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Dissertations / Theses on the topic 'Ephemerides'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

VANDIKE, JOHN LAWRENCE. "A FLEXIBLE FRAMEWORK FOR EPHEMERIDES CALCULATIONS." University of Cincinnati / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1132145140.

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2

Andreoli, Francesca. "Improvement of Jupiter's satellites ephemerides using stellar occultation observations." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/18030/.

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The inner Galilean moons orbiting Jupiter are locked into the so-called “Laplace resonance”, where the orbital periods of Ganymede, Europa and Io maintain a 4:2:1 ratio respectively. Resonant dynamics appear several times across the Solar System and determining whether the Jovian resonance is deepening or loosening would provide a direct insight into the origin and the evolution of the Solar System. At the moment, our knowledge of the Galilean moons' dynamics is not accurate enough to establish in which direction the system is evolving. Including stellar occultation observations obtained from

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Vandike, John L. "A flexible framework for the calculation of satellite ephemerides." Cincinnati, Ohio : University of Cincinnati, 2005. http://www.ohiolink.edu/etd/view.cgi?acc%5Fnum=ucin1132145140.

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4

Castellani, Daniele. "Estimation of the satellite ephemerides of Saturn using optical navigation pictures of Cassini." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20765/.

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The goal of this dissertation thesis is the estimation of the Saturnian satellites ephemerides using optical data of Cassini. In the first part we describe the software employed for the reduction of the images showing its main features and the accuracy that can be achieved comparing the results with published astrometry. Afterwards we describe the orbit determination problem (ODP) with particular focus on the weights selection for the estimation process. The third chapter describes the dynamical model used and the sources of potential errors in the residuals. The model have been validated try

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5

Gomez, Casajus Luis Antonio <1990&gt. "Development of methods for the global ephemerides estimation of the gas giant satellite systems." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amsdottorato.unibo.it/9006/1/GomezCasajus_Luis_tesi.pdf.

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The satellite systems of Saturn and Jupiter are complex dynamical systems, with several interactions happening between the central body, its rings and the natural satellites. During the last two decades, unmanned probes allowed to study the gas giant satellite systems. The three most relevant spacecrafts to their study have been Galileo, Cassini and Juno. Galileo studied the Jupiter system, the primary body and the main moons during 8 years, despite the failure on the deployment of its high gain antenna that limited the science retrieval. Cassini, analogously, studied during most of the 13

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6

Verma, Ashok Kumar. "Improvement of the planetary ephemerides using spacecraft navigation data and its application to fundamental physics." Thesis, Besançon, 2013. http://www.theses.fr/2013BESA2030/document.

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Les éphémérides planétaires jouent un rôle important pour la navigation des missions spatiales actuelles et la mise en place des missions futures ainsi que la réduction et l'analyse des observations astronomiques les plus précises. Les éphémérides planétaires actuelles (DE, INPOP, EPM)L'objectif de la thèse est d'utiliser des archives de données de missions spatiales passées et présentes et de fournir des outils d'analyse pour l'amélioration de l'éphéméride de données pour l'amélioration de l’éphéméride planétaire planétaire INPOP, ainsi que pour une meilleure utilisation des éphémérides pour

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7

Thackrey, Keith R. "A geometric approach to determination of satellite ephemeris over a limited area." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/43058.

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Range and,interferometric observations have been examined for their potential, application in a geometric approach to determination of satellite ephemeri. The approach differs from the normal (dynamic) approach in that each satellite position is treated as an independent state variable or benchmark. Programs have been developed that simulate and format the input, data for the least squares estimation routines, and perform statistical analyses of those results. Random error, tropospheric refraction errors, and atomic clock errors have been considered, and the range observation adjustme

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Magnanini, Andrea. "Estimation of the ephemerides and gravity fields of the Galilean moons through orbit determination of the JUICE mission." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21497/.

