Descripteur
Documents disponibles dans cette catégorie (134)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
GNSS antenna orientation based on modification of received signal strengths / David Eugen Grimm (2012)
Titre : GNSS antenna orientation based on modification of received signal strengths Type de document : Thèse/HDR Auteurs : David Eugen Grimm, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2012 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 88 Importance : 148 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-33-8 Note générale : Bibliographie
Doctoral thesisLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] antenne GNSS
[Termes IGN] détection du signal
[Termes IGN] orientation
[Termes IGN] signal GNSSIndex. décimale : 30.70 Navigation et positionnement Résumé : (Editeur) This work presents a concept to determine the orientation of a single GNSS antenna. When the orientation of the antenna is known, the presented approach can also be used for detection of multipath and reflected signals as well as spoofing signals. The orientation of the antenna is calculated using the direction of arrival (DOA) of the satellites' signals. Because the DOAs of the satellites' signals are not detectable with a standard GNSS antenna, the directional antenna pattern of the ntenna used is modified. The antenna pattern is modified by partially covering the antenna with a material that attenuates the signals in the band spectrum of GNSS. The attenuating material is rotated above the antenna, thereby influencing the received signal strength of the different satel lites. The signal strength is indicated by the carrier-to-noise density C/N0. Analysing the C/N0 of different satellites allows determining the DOA of each satellite's signal in relation to the antenna. Knowing the satellites' positions from the broadcast ephemerides and the antenna position allows calculation of the antenna orientation as well as the theoretically expected DOAs. Based on the instant approach, the real DOA of each satellite's signal is determined. By comparing the expected DOAs with the real DOAs, multipath and reflected signals as well as spoofing signals are determinable. Excluding these signals from the position and orientation calculation can remove systematic biases and, therefore, improve the accuracy.
Knowledge of the orientation completes the positioning information and is necessary for navigation applications. For precise GNSS measurements, the orientation of the antenna must be known to implement correction models for the antenna phase centre offset (PCO) and phase centre variation (PCV). Under optimal conditions, orientation information with an uncertainty of 5 degrees is achievable after a 2-minute measurement while an orientation with an uncertainty below 1 degree is achievable by measuring for several hours. Under poor condition s, an uncertainty of 5 degrees is achievable as well; however, because of systematic influences, the uncertainty will not improve significantly over a longer measuring time. A comparison of the obtained orientation value to a reference value verifies the correctness of the concept.Note de contenu : 1 Introduction
