Дисертації з теми "GNSS data"
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Ortolani, Alberto <1969>. "Probabilistic tomography of atmospheric parameters from GNSS data." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3922/1/ortolani_alberto_tesi.pdf.
Повний текст джерелаOrtolani, Alberto <1969>. "Probabilistic tomography of atmospheric parameters from GNSS data." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2011. http://amsdottorato.unibo.it/3922/.
Повний текст джерелаBertani, Federico. "Reconstruction of vehicle dynamics from inertial and GNSS data." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2018. http://amslaurea.unibo.it/16105/.
Повний текст джерелаHorn, Matti. "En analys av webbtjänster för bearbetning av GNSS-data." Thesis, KTH, Geoinformatik och Geodesi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-46743.
Повний текст джерелаRomano, Vincenzo. "Ionospheric scintillation effects on GNSS : monitoring and data treatment development." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33909/.
Повний текст джерелаKhodabandeh, Amir. "Precise multi-GNSS point positioning: theory, algorithm and data analysis." Thesis, Curtin University, 2015. http://hdl.handle.net/20.500.11937/159.
Повний текст джерелаYan, Thomas Surya Sanjaya Surveying & Spatial Information Systems Faculty of Engineering UNSW. "Analysis on distribution of real-time GNSS data over IP networks." Publisher:University of New South Wales. Surveying & Spatial Information Systems, 2008. http://handle.unsw.edu.au/1959.4/41286.
Повний текст джерелаPolezel, Wesley Gildo Canducci [UNESP]. "Investigações sobre o impacto da modernização do GNSS no Posicionamento." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/86810.
Повний текст джерелаCom a inclusão de novos sinais nos satélites GPS e o advento do sistema Galileo, o posicionamento por satélite entrará em uma nova era, trazendo inovações tecnológicas e científicas, principalmente nas combinações entre diferentes sistemas. Logo, verifica-se a importância de analisar a qualidade dos novos sinais, quantificando suas contribuições na acurácia do posicionamento. Visando contribuir com essa demanda, este trabalho tem o intuito de dar continuidade às pesquisas no Brasil sobre a qualidade advinda da modernização do GNSS utilizando os novos sinais transmitidos pelos satélites. O GNSS engloba o GPS, o GLONASS, o Galileo, o SBAS, o Beidou e o LAAS. Entretanto, neste trabalho apenas os sistemas GPS, GLONASS e Galileo serão abordados. Com esses três sistemas é possível realizar combinações lineares para integrá-los no posicionamento por ponto e relativo. Alguns problemas nessa combinação foram detectados com indicações de soluções para os efeitos não modelados. No que concerne aos efeitos da ionosfera, uma combinação ion-free utilizando três freqüências foi apresentada, permitindo eliminar os efeitos de primeira e segunda ordem da ionosfera. Apresenta-se também uma revisão bibliográfica do estado da arte da solução da ambigüidade utilizando esses três sistemas. Além disso, foi realizado um experimento a fim de analisar a qualidade do novo sinal L2C. Nas análises, tal como esperado, os satélites modernizados apresentaram melhores resultados do que os satélites não modernizados. Como o sistema Galileo ainda não está operacional, foi implementado no software GPSeq a interoperabilidade dos sinais GPS e GLONASS e realizadas análises comparando tais sistemas no posicionamento relativo. Além disso, comparou-se os resultados do software GPSeq com softwares comerciais. Os resultados, em alguns momento...
With the addition of new signals in GPS satellites and the advent of Galileo system, the satellite positioning will start a new era, which will require technologic and scientific innovations mainly in combinations of these systems. Therefore, analyzing the new signal quality and quantifying their contribution in the positioning accuracy are very important. Thus, this research points out the importance of continuing investigations in Brazil about GNSS modernization using the new signals transmitted by the satellites. The GNSS include GPS, GLONASS, Galileo, SBAS, Beidou and LAAS. However, in this work only GPS, GLONASS and Galileo system are taken into account. In order to integrate these three systems it is possible to accomplish linear combinations in absolute and relative positioning. Some problems in these combinations were detected and solutions for the unmodeled effects were recommended. For the ionospheric effect, an ion-free combination using three frequencies was performed. This combination can eliminate the ionosphere effects of first and second order. In this paper a bibliographical revision of the ambiguity solution using three systems is accomplished. Furthermore, an experiment was carried out to analyze... (Complete abstract click electronic access below)
Takahashi, Atsushi. "Hierarchical Cluster Analysis of Dense GNSS Data and Interpretation of Cluster Characteristics." Kyoto University, 2019. http://hdl.handle.net/2433/244510.
Повний текст джерелаPolezel, Wesley Gildo Canducci. "Investigações sobre o impacto da modernização do GNSS no Posicionamento /." Presidente Prudente : [s.n.], 2010. http://hdl.handle.net/11449/86810.