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Jupiter and its moons are a complex dynamical system that include several phenomenon like tides interactions, moon's librations and resonances. One of the most interesting characteristics of the Jovian system is the presence of the Laplace resonance, where the orbital periods of Ganymede, Europa and Io maintain a 4:2:1 ratio respectively. It is interesting to study the role of the Laplace Resonance in the dynamic of the system, especially regarding the dissipative nature of the tidal interaction between Jupiter and its closest moon, Io. Numerous theories have been proposed regarding the orbi

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Bonaldo, Rodrigo Bragio. "Comemorações e efemérides : ensaio episódico sobre a história de dois paralelos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2014. http://hdl.handle.net/10183/114415.

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“Comemorar efemérides” não é apenas uma expressão legítima utilizada para fazer referência à celebração de uma festa nacional. Desde o final do século XIX, ao menos em língua portuguesa, os dois termos têm sido associados como sinônimos. A presente tese representa um esforço em compreender o desenvolvimento de dois conceitos – comemorações e efemérides – na longa duração. Os encontros e desvios entre as práticas associadas a um e a outro serão pontuados através da seleção de episódios intelectuais, seguidos pelo exame de debates que os tocavam na periferia de suas articulações. Na primeira par

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10

Kelly, John T. "Practical astronomy during the seventeenth century almanac-makers in America and England /." New York : Garland Pub, 1991. http://catalog.hathitrust.org/api/volumes/oclc/22909220.html.

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11

Browne, Nathan J. James J. Light. "GPS ephemeris message broadcast simulation /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2005. http://library.nps.navy.mil/uhtbin/hyperion/05Sep%5FBrowne.pdf.

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Thesis (M.S. in Systems Technology (Joint Command, Control, and Communications (C3))--Naval Postgraduate School, September 2005.<br>Thesis Advisor(s): Dan C. Boger. Includes bibliographical references (p. 65-67). Also available online.

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Light, James J. "GPS ephemeris message broadcast simulation." Thesis, Monterey California. Naval Postgraduate School, 2005. http://hdl.handle.net/10945/2023.

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The warfighter constantly needs increased accuracy from GPS and a means to increasing this accuracy to the decimeter level is a broadcast ephemeris message containing GPS satellite orbit and clock corrections. The ephemeris message is produced at the GPS MCS (Master Control Station) which receives GPS signal data from NGA and Air Force worldwide and uses sophisticated software to produce the orbit and clock corrections. The problem is getting the ephemeris message to the tactical user in a forward operating area. This thesis proposed a notional architecture for pushing the ephemeris message to

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13

Xu, Shangjin. "Design and Implementation of the Ephemerizer System." Thesis, Linköping University, Department of Computer and Information Science, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-9137.

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<p>This thesis describes the system design and implementation of the secure Ephemerizer System that was first introduced by Radia Perlman in 2005. The system is designed to enable users to keep data for a finite period of time before making the data unrecoverable by destroying the keys with which the data was encrypted. The task of the Ephemerizer System service is to create, advertise, and destroy keys required for the Ephemerizer System's functionalities.</p><p>We designed the Ephemerizer System Service's security by placing the sensitive key management modules into a Trusted Computing Base

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Stacey, P. "Long-term ephemeris generation for mobile devices." Thesis, University College London (University of London), 2013. http://discovery.ucl.ac.uk/1389940/.

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GPS receivers in challenging signal reception areas can find it difficult to maintain continuous signal lock for the up-to 30 seconds needed to obtain the broadcast ephemeris from the satellites. It can take many minutes for receivers to obtain the ephemeris parameters from enough satellites to obtain a position fix. As well as users expecting a rapid time-to-first-fix (TTFF) when performing a warm start, the advent of the E-911 legislature in the USA also provides motivation for rapid TTFF with accurate positions. In this thesis, a scalable orbit prediction algorithm is developed to calculate

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Mariani, Vincenzo. "Méthodes bayésiennes et d'apprentissage supervisé pour la construction d'orbites planétaires." Electronic Thesis or Diss., Université Côte d'Azur, 2024. http://www.theses.fr/2024COAZ5059.