1.1 Global Navigation Satellite Systems (GNSS).
1.2 Why Orientation?
1.3 Determination of Orientation by GNSS
1.4 Introducing the Term Orientation
1.5 North Direction and Terrestrial Reference System.
1.6 Outline of this Thesis.
2 State of the Art in GNSS Orientation Determination.
2.1 System Types
2.2 Description of the Effects and Concepts Used
2.3 Overview of Existing Methods and Systems
2.4 Chapter Conclusion
3 GNSS Antennas and Signals
3.1 Antennas
3.2 Antenna Fields
3.3 Antenna Characteristics
3.4 GNSS Antenna Types
3.5 Geodetic GNSS Antennas
3.6 GNSS Signals
3.7 Chapter Conclusion
4 Mathematical Models for Satellite Orbits
4.1 Broadcast Ephemerides, Almanac, and GPS Time
4.2 Orbit Calculation
4.3 Satellite Motion
4.4 Chapter Conclusion
5 Orientation Finding with NORDIS
5.1 Required Accuracy
5.2 Measurement Concept of NORDIS
5.3 Measuring System
5.4 Experimental Setup
5.5 Chapter Conclusion
6 Orientation Calculation
6.1 Periodic Model
6.2 Correlation Approach
6.3 Chapter Conclusion
7 Verification of the Results
7.1 Dependency of the Measuring Duration on the Orientation Uncertainty.
7.2 Verification of the Components
7.3 Chapter Conclusion
8 Conclusion and Outlook
8.1 Conclusion
8.2 Possible Use Cases
8.3 Possible Improvements of NORDIS
8.4 Limitations of NORDISNuméro de notice : 15702 Affiliation des auteurs : non IGN Autre URL associée : URL ETH Zurich Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : 10.3929/ethz-a-007597299 En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-88.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62765 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 15702-01 30.70 Livre Centre de documentation Géodésie Disponible GPS-derived orbits for the GOCE satellite / Heike Bock in Journal of geodesy, vol 85 n° 11 (November /2011)
[article]
Titre : GPS-derived orbits for the GOCE satellite Type de document : Article/Communication Auteurs : Heike Bock, Auteur ; Adrian Jäggi, Auteur ; U. Meyer, Auteur ; P. Visser, Auteur ; et al., Auteur Année de publication : 2011 Article en page(s) : pp 807 - 818 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales
[Termes IGN] antenne GPS
[Termes IGN] GOCE
[Termes IGN] orbite basse
[Termes IGN] orbitographie
[Termes IGN] orbitographie par GNSS
[Termes IGN] positionnement cinématique
[Termes IGN] série temporelle
[Termes IGN] télémétrie laser sur satelliteRésumé : (Auteur) The first ESA (European Space Agency) Earth explorer core mission GOCE (Gravity field and steady-state Ocean Circulation Explorer) was launched on 17 March 2009 into a sun-synchronous dusk–dawn orbit with an exceptionally low initial altitude of about 280 km. The onboard 12-channel dual-frequency GPS (Global Positioning System) receiver delivers 1 Hz data, which provides the basis for precise orbit determination (POD) for such a very low orbiting satellite. As part of the European GOCE Gravity Consortium the Astronomical Institute of the University of Bern and the Department of Earth Observation and Space Systems are responsible for the orbit determination of the GOCE satellite within the GOCE High-level Processing Facility. Both quick-look (rapid) and very precise orbit solutions are produced with typical latencies of 1 day and 2 weeks, respectively. This article summarizes the special characteristics of the GOCE GPS data, presents POD results for about 2 months of data, and shows that both latency and accuracy requirements are met. Satellite Laser Ranging validation shows that an accuracy of 4 and 7 cm is achieved for the reduced-dynamic and kinematic Rapid Science Orbit solutions, respectively. The validation of the reduced-dynamic and kinematic Precise Science Orbit solutions is at a level of about 2 cm. Numéro de notice : A2011-469 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0484-9 Date de publication en ligne : 26/05/2011 En ligne : https://doi.org/10.1007/s00190-011-0484-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31363
in Journal of geodesy > vol 85 n° 11 (November /2011) . - pp 807 - 818[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2011111 RAB Revue Centre de documentation En réserve L003 Disponible Space-time equalization techniques for new GNSS signals / P. Anantharamu in GPS world, vol 22 n° 10 (October 2011)
[article]
Titre : Space-time equalization techniques for new GNSS signals Type de document : Article/Communication Auteurs : P. Anantharamu, Auteur ; Daniele Borio, Auteur ; Gérard Lachapelle, Auteur Année de publication : 2011 Article en page(s) : pp 36 - 41 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] antenne GNSS
[Termes IGN] données spatiotemporelles
[Termes IGN] signal GNSS
[Termes IGN] traitement du signalRésumé : (Auteur) Spatial and temporal information of signals received from multiple antennas can be applied to mitigate the impact of new GPS and Galileo signal's binary-offset sub-carrier, reducing multipath and interference effects. Numéro de notice : A2011-419 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31198
in GPS world > vol 22 n° 10 (October 2011) . - pp 36 - 41[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 067-2011101 RAB Revue Centre de documentation En réserve L003 Disponible Multipath minimization method: mitigation through adaptive filtering for machine automation applications / L. Serrano in GPS world, vol 22 n° 7 (July 2011)
[article]
Titre : Multipath minimization method: mitigation through adaptive filtering for machine automation applications Type de document : Article/Communication Auteurs : L. Serrano, Auteur ; D. Kim, Auteur ; R. Langley, Auteur Année de publication : 2011 Article en page(s) : pp 42 - 48 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal
[Termes IGN] antenne GNSS
[Termes IGN] appariement de formes
[Termes IGN] filtrage du rayonnement
[Termes IGN] guidage de véhicules
[Termes IGN] phase GPS
[Termes IGN] trajet multipleRésumé : (Auteur) [...] The best way to reduce the effects of multipath is to try avoiding it in the first place by siting the receiver's antenna as low as possible and far away from potential reflectors. But that's not always feasible. [...] At a static site, with an unchanging multipath environment, the signal reflection geometry repeats day to day and the effect of multipath can be reduced by sidereal filtering or "stacking" of coordinate or carrier-phase-residual time series. However, this approach is not viable for scenarios where the receiver and antenna are moving such as in machine control applications. Here an alternative approach is needed. In this month's column, I am joined by two of my UNB colleagues as we look at a technique that uses a pair of antennas on a moving vehicle together with a sophisticated mathematical model, to reduce the level of multipath on carrier-phase observations and thereby improve the accuracy of the vehicle's position. Numéro de notice : A2011-326 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31105
in GPS world > vol 22 n° 7 (July 2011) . - pp 42 - 48[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 067-2011071 RAB Revue Centre de documentation En réserve L003 Disponible GNSS inside mobile phones: GPS, GLONASS, QZSS and SBAS in a single chip / Franck Van Diggelen in Inside GNSS, vol 6 n° 2 (March - April 2011)
[article]
Titre : GNSS inside mobile phones: GPS, GLONASS, QZSS and SBAS in a single chip Type de document : Article/Communication Auteurs : Franck Van Diggelen, Auteur ; C. Abraham, Auteur ; J. De Salas, Auteur ; R. Silva, Auteur Année de publication : 2011 Article en page(s) : 10 p. ; pp 50 - 60 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] antenne GNSS
[Termes IGN] canyon urbain
[Termes IGN] filtrage du signal
[Termes IGN] géonavigateur
[Termes IGN] navigation automobile
[Termes IGN] puce
[Termes IGN] récepteur GNSS
[Termes IGN] téléphonie mobile
[Termes IGN] trajet multipleRésumé : (Auteur) Development of multiple GNSS satellite constellations, including regional and augmentation systems, has raised new and commercially strategic questions for product designers and system integrators. Are additional satellite signals sufficiently beneficial to include in receiver design? What are the product development issues associated with technical differences among GNSS systems? Can they be successfully addressed in single-die receiver chip designs? Numéro de notice : A2011-582 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.insidegnss.com/node/2507 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33506
in Inside GNSS > vol 6 n° 2 (March - April 2011) . - 10 p. ; pp 50 - 60[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 159-2011021 SL Revue Centre de documentation Revues en salle Disponible The civilian battlefield protecting GNSS receivers from interference and jamming / M. Jones in Inside GNSS, vol 6 n° 2 (March - April 2011)PermalinkEtalonnage des satellites GPS pour l'ITRF2008 / Xavier Collilieux (2011)PermalinkAn inter-comparison of zenith tropospheric delays derived from DORIS and GPS data / Olivier Bock in Advances in space research, vol 46 n° 12 (15/12/2010)Permalink3D SAR simulation of urban areas based on detailed building models / Stefan Auer in Photogrammetric Engineering & Remote Sensing, PERS, vol 76 n° 12 (December 2010)PermalinkRecord, Replay, Rewind : Testing GNSS Receivers with Record and Playback Techniques / D. Hall in GPS world, vol 21 n° 10 (October 2010)PermalinkThe celestial mechanics approach : theoretical foundations / Gerhard Beutler in Journal of geodesy, vol 84 n° 10 (October 2010)PermalinkGPS IIF-1 satellite: Antenna phase center and attitude modeling / F. Dilssner in Inside GNSS, vol 5 n° 6 (September 2010)PermalinkEstimation of phase center corrections for GLONASS-M satellite antennas / F. Dilssner in Journal of geodesy, vol 84 n° 8 (August 2010)PermalinkConnaître le sous-sol avant d'aménager / M. Simiar in Géomètre, n° 2070 (mai 2010)PermalinkGPSENSOR monitoring system in China / H. Zhang in GEO: Geoconnexion international, vol 9 n° 4 (april 2010)Permalink