Повний текст джерелаAbstract: With the addition of new signals in GPS satellites and the advent of Galileo system, the satellite positioning will start a new era, which will require technologic and scientific innovations mainly in combinations of these systems. Therefore, analyzing the new signal quality and quantifying their contribution in the positioning accuracy are very important. Thus, this research points out the importance of continuing investigations in Brazil about GNSS modernization using the new signals transmitted by the satellites. The GNSS include GPS, GLONASS, Galileo, SBAS, Beidou and LAAS. However, in this work only GPS, GLONASS and Galileo system are taken into account. In order to integrate these three systems it is possible to accomplish linear combinations in absolute and relative positioning. Some problems in these combinations were detected and solutions for the unmodeled effects were recommended. For the ionospheric effect, an ion-free combination using three frequencies was performed. This combination can eliminate the ionosphere effects of first and second order. In this paper a bibliographical revision of the ambiguity solution using three systems is accomplished. Furthermore, an experiment was carried out to analyze... (Complete abstract click electronic access below)
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Mestre
Gessi, Luca. "Analisi e implementazione di tecniche di data fusion GNSS/IMU per localizzazione di precisione." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.
Знайти повний текст джерелаQuan, Yiming. "A new machine learning based method for multi-GNSS data quality assurance and multipath detection." Thesis, University of Nottingham, 2017. http://eprints.nottingham.ac.uk/39748/.
Повний текст джерелаAlshawaf, Fadwa [Verfasser], and S. [Akademischer Betreuer] Hinz. "Constructing water vapor maps by fusing InSAR, GNSS and WRF data / Fadwa Alshawaf. Betreuer: S. Hinz." Karlsruhe : KIT-Bibliothek, 2013. http://d-nb.info/1048384888/34.
Повний текст джерелаMorkel, Izak Gerhardus. "A GPS-based method for pressure corrections to neutron monitor data / Izak G. Morkel." Thesis, North-West University, 2008. http://hdl.handle.net/10394/2054.
Повний текст джерелаPeixoto, da Rocha Cesar. "Proposta de uma tecnologia para levantamento da morfologia costeira com aplicação de tecnologia GNSS." Universidade Federal de Pernambuco, 2009. https://repositorio.ufpe.br/handle/123456789/8196.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior
O ambiente costeiro é berçário natural para um grande número de espécies marinhas, principalmente onde ocorrem mangues e recifes, que funcionam como abrigo natural para a desova e início de vida de muitas espécies marinhas. A linha de costa está inserida nesse ambiente, pois representa o limite entre o mar e o continente, no alcance máximo das ondas, onde cessa a ação marinha efetiva. Entretanto, a dinâmica de movimentação das marés torna esse limite uma zona de fronteira de difícil demarcação e monitoramento. Além disso, as alterações geomorfológicas, muitas vezes catalisadas pelas interferências antrópicas, diminuem a capacidade de regeneração natural das praias, dificultando o gerenciamento desse ambiente. Em virtude disso, essa tese desenvolveu alguns experimentos para localizar e monitorar linhas de costa nas praias de Sauaçui e Japaratinga, localizadas no Estado de Alagoas Brasil, aplicando tecnologia de posicionamento dos sistemas GNSS (Global Navigation Satellite System), com base em um indicador de linha de costa com representação matemática, correspondente à máxima altura alcançada pelas marés nos últimos 20 anos, acrescida do run-up, correspondente ao espraio das ondas. O GPS (Global Positioning System), que a partir deste ponto será designado apenas GPS, consiste em um sistema de posicionamento por satélite pertencente ao GNSS e pode gerar posicionamentos no modo dinâmico relativo, com precisão de poucos centímetros e suas técnicas já vem sendo aplicadas em programas de gerenciamento costeiro em várias partes do mundo. Entretanto, as alturas geradas pelo GPS são elipsoidais e representam um problema para o uso desse sistema em aplicações que envolvem altitudes, como é o caso das linhas de costa, que são relacionadas com o nível do mar. A técnica proposta nessa tese gera o modelo de elevação digital da praia, com base em perfis de praia, no mesmo referencial de nível das marés e nele identifica a linha de costa. Para isso, os referenciais verticais de maré e do GPS são correlacionados através de um artifício apropriado que requer o conhecimento das alturas de maré e do GPS em um mesmo local. Os perfis de praia aqui referidos são constituídos de pontos coordenados gerados pelo deslocamento de uma antena GPS em ziguezague ao longo da praia. Essa metodologia mostrou-se adequada para localizar e monitorar linhas de costa com precisão sub-métrica e tem como principal vantagem o fato desse modelo facilitar a visualização do comportamento da linha d´água, sendo apropriado para simular o deslocamento do mar sobre o continente. Os resultados mostram a localização geográfica das linhas de costa das praias objeto desse estudo, expressas no Sistema de Projeção Cartográfica Universal Transverso de Mercator (UTM). O monitoramento da linha de costa provém da comparação do seu traçado, superpondo-se os modelos produzidos em diferentes épocas e indica comportamento sazonal das linhas de costas tanto nas praias de Japaratinga (máximo de 6,0 m), como na praia de Sauaçui (máximo de 8,0 m). Além disso, como o referencial do GPS tem grande estabilidade, ele pode ser usado no monitoramento da estabilidade dos marcos de apoio, cujas coordenadas são suscetíveis de alterações, em havendo subsidências do solo e/ou movimentações de placas da crosta terrestre
SHAIKH, MUHAMMAD MUBASSHIR. "GNSS Radio Occultation for Ionospheric Monitoring – Impact and Mitigation of High Solar Activity Effects." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2586161.
Повний текст джерелаDejan, Vasić. "Model geodetskog premera savremenim akvizicionim tehnologijama." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2018. https://www.cris.uns.ac.rs/record.jsf?recordId=106256&source=NDLTD&language=en.
Повний текст джерелаThe collection of spatial data is carried out today by conventional methods,which usually provide the required accuracy of the output data in the projectsof diameter and diameter reconstruction, by various projects in the field ofengineering geodesy. On the other hand, the development of newtechnologies and data collection devices imposes new methods of work thatprovide an incomparably higher level of detail than conventional methods,and they often have an advantage over conventional, especially inengineering projects. In the dissertation, the model of geodetic diametermodel was presented with modern acquisition technologies that meets thequality criteria defined by the Land Regulations Rulebook and the criteria ofengineering geodesy.
Guner, Dunya Rauf Levent. "Inertial Navigation Sytem Improvement Using Ground Station Data." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12615036/index.pdf.
Повний текст джерелаHaselmaier, Lawrence H. "Computation of a Virtual Tide Corrector to Support Vertical Adjustment of Autonomous Underwater Vehicle Multibeam Sonar Data." ScholarWorks@UNO, 2015. http://scholarworks.uno.edu/td/2080.
Повний текст джерелаHannay, Peter. "A non-device specific framework for the development of forensic locational data analysis procedure for consumer grade small and embedded devices." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2017. https://ro.ecu.edu.au/theses/2026.
Повний текст джерелаRaabe, Armin, Michael Bender, and Jens Wickert. "Final results of the DFG funded project “Development of a tomographic water vapour sounding system based on GNSS data”." Universität Leipzig, 2013. https://ul.qucosa.de/id/qucosa%3A16410.
Повний текст джерелаSeit 2008 befasst sich eine Arbeitsgruppe von Wissenschaftlern am LIM und dem GFZ in Potsdam im Rahmen eines DFG-geförderten Projektes mit der Ableitung von dreidimensionalen Wasserdampfverteilungen in der Atmosphäre aus Beobachtungsdaten regionaler GNSS-Bodennetze (GlobaleNavigationsSatellitenSysteme). Die Wasserdampfverteilungen können aus der atmosphärischen Information entlang der Sichtlinien zwischen den Bodenstationen und den sichtbaren GNSS-Satelliten (sogenannte Slants) berechnet werden. Diese zahlreichen Sichtlinien ermöglichen eine tomographische Verarbeitung der Daten. Der entwickelte tomographische Algorithmus nutzt derzeit bis zu 330 deutsche und nahe Deutschland gelegene GNSS-Stationen, was eine horizontale Auflösung der resultierenden 3D-Felder von 40km und einer vertikalen Auflösung von 0,5km bis hinab zur atmosphärischen Grenzschicht (bis 1 km über dem Boden) ermöglicht
Tonetto, Leonardo. "A Particle Filter approach to GPS signals." Thesis, KTH, Skolan för informations- och kommunikationsteknik (ICT), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177320.
Повний текст джерелаOrliac, Etienne J. "Development of azimuth dependent tropospheric mapping functions, based on a high resolution mesoscale numerical weather model, for GNSS data processing." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10861/.
Повний текст джерелаCaparra, Gianluca. "Authentication and Integrity Protection at Data and Physical layer for Critical Infrastructures." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3421920.
Повний текст джерелаQuesta tesi esamina i servizi di autenticazione e la protezione di integrità in due contesti emergenti come Global Navigation Satellite Systems (GNSS) e the Internet of Things (IoT), analizzando varie tecniche proposte in letteratura e proponendone di originali. I sistemi di navigazione satellitare, di cui il più conosciuto ed utilizzato è GPS, forniscono servizi di posizionamento e sincronizzazione temporale con copertura globale. Esistono vari motivi per attaccare GNSS: dai motivi legati alla privacy, all’attaccare infrastrutture critiche per scopi terroristici. La generazione e trasmissione di segnali GNSS contraffatti, per scopi di ricerca o per effettuare attacchi, è diventata più semplice negli ultimi anni con l’aumento della potenza computazionale e la disponibilità di Software Defined Radios (SDRs), dispositivi radio general purpose che possono essere programmati sia per ricevere che per trasmettere segnali RF. Questa tesi fa una analisi di sicurezza delle principali tecniche di autenticazione per GNSS proposte in letteratura, sia al livello dati che al livello di segnale. È proposto uno schema originale di autenticazione al livello dati, SigAm, che combina la sicurezza delle primitive crittografiche asimmetriche con le performance delle funzioni di hashing o di funzioni crittografiche simmetriche. Inoltre, è proposta una generalizzazione degli attacchi security code estimation and replay e delle rispettive tecniche di difesa, migliorando le prestazioni in entrambi i versanti, ed è proposta una tecnica anti-spoofing autonoma che usa semi-codeless tracking. Infine, sono discusse tecniche di autenticazione a livello fisico applicate ad IoT, mettendo in risalto il trade-off tra le performance e il costo energetico del processo di autenticazione.
Hotta, Kohei. "Style and process of magma intrusion based on combined ground deformation data in and around Sakurajima volcano, southern Kyushu, Japan." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215323.
Повний текст джерелаLeksell, Torbjörn. "A Comparison of Smartphone GPSL1 and Galileo E1-B/C Spoofing Resilience." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-292950.
Повний текст джерелаPositionstjänster har växt i betydelse allteftersom smarttelefoner och positionsapplikationer har blivit en integral del av våran vardag. Även om satellitpositionering utger det mest precisa och vedertagna positionsbestämningen av tillgängliga positionstjänser så är de publika satellitnavigeringssignalarna oskyddade och sårbara för förfalskningsattacker. Tidigare forskning inom området har evaluerat dessa sårbarheter och visat att ett betydande antal smarttelefoner var sårbara för GPS-L1 förfalskningsattacker och att denna forskning borde utökas i framtiden allteftersom satellitnavigeringsmottagare med förmåga att mottaga olika satellitsignaler integreras i smarttelefoner. Givet att en majoritet av nya smarttelefoner nu integrerar denna typ av mottagare så utvärderar detta arbete hur sårbarheten mot förfalskningsattacker beror på typ av satellitsignal genom en komparativ jämförelse av sårbarhet mellan GPS-L1 och den nyare Galileo E1-B/C signalen. För att genomföra utvärderingen så utvecklade vi en Galileo E1-B/C signalsimulator som tillsammans med GPS-L1 signalsimulatorn (GPS-SDR-SIM) utgjorde grunden för en serie av experiment designade för att identifiera och utvärdera sårbarheter och potentiella motåtgärder i smarttelefoner. Våra resultat indikerar att smarttelefoner är betydligt mer sårbara for GPS-L1 forfalskningsattacker då de accepterade GPS-L1 signaler med betydande position, tid, och datafel medans motsvarande Galileo E1-B/C signaler ej accepterades. Trots resultaten så är det viktigt att inte dra för starka slutsatser då underlaget var kraftigt begränsat givet rådande omständigheter (Covid), som gjorde det svårt/omöjligt att på ett säkert sätt samla volontärer med olika smarttelefoner för våra experiment. Därav så är det viktigt att i framtiden utöka arbetet med ett större underlag och fler signaltyper.
Suneson, Oscar. "Spatial Variability in the Ionosphere and GNSS Signal Delays in the L-band: A Direct Comparison of In-Situ Satellite- and Swepos-Data." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448889.
Повний текст джерелаBedada, Tullu Besha. "Absolute geopotential height system for Ethiopia." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4726.
Повний текст джерелаItoh, Yuji. "Crustal Deformation Model of the Southern Kurile Subduction Zone Inferred from Geodetic Observation Data." Kyoto University, 2020. http://hdl.handle.net/2433/253092.
Повний текст джерелаWaqar, Adnan. "Enhancing the capabilities of electronic performance tracking system for applications in sports." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2022. https://ro.ecu.edu.au/theses/2562.
Повний текст джерелаJílek, Tomáš. "Pokročilá navigace v heterogenních multirobotických systémech ve vnějším prostředí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-234530.
Повний текст джерелаGentilini, Lorenzo. "Kalman Filters: Linear and Nonlinear applications in Sensor Fusion." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Знайти повний текст джерелаSorge, Alberto. "Analisi di sensibilità di strumentazione GNSS a basso costo ed elaborazione dati mediante software libero GoGPS." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13994/.
Повний текст джерелаDI, PIETRA VINCENZO. "Seamless Positioning and Navigation in Urban Environment." Doctoral thesis, Politecnico di Torino, 2019. http://hdl.handle.net/11583/2732878.
Повний текст джерелаLassoued, Khaoula. "Localisation de robots mobiles en coopération mutuelle par observation d'état distribuée." Thesis, Compiègne, 2016. http://www.theses.fr/2016COMP2289/document.
Повний текст джерелаIn this work, we study some cooperative localization issues for mobile robotic systems that interact with each other without using relative measurements (e.g. bearing and relative distances). The considered localization technologies are based on beacons or satellites that provide radio-navigation measurements. Such systems often lead to offsets between real and observed positions. These systematic offsets (i.e, biases) are often due to inaccurate beacon positions, or differences between the real electromagnetic waves propagation and the observation models. The impact of these biases on robots localization should not be neglected. Cooperation and data exchange (estimates of biases, estimates of positions and proprioceptive measurements) reduce significantly systematic errors. However, cooperative localization based on sharing estimates is subject to data incest problems (i.e, reuse of identical information in the fusion process) that often lead to over-convergence problems. When position information is used in a safety-critical context (e.g. close navigation of autonomous robots), one should check the consistency of the localization estimates. In this context, we aim at characterizing reliable confidence domains that contain robots positions with high reliability. Hence, set-membership methods are considered as efficient solutions. This kind of approach enables merging adequately the information even when it is reused several time. It also provides reliable domains. Moreover, the use of non-linear models does not require any linearization. The modeling of a cooperative system of nr robots with biased beacons measurements is firstly presented. Then, we perform an observability study. Two cases regarding the localization technology are considered. Observability conditions are identified and demonstrated. We then propose a set-membership method for cooperativelocalization. Cooperation is performed by sharing estimated positions, estimated biases and proprioceptive measurements. Sharing biases estimates allows to reduce the estimation error and the uncertainty of the robots positions. The algorithm feasibility is validated through simulation when the observations are beacons distance measurements with several robots. The cooperation provides better performance compared to a non-cooperative method. Afterwards, the cooperative algorithm based on set-membership method is tested using real data with two experimental vehicles. Finally, we compare the interval method performance with a sequential Bayesian approach based on covariance intersection. Experimental results indicate that the interval approach provides more accurate positions of the vehicles with smaller confidence domains that remain reliable. Indeed, the comparison is performed in terms of accuracy and uncertainty
Toledo, Moreo Rafael. "Un sistema de navegación de alta integridad para vehículos en entornos desfavorables." Doctoral thesis, Universidad de Murcia, 2006. http://hdl.handle.net/10803/10923.
Повний текст джерелаRoad applications such as traveller information, automatic emergency calls, freight management or electronic fee, collection require a onboard equipment (OBE) capable to offer a high available accurate position, even in unfriendly environments with low satellite visibility at low cost. Specifically in life critical applications, users demand from the OBEs accurate continuous positioning and information of the reliability of this position. This thesis presents a solution based on the fusion of Global Navigation Satellite Systems (GNSS) and inertial sensors (GNSS/INS), running an Extended Kalman Filter combined with an Interactive Multi-Model method (IMM-EKF). The solution developed in this work supplies continuous positioning in marketable conditions, and a meaningful trust level of the given solution. A set of tests performed in controlled and real scenarios proves the suitability of the proposed IMM-EKF implementation, as compared with low cost GNSS based solutions, dead reckoning systems and single model extended Kalman filter (SM-EKF) solutions.
Chiriaco, Isabella. "Sviluppo e caratterizzazione di metodi numerici per la stima del ritardo ionosferico tramite dati GNSS." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22946/.
Повний текст джерелаTonna, Arianna. "Sviluppo e caratterizzazione di metodi numerici per la stima del ritardo troposferico tramite dati GNSS." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/22852/.
Повний текст джерелаVarli, Dogan. "Modulation Coding In A Radio Link And Data Transfer Application Using L2 VPN Ethernet Over MPLS In A Large Network." Thesis, Högskolan i Gävle, Avdelningen för elektronik, matematik och naturvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-20961.
Повний текст джерелаPlanta, Giorgia. "Analisi delle prestazioni di un codice di calcolo open-source per l'elaborazione dati GNSS in modalità cinematica finalizzata al monitoraggio di strutture e applicazione di filtri sequenziali." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10436/.
Повний текст джерелаGambuzzi, Ilaria. "Rilevamento con Laser Scanner Terrestre e restituzione 3D del monastero di San Domenico sito in Montecreto (MO): integrazione con dati da interferometria satellitare e possibili cause del quadro fessurativo." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23277/.
Повний текст джерелаHsu, Chih-Ting, and 徐稚婷. "GNSS RO data assimilation of ionospheric numerical weather prediction." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/yhcyqx.
Повний текст джерела國立中央大學
太空科學研究所
106
This dissertation evaluates the ability of the Formosa Satellite-3/Constellation Observing System for Meteorology, Ionosphere and Climate (FORMOSAT-3/COSMIC) and the FORMOSAT-7/COSMIC-2 Global Navigation Satellite System (GNSS) Radio Occultation (RO) data to improve ionospheric specification and forecasting in the contest of ionospheric Numerical Weather Prediction (NWP) aided by data assimilation. For this purpose, both electron density profile and slant Total Electron Content (sTEC) data provided by the FORMOSAT-3/COSMIC and the FORMOSAT-7/COSMIC-2 missions are assimilated into a coupled first-principles model of the thermosphere and ionosphere by using ensemble square root filters. Along with evaluation of observational data, the dissertation investigates roles of incorporating ion-neutral coupling into data assimilation processes and the impact of different auxiliary ensemble data assimilation methods. The role of ion-neutral coupling to ionospheric NWP systems is addressed first in this study. The FORMOSAT-3/COSMIC electron density profiles are assimilated into the Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM), using Ensemble Adjustment Kalman Filter (EAKF) implemented in the Data Assimilation Research Testbed (DART). Combining the EAKF and the TIE-GCM allows a self-consistent treatment of ion-neutral coupling in both analysis and forecast steps of data assimilation. Both thermospheric and ionospheric variables are updating according to the background error covariance in the EAKF, and the updated state variables further affect other state variables through the physical ion-neutral coupling processes described by the TIE-GCM in Observing System Simulation Experiments (OSSEs). By updating different combinations of thermospheric and ionospheric variables in OSSEs, the impact of coupling processes on ionospheric NWP can be assessed. It is demonstrated that the incorporation of ion-neutral coupling can significantly improve the ionospheric electron density analysis and forecast, with the thermospheric composition being the most significant state variable. Next, in the second part of this study, RO sTEC data, instead of electron density profiles, are attempted with the goal of further enhancing the ability of the FORMOSAT-3/COSMIC and FORMOSAT-7/COSMIC-2 to improve ionospheric specification and forecasting by eliminating the errors in electron density profiles that are introduced by the assumption of a spherical symmetric ionospheric electron density distribution in retrieval processes. Since the upper boundary of the TIE-GCM is 500-700 km, which is too low for assimilation of GNSS RO sTEC, another data assimilation system, the Community Gridpoint Statistical Interpolation (GSI) Ionosphere is used. The GSI Ionosphere is constructed using the GSI Ensemble Square Root Filter (EnSRF) and the Global Ionosphere Plasmasphere/TIE-GCM (GIP/TIE-GCM). Because the EAKF and the EnSRF are methodologically equivalent, the major difference between the DART/TIE-GCM and the GSI Ionosphere is the first-principles models employed in these two systems. The GIP/TIE-GCM is a coupled model of the thermosphere, ionosphere, and plasmasphere, and the plasma in the GIP/TIE-GCM are simulated along geomagnetic flux tubes, allowing the model to be extended to the plasmasphere, which adds flexibility for various future applications, such as incorporating the model with observation at higher altitude or studying the role of coupling of plasmasphere and ionosphere on ionospheric NWP. In order to make quantify assessments of capability of the GSI Ionosphere to improve the low- and mid-latitude ionospheric specification and forecasting through assimilation of GNSS RO sTEC, a number of OSSEs are carried out by using synthetic FORMOSAT-7/COSMIC-2 data. An additional question addressed with the GSI ionosphere is the comparative evaluation of the FORMOSAT-3/COSMIC and FORMOSAT-7/COSMIC-2 observing systems. The effect of major EnSRF parameters, including the ensemble size and covariance localization schemes, on the assimilation analysis is investigated extensively, and are optimized to yield the highest quality assimilation analysis within the parameter range explored in this dissertation. The result shows that assimilation of sTEC data from the FORMOSAT-7/COSMIC-2 mission through the use of the GSI Ionosphere could potentially improve the low- and mid-latitude ionospheric specification considerably. In the third part of this study, for the purpose of demonstrating the ability of the GSI Ionosphere data assimilation system to improve low- and mid-latitude ionospheric monitoring and forecasting with actual data rather than synthetic data, a case study is carried out under geomagnetically quiet and low solar activity conditions with the FORMOSAT-3/COSMIC GNSS RO sTEC data. Real FORMOSAT-3/COSMIC GNSS RO sTEC data during January 01, 2013 and January 02, 2013 is assimilated into the GSI Ionosphere, and the result is compared with the Center of Orbit Determination in Europe (CODE) Global Ionosphere Maps (GIMs). Result shows that, by assimilating sTEC data into the GSI Ionosphere, the feature of the Equatorial Ionization Anomaly (EIA) in the GSI Ionosphere becomes closer to that of the CODE GIMs. However, the correction of EIA magnitude by using EnSRF still need to be addressed. Comparing with the FORMSAT-3/COSMIC, the FORMOSAT-7/COSMIC-2 will be able to provide more dens data volume in low- and mid-latitude region. As a result, this issue can be solved by incorporating the FORMOSAT-7/COSMIC-2 data into the GSI Ionosphere in the future, since the sTEC data volume will be increased considerably
(9354989), Feixiong Huang. "Assimilation of GNSS-R Delay-Doppler Maps into Weather Models." Thesis, 2020.
Знайти повний текст джерелаGonçalves, Hugo Valentim Figueira. "Automatization of Real Time GNSS Data Acquisition, Validation, Processing for Water Vapor Estimation NUVEM." Master's thesis, 2016. http://hdl.handle.net/10400.6/6077.
Повний текст джерелаNos últimos anos, Sistemas de Navegação Global por Satélite (GNSS), em particular o Sistema de Posicionamento Global (GPS), têm provado a sua capacidade para monitorizar o vapor de agua existente na atmosfera, com uma precisão ao nível de outras soluções mais tradicionais. Este tipo de sistemas tem várias vantagens comparado com os tradicionais sistemas de observação. Entre estas vantagens estão o baixo custo de operacionalização, e a alta cobertura espacial e temporal. Como resultado a previsão de Atraso Total de Zenith (ZTD) e a previsão de Vapor de Água Precipitável (PWV) foi estabelecido como uma técnica de observação standard. ZTDs e PWVs já são hoje em dia utilizados em vários países (nomeadamente Reino Unido, França e Alemanha) como um dos factores que ajuda nos modelos de meteorologia. No entanto, a precisão das estimativas de ZTD/PWV em tempo quase real baseadas em orbitas ultra rápidas do sistema GPS, encontra-se ainda em estudo. Nesta dissertação é descrita a implementação e os testes de validação da computação de PWV em tempo quase real feita pelo SEGAL no âmbito do projecto NUVEM que ocorreu entre 2015 e 2016, o esquema de cálculo dos parâmetros atmosféricos (ZTD e PWV) e o seu envio atempadamente ao Instituto Português do Mar e da Atmosfera (IPMA) é descrito em detalhe. O foco centrou-se na componente informática. No entanto alguns estudos, relativos aos resultados obtidos, foram realizados de forma a poder definir alguns parâmetros necessários na fase operacional do projecto. A computação das soluções está dependente de vários processos. Houve a necessidade destes serem analisados e optimizados separadamente. Eles são: • download dos dados GNSS dos provedores externos, uma vez que o projecto depende desses dados, adquiridos em diferentes redes GNSS em Portugal e Espanha; • download dos dados adicionais (órbitas e relógios) necessários à computação dos dados GNSS; • obtenção via modelos de previsão numérica dos valores de pressão e temperatura necessários para a conversão de ZTD em PWV (feito pelo IPMA); • computação das soluções GNSS tão rápido quanto possível; • upload das soluções (numéricas e gráficas) para o IPMA e para o website; • redundância dos recursos computacionais. Existem funcionalidades e melhorias que podem ser implementadas no futuro de forma a optimizar o uso de GNSS-PWV para o nowcasting em Portugal. Contudo, os objectivos foram atingidos, uma vez que, o sistema NUVEM está em modo operacional, sendo executado no SEGAL e providenciando ao IPMA as soluções que são depois usados na análise de eventos atmosféricos em tempo quase real.
SHENG, HSU CHIH, and 許志生. "The Study of Using GNSS data in Network Adjustment Analysis and Reservoir Deformation Monitoring." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/55822599767649263632.
Повний текст джерела國防大學理工學院
空間科學碩士班
101
Recently, the technology of GNSS(Global Navigation Satellites System) positioning is rapidly developed. This work shows that more positioning accuracy of monitored points of Geodetic Datum could be achieved by GNSS data with suitable network adjustment model, it’s proved that the technology of GNSS positioning really could be applied on the deformation monitoring. This study is combined GNSS with Robotic Total Station(RTS)for Reservoir Deformation Monitoring. Selected experimental area as Shihmen Reservoir located in Daxi Township, Taoyuan County, it organize 3 individual network adjustment models which applied 7 Taiwan’s satellite tracking stations and 1 international satellite tracking station(TWTF) as reference points. With RTS verified, the differential values between RMS values by using Bernese 5.0 software and published values by MOI (Ministry of the Interior) can be computed, and the best network model can be achieved for Reservoir Deformation Monitoring. Results show that first model (including 8 satellite tracking station as reference points) is the best method of the others, and it shows systematic differential value between GNSS and RTS is about 0~-3.2cm. It also can be expected to provide the relationship of reliability in three-dimensional dynamic coordinates, and the average changeable values are estimated to be 0.18~0.61, -0.15~-0.55 and 12.05~69.59 cm at N, E and U moments. From result’s figures, almost changeable values of monitored points are detected about below centimeter degrees, and it’s corresponded with requirement of accuracy of Reservoir Deformation Monitoring.