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Dans cette thèse, nous avons exploré les méthodes bayésiennes et d'apprentissage supervisé appliquées à l'orbitographie planétaire. Tout d'abord, nous présentons le problème général de la construction d'orbites planétaires et les outils mathématiques utilisés. Nous décrivons l'algorithme de Metropolis-Hastings (MH) et la régression par processus gaussien (GPR) afin d'obtenir la distribution a posteriori d'un paramètre de la dynamique planétaire, produisant une méthode de Monte-Carlo par chaînes de Markov (MCMC). En outre, nous introduisons la technique des arbres de décision par boosting (BDT)

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16

Silva, Gelbart Souza. "Ephemeris belli Troiani Dictys Cretensis : estudo e tradução /." São José do Rio Preto, 2019. http://hdl.handle.net/11449/182250.

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Orientador: Cláudio Aquati<br>Banca: Márcio Natalino Thamos<br>Banca: Norma Wimmer<br>Resumo: Neste trabalho, estudamos e traduzimos integralmente uma obra da literatura latina tardia conhecida como Ephemeris belli Troiani Dictys Cretensis (Diário da Guerra de Troia ), anônima e datável do século IV d. C. Ephemeris relata os eventos da Guerra de Troia do ponto de vista de um narrador em primeira pessoa que se apresenta como um soldado cretense de nome Díctis, alistado na tropa do comandante grego Idomeneu. A narração do prélio entre gregos e troianos, conhecida em literatura primordialmente pe

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Di, Ruscio Andrea. "Utilisation des données de radio science pour la construction d’éphémérides planétaires." Thesis, Université Côte d'Azur, 2021. http://www.theses.fr/2021COAZ4031.

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Le thème central de la thèse concerne l’utilisation des données de radio tracking pour le développement d’éphémérides planétaires, en particulier, dans deux cas : 1) analyse de données de navigation de la mission Cassini pour améliorer les éphémérides de Saturne et augmenter notre connaissance du système solaire externe ; 2) simulation des données radio de la mission ESA BepiColombo collectées durant la phase orbital à Mercure, pour évaluer leur contribution sur le développement des éphémérides planétaire de l’Intégrateur Numérique Planétaire de l’Observatoire de Paris (INPOP).Le premier sujet

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MAZZOLA, Simona Michela. "Accretion onto Neutron Stars: spectral and timing investigation of Low Mass X-ray Binaries." Doctoral thesis, Università degli Studi di Palermo, 2021. http://hdl.handle.net/10447/500712.

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Wolf, Robert. "Satellite orbit and ephemeris determination using inter satellite links." [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=961611820.

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20

Sasyn, Jan. "Staniční testování Mobilního automatizovaného astronomického systému." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226224.

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Subject of this master´s thesis is a station testing of Mobile automated astronomical system No. 1 (MAAS – 1). This system is used for measurement of astronomical coordinates by measurments of the stars. This thesis is focused on impact of some systematic effects, especially effects of inaccurate input geographic coordinates to resulting coordinates.

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Lozada, Vidal C. "Space-based telescopes for the actionable refinement of ephemeris systems and test engineering." Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/10642.

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This thesis presents the results and activities related to the design, analysis, construction, test, and integration of a flight-qualified satellite, the Space-based Telescopes for the Actionable Refinement of Ephemeris (STARE) satellite. This project has been a collaboration, led by Lawrence Livermore National Laboratory (LLNL) and including the Naval Postgraduate School (NPS) and Texas AandM University. Of particular importance are the processes, experiences, and results of testing the payload and integrated STARE satellite. In addition, an analysis of testing requirements specifically appro

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Siqueira, Loram. "Contribution of Unesp on broadcast ephemeris and PDOP monitoring for GNSS in the IGMA - Trial Project /." Presidente Prudente, 2020. http://hdl.handle.net/11449/192427.

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Orientador: João Francisco Galera Monico<br>Resumo: A modernização do GNSS (Global Navigation Satellite System) com a inclusão de novas constelações e melhorias nos sistemas já disponíveis foi avaliada com grande interesse na última década. A combinação de diferentes constelações de satélite expande as aplicações possíveis; portanto, o termo multi-GNSS apareceu para designar o uso desses múltiplos sistemas. O IGS (International GNSS Service), observando a necessidade dos usuários que começaram a usar o multi-GNSS, lançou em 2011 a proposta de projeto experimental IGMA (International GNSS Monit

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Xi, Xiaojin. "Analytical representation for ephemeris with short time-span : application to the longitude of Titan." Thesis, Paris Sciences et Lettres (ComUE), 2018. http://www.theses.fr/2018PSLEO015/document.

