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Galileo down to the millimeter: analyzing a GIOVE-A-B double difference / Christian Tiberius in Inside GNSS, vol 3 n° 6 (September 2008) 

Public [article]  inInside GNSS > vol 3 n° 6 (September 2008) . - 5 p. ; pp 40 - 44 Titre : Galileo down to the millimeter: analyzing a GIOVE-A-B double difference Type de document : Article/Communication Auteurs : Christian Tiberius, Auteur ; Hans van der Marel, Auteur ; Jean-Marie Sleewaegen, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : 5 p. ; pp 40 - 44 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] constellation Galileo [Termes IGN] données Galileo [Termes IGN] double différence [Termes IGN] phase GNSS [Termes IGN] résolution d'ambiguïté [Termes IGN] traitement de données GNSS Résumé : (Editeur) With only two spacecraft in orbit for the Galileo constellation that will eventually have 30 satellites, having enough observation time to track and analyze the new signals can pose a challenge. Using a short baseline set-up and a late-night session, however, these authors were able to collect simultaneous measurements from both satellites, perform a double-difference resolution of the carrier phase cycle ambiguity, and assess the measurement noise. Copyright Gibbons Media & Research LLC Numéro de notice : A2008-680 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33532 [article]

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Handheld GPS receiver accuracy: standard positioning service / Christian Tiberius in GPS world, vol 14 n° 2 (February 2003)

Public [article]  inGPS world > vol 14 n° 2 (February 2003) . - pp 46 - 51 Titre : Handheld GPS receiver accuracy: standard positioning service Type de document : Article/Communication Auteurs : Christian Tiberius, Auteur Année de publication : 2003 Article en page(s) : pp 46 - 51 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] positionnement par GPS [Termes IGN] précision du positionnement [Termes IGN] récepteur GPS Résumé : (Auteur) Officially, the Global Positioning System has two levels of service: the Precise Positioning Service (PPS) which is afforded to the United States military, allied military forces and some other U.S. government agencies, and the Standard Positioning Service (SPS), available to all users worldwide. Currently, the SPS is provided by way of the Coarse/Acquisition (C/A) 1.023 megachip per sec-ond pseudorandom noise (PRN) code on the CPS LI frequency at 1575.42 MHz. The vast majority of GPS receivers now in existence, including virtually all civil-use handheld receivers, are SPS receivers which determine their positions by tracking the LI C/A-code. SPS policy initially dictated a predictable positioning accuracy of 100 meters, at the 95 per-cent confidence level, horizontally and 156 meters (95 percent) vertically. SPS positioning accuracy was purposely degraded to this level through the use of Selective Availability (SA). When SA was removed on May 2, 2000, SPS accuracy improved greatly, approaching that of the PPS. Copyright Questex Media Group Inc Numéro de notice : A2003-436 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=26516 [article]

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067-03021	SL	Revue	Centre de documentation	Revues en salle	Disponible

0,99999999 confidence ambiguity resolution with GPS and Galileo / Christian Tiberius in GPS solutions, vol 6 n° 1-2 (November 2002)  

Public [article]  inGPS solutions > vol 6 n° 1-2 (November 2002) . - pp 96 - 99 Titre : 0,99999999 confidence ambiguity resolution with GPS and Galileo Type de document : Article/Communication Auteurs : Christian Tiberius, Auteur ; B. Pany, Auteur ; Bernd Eissfeller, Auteur ; P. Joosten, Auteur ; Sandra Verhagen, Auteur Année de publication : 2002 Article en page(s) : pp 96 - 99 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] ambiguïté entière [Termes IGN] constellation GPS [Termes IGN] Galileo [Termes IGN] Global Positioning System [Termes IGN] positionnement différentiel [Termes IGN] résolution d'ambiguïté [Termes IGN] secteur spatial Résumé : (Auteur) In this short contribution, it is demonstrated how integer carrier phase cycle ambiguity resolution will perform in near future, when the US GPS gets modernized and the european Galileo becomes operational. The capability of ambiguity resolution is analyzed in the context of precise differential positioning over short, medium and long distances. Starting from dual-frequency operation with GPS at present, particularly augmenting the number of satellites turns out to have beneficial consequences on the capability of correctly resolving the ambiguities. With a "double" constellation, on short baselines, the confidence of the integer ambiguity solution increases to a level of 0,99999999 or beyond. Numéro de notice : A2002-310 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-002-0022-6 En ligne : https://doi.org/10.1007/s10291-002-0022-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22221 [article]

Real-time kinematic in the light of GPS modernisation and Galileo / B. Eisfeller in Galileo's world, vol 4 n° 2 (01/09/2002)

Public [article]  inGalileo's world > vol 4 n° 2 (01/09/2002) . - pp 28 - 34 Titre : Real-time kinematic in the light of GPS modernisation and Galileo Type de document : Article/Communication Auteurs : B. Eisfeller, Auteur ; Christian Tiberius, Auteur ; T. Pany, Auteur ; G. Heinrichs, Auteur Année de publication : 2002 Article en page(s) : pp 28 - 34 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] GalileoSat [Termes IGN] Global Navigation Satellite System [Termes IGN] Global Positioning System [Termes IGN] positionnement cinématique en temps réel [Termes IGN] précision [Termes IGN] récepteur mixte Résumé : (Auteur) Planned modernization of the U.S. Global Positioning System (GPS) and the development of the European Galileo system will substantially increase the signals available to the GNSS user community. This will bring numerous benefits for applications requiring fast and precise positioning. This article discusses some of the implications for receiver and software design and for instantaneous ambiguity-resolution techniques. "Understanding Galileo" is a regular column that explores the science and technology behind satellite-based positioning, navigation, and timing systems in general and proposed Galileo system in particular. Numéro de notice : A2002-255 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22166 [article]

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
15355-01	30.61	Revue	Centre de documentation	Géodésie	Disponible

Recursive data processing for kinematic GPS surveying / Christian Tiberius (1998)  

Public Titre : