Détail de l'éditeur
Universität der Bundeswehr
localisé à :
Munich
Collections rattachées :
|
Documents disponibles chez cet éditeur (33)
Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externes
Titre : On generalized signal waveforms for satellite navigation Type de document : Thèse/HDR Auteurs : José Avila-Rodriguez, Auteur Editeur : Munich : Universität der Bundeswehr Année de publication : 2008 Importance : 438 p. Format : 21 x 30 cm Note générale : bibliographie
Vollständiger Abdruck der bei der Fakultät für Luft- und Raumfahrttechnik der Universität der Bundeswehr München zur Erlangung des akademischen Grades eines Doktor-Ingenieurs (Dr.-Ing.) eingereichten Dissertation / A thesis submitted to the faculty of aerospace engineering in fulfillment of the requirements for the degree of doctor of engineeringLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] bande spectrale
[Termes IGN] forme d'onde
[Termes IGN] modulation de fréquence
[Termes IGN] modulation du signal
[Termes IGN] onde porteuse
[Termes IGN] signal GNSSRésumé : (auteur) This thesis provides a comprehensive overview of all current and planned satellite navigation systems, either global or regional, putting special emphasis on their signal structure. Particular attention is paid to the European Global Navigation Satellite System Galileo, under development at the moment. The results of this work can be considered as a significant contribution to the design and development of the Galileo’s Open Service (OS) in the E1 frequency band. The present work provides as main contribution a generally valid theoretical framework with which all current and future navigation signals can be described. Generalized signal waveforms and their corresponding time and spectral characteristics are derived and investigated. Complete families of signals are presented and analyzed regarding their spectral and performance characteristics, underlining their potential for future generations of satellite navigation systems. This thesis proves that the generalized signal waveforms proposed in this work cover any current and other optimized signals that could be proposed in the future. In this sense, it is shown that all current navigation signals can be mathematically described as Multilevel Coded spreading Symbols or, in particular, as Binary Coded Symbols. Using the analytical expressions of the generalized signal model, the corresponding generalized signal waveforms are further studied regarding their Spectral Separation Coefficients (SSCs). This parameter is of great interest in satellite navigation to understand the compatibility between different signals. Generalized formulas for smooth spectra are also derived to calculate the SSCs between any two arbitrary signals. Particular cases of interest are computed following the obtained analytical expressions and by means of simulations with real Pseudo Random Noise (PRN) codes. Results from this comparison show a perfect matching between the predicted analytical results and the numerical computations. Realistic scenarios are carried out to assess the impact of non-ideal PRN codes and navigation data onto the spectral properties that have been derived analytically. Finally, current and new multiplexing schemes are studied in detail together with the feasibility to introduce optimized signal waveforms. Special attention is paid to understand the required changes that are necessary to multiplex non-binary signals. Pros and Cons of the different solutions are discussed and investigated with regard to the application of future signal waveforms. Among these last ones, the Composite Binary Offset Carrier (CBOC) implementation of the Multiplexed Binary Offset Carrier (MBOC) modulation for the Galileo’s Open Service signal in the E1 frequency band deserves an important chapter. In addition, some chapters are dedicated to analyze receiver structures optimized to work with MBOC for both GPS and Galileo. Note de contenu : 1. Introduction
1.1 Objectives of this Thesis
1.2 Contributions of this Thesis
1.3 Thesis Outline
2. Global Navigation Satellite Systems (GNSS)
2.1 GNSS – Thinking global
2.2 Scenes from the Present
2.3 The Global Positioning System (GPS
2.4 Galileo
2.5 GLONASS
2.6 Compass
2.7 Summary on Global Navigation Satellite Systems
2.8 Regional Satellite Navigation Systems
2.9 GNSS Augmentation Systems
2.10 Pseudolites
3. Galileo Baseline Evolution
3.1 Introduction
3.2 Square-Root Raised Cosine (SRRC) Signal waveforms for Galileo ?
3.3 Galileo Baseline of 2002
3.4 The Long Way to the Agreement
3.5 Agreement of 2004: BOC(1,1)+BOCcos(15, 2.5)
3.6 The Way to Today’s Baseline
3.7 MBOC(6,1)
4. GNSS Signal Structure
4.1 GNSS Modulation Schemes
4.2 Multilevel Coded Spreading Symbols (MCS)
4.3 Binary Coded Symbols (BCS)
4.4 Sinusoidal Multilevel Coded Symbol (SMCS) Signals
4.5 Generalized Multilevel Coded Symbols (GMCS)
4.6 CBCS Modulation definition and analysis of performance
4.7 MBOC modulation definition and analysis
4.8 Other Modulation Schemes
5. Spectral Separation Coefficient (SSC)
5.1 Definition
5.2 Derivation of analytical expressions
6. Spectral Separation Coefficients with data and non ideal codes
6.1 Analytical expressions when data is present
6.2 Computation of non-ideal Spectral Separation Coefficients
7. Signal Multiplex Techniques for GNSS
7.1 Introduction
7.2 Multiplexing Schemes
7.3 Linear Modulation (Spatial Combining)
7.4 Majority Signal Voting
7.5 Hard Limiting
7.6 Quadrature Product Sub-carrier Modulation
7.7 Coherent Adaptive Sub-Carrier Modulation (CASM) and Interplex
7.8 Intervoting (Interplex + Majority Voting
7.9 FDMA vs. CDMA
8. Conclusions and Recommendations
8.1 Conclusions
8.2 Recommendations for Future WorkNuméro de notice : 14903 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : PhD : aerospace engineering : Universität der Bundeswehr München : 2008 DOI : sans En ligne : http://athene-forschung.unibw.de/node?id=86167 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76793
Titre : On ground-based GPS tropospheric delay estimation : Vollständiger Abdruck der an der Fakultät für Bauingenieur- und Vermessungswesen der Universität der Bundeswehr München zur Erlangung des akademischen Grades eines Doktors der Ingenieurwissenschaften (Dr.-Ing.) eingereichten Dissertation Type de document : Thèse/HDR Auteurs : Torben Schüler, Auteur Editeur : Munich : Universität der Bundeswehr Année de publication : 2001 Importance : 364 p. Format : 21 x 30 cm Note générale : bibliographie
mémoire de docteur ingénieur de l'université de MunichLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] retard troposphériqueRésumé : (auteur) NAVSTAR GPS has become an important aid in navigation and precise space geodesy. Permanent tracking networks like the global IGS net of the International GPS Service for Geodynamics and regional densifications like the German Reference Frame GREF have become very valuable for many scientific applications. For parameter estimation in largescale networks, two major error sources have to be reduced, namely the orbit error of the GPS space vehicles and the propagation delay in the troposphere. In 1992, the IGS started to produce precise GPS orbits which became a standard product of high precision that virtually eliminated orbit uncertainties from the list of significant contributors to the overall error budget. The remaining problem is that of modeling wet delays with high precision. All conventional models have to fail in this task due to the impossibility of modeling wet delays solely from surface measurements like temperature and relative humidity. Actually, the non-hydrostatic component of the tropospheric propagation delay is highly influenced by the distribution of water vapor in the lower troposphere which cannot be sufficiently predicted with sole help of surface measurements. A work-around is to include atmospheric parameters as additional unknowns in the analysis of GPS data from permanent monitor stations that turns out to improve the quality of position estimates. Moreover, knowledge of zenith wet delays allows to obtain a highly interesting value for climatology and meteorology: integrated or precipitable water vapor being important for the energy balance of the atmosphere and holds share of more than 60% of the natural greenhouse effect. GPS can thereby contribute to the improvement of climate models and weather forecasting. This work outlines the application of ground-based GPS to climate research and meteorology without omitting the fact that precise GPS positioning can also highly benefit from using numerical weather models for tropospheric delay determination for applications where GPS troposphere estimation is not possible, for example kinematic and rapid static surveys. In this sense, the technique of GPS-derived tropospheric delays is seen as mutually improving both disciplines, precise positioning as well as meteorology and climatology. Chapters 1 to 4 constitute the theoretical part of this study with first introducing the reader to the importance of water vapor and tropospheric delays (Chapter 1) and outlining the principles of GPS data processing (Chapter 2) with special emphasis on tropospheric delay modeling (Chapter 3). Furthermore, a brief introduction to numerical weather models and extraction methods for needed data is given (Chapter 4) and approaches to combine both data sets - tropospheric delays from numerical weather fields and GPS delays - are described. Chapters 5 to 7 describe several experiments to validate and assess the quality of numerical weather model data (Chapter 5), GPS-derived troposphere propagation delays (Chapter 6) and combined solutions (Chapter 7). Finally, a summary of the application of ground-based GNSS for tropospheric delay estimation is given (Chapter 8). Note de contenu : 1- Introduction
2- Principles of GPS data processing
3- Modeling and estimating tropospheric propagation delays
4- Application of numerical weather models
5- Validation of numerical weather model data