Chi-MingLee and 李啓民. "Coastal Sea Level Variations Derived from GNSS SNR Data - A Case Study in Taiwan." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8y45bu.
Повний текст джерела國立成功大學
測量及空間資訊學系
105
Global sea level rise (SLR) has caused many kinds of disasters, damaging the lives and properties of numerous human beings, especially in low-lying coastal regions. Therefore, understanding and monitoring coastal sea level variations are of great importance for human society. This research used Global Navigation Satellite System (GNSS) signal-to-noise ratio (SNR) data from the GNSS stations located in Taiwan (Kaohsiung, Suao and TaiCOAST) and Sweden (Onsala Space Observatory, OSO) to compute sea level heights (SLH) by using three different methods, including Lomb Scargle Periodogram (LSP) aided with tidal harmonic analysis, LSP-only and inverse modeling (IM). The GNSS-derived sea level variations are compared with those from co-located or nearby traditional tide gauges. In Taiwan, the GNSS-derived sea level variations in Kaohsiung and Suao show good agreement with those from tide gauges with the standard deviations (STDs) of differences ranging from 7.1 - 11.1 cm and the correlation coefficients of 0.94-0.97. In addition, more than 80 % of SLH can be successfully achieved during the SNR available periods. Besides, the absolute sea level trend in Kaohsiung during 2006-2011 calculated by combining the vertical motion and the relative sea level from GNSS, is mm/yr, which agrees with that derived from satellite altimetry of mm/yr. However, this comparison is not robust because the uncertainty is almost the same level with the estimate, resulting from the short time coverage of data. In contrast, merely 40 % of SLH can be successfully provided by TaiCOAST and the STD of differences between GNSS-derived and tide gauge sea level changes is 1.12 m with a correlation coefficient of 0.13. TaiCOAST has poor performance for monitoring sea level changes since the GNSS signals may be reflected from intertidal zone when sea level ebbs. On the other hand, the GNSS-based tide gauge in Sweden can offer over 90 % of SLH by both LSP and IM methods. The STD of differences between sea level changes derived from GNSS SNR by IM and the tide gauge decreases about 2 cm compared with that by LSP and the correlation coefficient increases from 0.91 to 0.97. From the bottom line, the GNSS stations in Taiwan except for TaiCOAST demonstrate the potential of serving as GNSS-based tide gauges to measure sea level changes like a specially designed one (e.g. OSO) does.
Liu, Jung-Shan, and 劉榮山. "Implementation of e-GNSS and Multi-Map Data for Land Survey Corretion:Two Cases Study of Taoyuan District and Gueishan District." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/726uyw.
Повний текст джерела國防大學理工學院
空間科學碩士班
104
Land survey correction is the main duties of government of land affairs departments in Taiwan. Because of the rapidly of economy development and the raisely of land price, people require more accuracy surveying results.Due to distribution of control points, mistakes of reliable land boundary coordinates and analysis of overlap mapping , traditional procedures of land survey correctionwould make different results.It brings about lots of land disputation and decrease of government credibility. Therefore, NLSC (National Land Surveying and Mapping Center) provides e-GNSS(ElectronicGlobalNavigationSatellite system) technology that not only save time of surveying but avoid surveying mistakes, toupgrade the quality of surveying results. Existing graphic informations for survey works of topographic maps, orthophoto images maps, cadastral digital maps, base-status-point maps, city planning maps and electronic-global mapseffectively supplied to cadastral survey of overlap mapping. Collecting with all graphic information, those data uniformly translated intothe TWD97 (Taiwan Datum 1997)coordinate system. It alsoassists works of land survey correctionand the graphic information could be provided the good valuation reference. This study established new SOP (Standard Operation Procedure), select Taoyuan District and Gueishan District which are 1/1200in proportiongraphics of the cadastral map in the range of the study area.Using high precision ofe-GNSS technology and multi-map data to handle affairs oftopographical densified control surveying,cadastral surveying and land survey correction. Because there is no accumulationresiduals of traditional densified topographicalcontrol surveying, measured points can be translated into a TWD97 coordinate system by 6-parameter translations and least square collocation method. It is proved that not onlyreduce of the operating time but also improve of working efficiency, new SOP corresponds with the rules of operating procedures and the accuracies of related specifications.
Lüer, Juliana. "Design and Development of a Measurement System to Track the Motion of a Point Absorber." Thesis, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-416222.
Повний текст джерелаRaděj, Karel. "Využití a výběr monitorovacího systému ve speciální tělesné přípravě AČR." Master's thesis, 2012. http://www.nusl.cz/ntk/nusl-306709.
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