD NADINE. "Les accidents ischemiques transitoires dans le territoire carotidien chez les sujets de moins de 65 ans : etude epidemiologique sur 46 dossiers ; bilan etiologique, prevention secondaire, surveillance." Reims, 1989. http://www.theses.fr/1989REIMM108.
Повний текст джерелаNdikumana, Emile. "Etude de la végétation à partir de nouveaux capteurs satellitaires radar." Electronic Thesis or Diss., Paris, AgroParisTech, 2018. http://www.theses.fr/2018AGPT0010.
Повний текст джерелаIn this thesis, we focus on how SAR images can be used to study vegetation. Vegetation lies at the core of human lives by providing both food and economic resources as well as participating in regulating climate. Traditionally, vegetation is classified into three categories: fields, flooded pastures, and forests. We follow this classification in our study. To tackle the first two, we chose to explore rice (in Camargue, France) since rice fields are initially flooded pastures and turn to fields when more mature. We illustrate the last category with forests in Madagascar.The aim of the first part is to provide a better understanding of the capabilities of Sentinel-1 radar images for agricultural land cover mapping through the use of deep learning techniques. We revealed that even with classical machine learning approaches (K nearest neighbors, random forest and support vector machines), good performance classification could be achieved with F-measure/Accuracy greater than 86% and Kappa coefficient better than 0.82. We found that the results of the two deep recurrent neural network (RNN)-based classifiers clearly outperformed the classical approaches.In the second part, the objective is to study the capabilities of multitemporal radar images for rice height and dry biomass retrievals using Sentinel-1 data. To do this, we train Sentinel-1 data against ground measurements with classical machine learning techniques (Multiple Linear Regression (MLR), Support Vector Regression (SVR) and Random Forest (RF)) to estimate rice height and dry biomass. The study is carried out on the same multitemporal Sentinel-1 dataset in the first part. The error of rice height estimation was 16% (7.9 cm), whereas the biomass was 18% (162 g¢m¡2) (both with Random Forest method). Such results indicate that the highly qualified Sentinel-1 radar data could be well exploited for rice biomass and height retrieval and they could be used for operational tasks.Finally, reducing carbon emissions from deforestation and degradation (REDD) requires detailed insight into how the forest biomass is measured and distributed. Studies so far haveestimated forest biomass stocks using rough assumptions and unreliable data. We aim to improve on previous approaches by using radar satellite ALOS PALSAR (25-m resolution) and optical Landsat-derived tree cover (30-m resolution) observations to estimate forest biomass stocks in Madagascar, for the years 2007-2010. The radar signal and in situ biomass were highly correlated (R2 = 0.71) and the root mean square error was 30% (for biomass ranging from 0 to 500 t/ha). Combining radar signal with optical tree cover data appears to be a promising approach for using by L-band SAR to map forest biomass (and hence carbon) over broad geographical scales