6- GPS validation experiments
7- Quality assessment of TROPEX dataNuméro de notice : 14864 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : mémoire de docteur ingénieur : : Université de Munich : 2001 DOI : sans En ligne : https://athene-forschung.unibw.de/85240?id=85240 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75853
Titre : Untersuchung von GPS-Beobachtungen für kleinräumige geodätische Netze Titre original : [Recherche d'observations GPS pour les réseaux géodésiques dans un petit espace] Type de document : Monographie Auteurs : R. Hollmann, Auteur Editeur : Munich : Universität der Bundeswehr Année de publication : 2000 Collection : Schriftenreihe des Instituts für Geodäsie, ISSN 0173-1009 num. 69 Importance : 340 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] affaiblissement de la précision
[Termes IGN] ambiguïté entière
[Termes IGN] correction troposphérique
[Termes IGN] données GPS
[Termes IGN] équation linéaire
[Termes IGN] fiabilité des données
[Termes IGN] mesurage de phase
[Termes IGN] modèle de Gauss-Markov
[Termes IGN] phase GPS
[Termes IGN] précision du positionnement
[Termes IGN] propagation troposphérique
[Termes IGN] résidu
[Termes IGN] traitement de données GNSS
[Termes IGN] trajet multipleIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Numéro de notice : 68830 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62022 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 68830-01 30.61 Livre Centre de documentation Géodésie Disponible Datumsprobleme und stochastische Aspekte beim GPS-Nivellement für lokale Ingenieurnetze / D. Zhong (1997)
Titre : Datumsprobleme und stochastische Aspekte beim GPS-Nivellement für lokale Ingenieurnetze Titre original : Datum problems and stochastic aspects in GPS leveling for local engineering networks Type de document : Monographie Auteurs : D. Zhong, Auteur Editeur : Munich : Universität der Bundeswehr Année de publication : 1997 Collection : Schriftenreihe des Instituts für Geodäsie, ISSN 0173-1009 num. 58 Importance : 160 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] altitude orthométrique
[Termes IGN] compensation de coordonnées
[Termes IGN] modèle stochastique
[Termes IGN] positionnement par GPS
[Termes IGN] système de coordonnées
[Termes IGN] système de référence géodésique
[Termes IGN] transformation de coordonnéesIndex. décimale : 30.11 Transformation de coordonnées Résumé : (Auteur) With the wide use of the Global Positioning System (GPS) in geodetic positioning and engineering surveying, the research on combination models and methods for local terrestrial and satellite aided network observations has become one of the most fashionable and interesting tasks in the field of geodesy and engineering surveying. Considering especially the accurate determination of levelling heights with the help of GPS (GPS Levelling), the solution of this problem is critical to the exploitation of the full capacity of GPS for engineering surveying purposes.
The satellite aided observation results are coordinates of geometric nature in a geocentric coordinate system, while terrestrial network coordinates result from directions, zenith angles, spatial distances and height differences which are related to the gravity field. These two types of observations are different not only from their reference systems and datum information, but also from their height definitions. In order to combine these different heterogeneous observations to a homogeneous network, it is necessary to solve the following problems :
* hybrid datum problems : The different observation types contain different datum information which has to be unified for a consistent datum definition.
* The heterogeneous observations have different stochastic characteristics. To combine them optimally, a "correct" determination method of the stochastic model is to be found out.
* To combine different heights accurately, the influence of the local gravity field has to be studied and a local geoid model for the transformation between ellipsoidal GPS heights and terrestrial levelling heights has to be developed.
Only by solving these problems, it is possible to combine terrestrial and satellite aided network observations correctly and to achieve an accurate result. Different solution concepts for these problems are intensively discussed and studied by the means of theoretical considerations and practical numerical results. The principle solution concept is a synergetic integration of the adjustment results of different network observations (GPS-network, terrestrial network and information about local geoid). The numerical results of the practical adjustments of two engineering networks of high accuracy with different observation types show that the methods presented are efficient and significant to accuracy improvement of the combined adjustment results.Numéro de notice : 59257 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60542 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 59257-01 30.11 Livre Centre de documentation Géodésie Disponible
Titre : Ein dynamisches Fehlermodell für GPS Autokorrelationsempfänger Titre original : [Un modèle dynamique d'erreurs pour un récepteur GPS] Type de document : Monographie Auteurs : Bernd Eissfeller, Auteur Editeur : Munich : Universität der Bundeswehr Année de publication : 1997 Collection : Schriftenreihe des Instituts für Geodäsie, ISSN 0173-1009 num. 55 Importance : 178 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] autocorrélation
[Termes IGN] modèle mathématique
[Termes IGN] modèle physique
[Termes IGN] signal GPS
[Termes IGN] trajet multipleIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Numéro de notice : 63943 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61240 Exemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 63943-02 30.61 Livre Centre de documentation Géodésie Disponible 63943-01 30.61 Livre Centre de documentation Géodésie Disponible PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalink