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Les éphémérides issues d'intégrations numériques qui peuvent être facilement téléchargées des sites de l'IMCCE ou du JPL, ont une très bonne précision pour les observations récentes. En même temps, un autre type d'éphémérides, celles analytiques comme TASS, décrivent en détail le système dynamique par une représentation en combinaison de fréquences propres. Notre but est d'associer ces deux types d'éphémérides pour l'utiliser dans les études de la rotation des satellites naturelles. Cela signifie qu'il faut reconstruire des éphémérides à long terme et de haute précision montrant les caractéris

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Gómez, Peinado Elísabet. "La Ephemeris Belli Troiani: edición del texto y estudio de los aspectos filológicos y literarios." Doctoral thesis, Universidad de Alicante, 2015. http://hdl.handle.net/10045/54016.

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En el siglo IV d.C. la Ephemeris belli Troiani de Lucio Septimio se presentaba, en su epistula y prologus introductorios, como una traducción latina de un original griego escrito por Dictis Cretense, que relató a modo de diario los sucesos de la guerra de Troya. Por otra parte, existían testimonios de eruditos bizantinos que hacían referencia también a este Dictis como autor de la Ephemeris belli Troiani. Sin embargo, no se tenía testimonio alguno de dicha obra griega, por lo que su existencia planteaba ciertas dudas. No fue hasta 1907 cuando, tras la publicación de un fragmento de papiro de l

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Barber-James, Helen Margaret. "Systematics, morphology, phylogeny and historical biogeography of the Mayfly family Prosopistomatidae (Ephemeroptera: Insecta) of the world." Thesis, Rhodes University, 2011. http://hdl.handle.net/10962/d1005473.

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The diversity, classification and historical biogeography of the mayfly family Prosopistomatidae are explored. First, the higher classification of the Ephemeroptera is reviewed, focussing on the phylogenetic placement of the Prosopistomatidae relative to other mayfly families. All relevant literature from 1762 to 2010 is synthesized. Baetiscidae are established as the probable sister lineage of Prosopistomatidae, the two constituting the superfamily Baetiscoidea. Next, qualitative morphological variation within the Prosopistomatidae is reviewed and revised, emphasizing nymphs because imaginal

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Li, Shanna. "Une nouvelle réduction des anciennes observations de Phoebe et amélioration de son orbite." Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEO008/document.

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Dans cette thèse, la recherche se concentre sur le re-calibrage des observations historiques de Phoebe, le 9ème satellite de Saturne, et l'amélioration de son orbite sur la base des données re-calibrés. La précision de calcul de l'orbite dépend de la qualité du modèle théorique (erreur interne) et de la précision des observations utilisées pour ajuster le modèle (erreur externe). Phoebe est loin de sa planète et des satellites majeurs. Le modèle théorique n'est pas très compliqué et l'erreur interne est bien connu et généralement bonne. Toutefois, l'erreur externe est en général inconnue et es

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Fredin, Elias. "GNSS undersökning : För bättre precision i smartphones." Thesis, Mittuniversitetet, Institutionen för informationssystem och –teknologi, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-36584.

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To be able to receive a position from a smartphone user is very valuable. Wit- hout this many applications would not work at all. For many applications the existing position libraries are not good enough, for example augmented reality applications which requires millimeter precision for a good experience. The goal of this report is to study if GNSS positioning can be improved for smartphones.The study focuses mostly on Android and has the goal of using the method “trilateration” to combine multiple satellites position and their distance to a receiver in order to calculate a real position. The

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Yin, Hang. "AN ADAPTIVE MULTI-FREQUENCY GPS TRACKING ALGORITHM, GPS CNAV MESSAGE DECODING, AND PERFORMANCE ANAYSIS." Miami University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=miami1407774289.

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Gerlofsma, Jocelyn. "The effects of anoxia and temperature on the development and survivorship of Hexagenia (Ephemeroptera: Ephemeridae) embryos, and implications for western Lake Erie populations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ52555.pdf.

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Mastoridis, Klimis. "Casting the Greek newspaper : a study of the morphology of the ephemeris from its origins until the introduction of mechanical setting." Thesis, University of Reading, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361424.

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Fazan, Antônio Juliano [UNESP]. "Predição de sombras de edifícios sobre vias urbanas com base em um modelo digital de elevações e dados de imagens aéreas de alta-resolução." Universidade Estadual Paulista (UNESP), 2007. http://hdl.handle.net/11449/86818.

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Made available in DSpace on 2014-06-11T19:22:26Z (GMT). No. of bitstreams: 0 Previous issue date: 2007-04-20Bitstream added on 2014-06-13T18:47:37Z : No. of bitstreams: 1 fazan_aj_me_prud.pdf: 2364125 bytes, checksum: cd65fb05ed616ab1330e59a785328669 (MD5)<br>Este trabalho apresenta uma metodologia para a predição de sombras projetadas por edifícios em vias urbanas usando imagens aéreas de alta-resolução e modelos digitais de elevações (MDE). Elementos de sombra podem ser usados na modelagem de informação contextual para, por exemplo, a extração semi-automática ou automática da malha viária

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Fazan, Antonio Juliano. "Predição de sombras de edifícios sobre vias urbanas com base em um modelo digital de elevações e dados de imagens aéreas de alta-resolução /." Presidente Prudente : [s.n.], 2007. http://hdl.handle.net/11449/86818.

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Orientador: Aluir Porfírio Dal Poz<br>Banca: Antônio Maria Garcia Tommaselli<br>Banca: Francisco Henrique de Oliveira<br>Resumo: Este trabalho apresenta uma metodologia para a predição de sombras projetadas por edifícios em vias urbanas usando imagens aéreas de alta-resolução e modelos digitais de elevações (MDE). Elementos de sombra podem ser usados na modelagem de informação contextual para, por exemplo, a extração semi-automática ou automática da malha viária a partir de imagens aéreas ou de satélite, principalmente em áreas urbanas densas. O contexto modela as relações entre os objetos num

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Arora, Nitin. "High performance algorithms to improve the runtime computation of spacecraft trajectories." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49076.

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Challenging science requirements and complex space missions are driving the need for fast and robust space trajectory design and simulation tools. The main aim of this thesis is to develop new and improved high performance algorithms and solution techniques for commonly encountered problems in astrodynamics. Five major problems are considered and their state-of-the art algorithms are systematically improved. Theoretical and methodological improvements are combined with modern computational techniques, resulting in increased algorithm robustness and faster runtime performance. The five selected

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Собаєва, Д. А. "Знаходження ефемериди Марса". Thesis, Сумський державний університет, 2015. http://essuir.sumdu.edu.ua/handle/123456789/44006.

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Протягом сторіч створювалися різні математичні моделі Всесвіту. Вони змінювались із розвитком технічного обладнання та математики, разом із зміною уявлень про Всесвіт. Не дивлячись, на невірні дані про структуру Всесвіту, одна з таких моделей проіснувала 14 століть, причому майже незмінною. Це модель Птолемея-Гіппарха.

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Larocca, Ana Paula Camargo. "Análise de estratégias para processamento de redes geodésicas com o sistema de posicionamento global - GPS." Universidade de São Paulo, 2000. http://www.teses.usp.br/teses/disponiveis/18/18137/tde-24052006-101143/.

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O presente trabalho consiste de apresentação de metodologia para estudo, elaboração e análise de estratégias para processamento de observáveis GPS, para a constituição de redes geodésicas. No desenvolvimento deste trabalho foram utilizados os dados observados da rede geodésica do Estado de São Paulo, concluída em 1994. Esta rede é constituída por vinte e quatro pontos distribuídos pelo estado, mais o vértice CHUA, que é o vértice fundamental da triangulação do Sistema Geodésico Brasileiro. Através das estratégias elaboradas são analisados diversos fatores de importância relevante nos processam

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Bourgoin, Adrien. "Contraintes sur les violations à la symétrie de Lorentz par analyse des données de télémétrie laser Lune." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066481/document.

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La relativité générale (RG) et le modèle standard des particules permettent de comprendre les quatre interactions fondamentales de la nature. La formulation d'une théorie quantique de la gravitation permettrait d'unifier ces deux tenants de la physique moderne. D'après les grandes théories d'unification, une telle union est possible moyennant la brisure de certaines symétries fondamentales apparaissant à la fois en RG et dans le modèle standard telle la symétrie de Lorentz. Les violations de la symétrie de Lorentz peuvent être paramétrées dans tous les domaines de la Physique par une théorie e

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Ruiz, Rodilla Alvaro. "Vers une "poétique de l'inventaire" de José Emilio Pacheco : poésie et journalisme (1973-1983)." Thesis, Toulouse 2, 2016. http://www.theses.fr/2016TOU20056.

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Inventario (1973-2014) est une chronique de presse de longue haleine, basée sur l’empathie avec le lecteur et sur des formes de démocratisation de la culture, publiée dans le supplément Diorama de la cultura puis dans la revue Proceso de Mexico, et à laquelle le poète José Emilio Pacheco (1939-2014) se consacra jusqu’aux derniers instants de sa vie. La poésie trouve dans ces pages un espace privilégié de publication, de critique et de récits des faits. Notre travail de compilation de 1973 à 1983 embrasse l’époque de consolidation d’Inventario ainsi que le développement d’une écriture où se côt

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Hsu, Chao-Wei, and 徐超偉. "A Study of using the Least Squares Support Vector Machine Fitted GPS Ephemerides for the Impact on Point Positioning." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/44972421125852235920.

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碩士<br>國立中興大學<br>土木工程學系所<br>101<br>This study presents solutions for GPS orbit computation from broadcast, precise ephemerides, and the precise broadcast orbit correction using least squares support vector machine. Moreover, it analyzes impacts of sampling time and fitting method and the choice of ephemerides on precision of orbit, also evaluates the accuracy of ground point positioning after fitting. According to the experimental results, the fitting errors of satellite’s 3D coordinate components are still in the range of precise ephemerides while using LSSVM fitting with training set of about

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Nguyen, Lau Ngoc. "Improving GPS results using continuous processing strategies." Thesis, 2000. https://eprints.utas.edu.au/21029/1/whole_NguyenLauNgoc2000_thesis.pdf.

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The establishment of the International GPS Service for Geodynamics (IGS) in 1994 and the rapid development of its high quality products have opened promising, new capabilities for the global GPS positioning community. Two important products of the IGS are the precise satellite ephemerides and the precisely-determined locations of many permanent tracking sites distributed over the entire globe. In addition, we can obtain high quality RINEX data from the global tracking network on a daily basis. The combination of a multi-purpose regional GPS network and the nearby IGS fiducial s

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Munoz, Jean-Philippe. "Sun-perturbed dynamics of a particle in the vicinity of the Earth-Moon triangular libration points." 2008. http://hdl.handle.net/2152/17944.

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This study focuses on the Sun's influence on the motion near the triangular libration points of the Earth-Moon system. It is known that there exists a very strong resonant perturbation near those points that produces large deviations from the libration points, with an amplitude of about 250,000 km and a period of 1,500 days. However, it has been shown that it is possible to find initial conditions that negate the effects of that perturbation, even resulting in stable, although very large, periodic orbits. Using two different models, the goal of this research is to determine the initial configu

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Froideval, Laurent Olivier. "A study of solar radiation pressure acting on GPS satellites." 2009. http://hdl.handle.net/2152/6623.

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An increasing number of GPS applications require a high level of accuracy. To reduce the error contributed by the GPS ephemerides, an accurate modeling of the forces acting on GPS satellites is necessary. These forces can be categorized into gravitational and non-gravitational forces. The non-gravitational forces are a significant contribution to the total force on a GPS satellite but they are still not fully understood whereas the gravitational forces are well modeled. This study focuses on two non-gravitational forces: Solar Radiation Pressure (SRP) and the y-bias force. Different SRP models

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Tzu-HsiangWei and 魏子翔. "Hourly and Weekly GPS Broadcast Ephemeris Prediction." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/72674105702250098954.

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CHING-YICHANG and 張清義. "Using GPS Velocity to Enhance Broadcast Ephemeris." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/13284575713829758338.

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Yi-HwaChang and 張玴華. "The Study on Extending GPS Broadcast Ephemeris." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/47147977273497765677.

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碩士<br>國立成功大學<br>航空太空工程學系碩博士班<br>100<br>Global Positioning System (GPS) has become more popular today. With the increase of personal mobile products, more demands from navigation and positioning systems are issued. Among them, the higher accuracy in position and velocity are one of the important key factors. A traditional GPS receiver usually takes 12.5 minutes to download the navigation message to provide location-based services, so that shortening the time-to-first-fix (TTFF) to achieve fast-positioning is a common goal of many research tasks. Since the precise ephemeris can be downloaded fro

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Lin, Jia-He, and 林家和. "Algorithm Design for GPS Satellite Long-Term Ephemeris." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/78358484718320233379.

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碩士<br>國立臺灣海洋大學<br>通訊與導航工程系<br>97<br>When the GPS receiver is opened, its the first speed of the positioning is depended on the receiver which has the available GPS navigation message. If the GPS receiver doesn’t have any GPS navigation message, we will call it to be the cold start. The warm start has the available almanac. And if it has the ephemeris, it will be called the hot start. At present the specification of the cold start and the warm start, their positioning time is less than 35 seconds. And the hot starting specification has been possible to achieve which in one second then locates.

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Chen, Chien-Ming, and 陳見明. "Application of Averaging Method in Satellite's Ephemeris Extension Problem." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/42351981125314892716.

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碩士<br>國立臺灣海洋大學<br>通訊與導航工程學系<br>100<br>The prediction of satellite orbit has played a crucial role in Global Navigation Satellite System (GNSS). For a GNSS receiver, ephemeris extension will enable fast positioning even in a cold-start situation. In this thesis, we propose an average method to estimate the Kepler elements, which in turn can be used to calculate the satellite position. An analytical solution is obtained by the method of averaging, where the satellite orbit perturbation considered in the thesis, includes nun-uniform spherical earth effect, n-body motion disturbances. In compared

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Liu, Kang-Tai, and 劉康台. "Satellite Orbit Perturbation Problem Analysis and Long-Term Ephemeris Application." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/35570716836656267135.

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碩士<br>國立臺灣海洋大學<br>通訊與導航工程學系<br>99<br>The of satellite orbit prediction has played a crucial role in GNSS navigation. Before the user's position can be actually determined, the receiver needs to download the navigation message in order to predict the satellite's position. This is a very time-consuming process and the receiver needs to download the message once every one to two hours. In this paper, we construct a perturbation- based method to calculate and predict satellite's orbit. The method is main based an numerical integration of perturbed satellite orbital equation, By considering the nun

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Wolf, Robert [Verfasser]. "Satellite orbit and ephemeris determination using inter satellite links / by Robert Wolf." 2001. http://d-nb.info/961611820/34.

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Chen, Jia-Hung, and 陳家宏. "The Estimation of GPS Broadcast Ephemeris with Using The Least-Squares Method." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/79559012574558458889.

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碩士<br>國立成功大學<br>航空太空工程學系碩博士班<br>97<br>The traditional GPS receiver must download broadcast ephemeris from the satellites. Downloading the information for guidance will cost 30 seconds, which will cost approximate 12.5 minutes for download the entire guidance message. The AGPS method setups the GPS receiver through the AGPS server, that will download the broadcast ephemeris from the satellites beforehand. The AGPS server will pass the broadcast ephemeris on to the user receiver by the internet connection, which will reduces the time to first fix ( TTFF ), and achieves the fast navigation. T

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Liu, Tien-Lei, and 劉添雷. "GPS Satellite Orbit and Ephemeris Prediction using Neural Network and Polynomial Curve Fitting." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/29834849833867772763.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>96<br>The Global Positioning System（GPS）is a set of real-time positioning system. So long as the signal surrounding the user's receiver and satellite is not obstructed, the GPS could provide the positioning three-dimension service for any users on earth in the absence of influences of weather, time, place etc. However, in addition to the accuracy of location, velocity, and time, the length of time the GPS receiver needs to fix for the first use under different circumstances is also an important performance parameter that cannot be ignored. Whether the GPS satellite

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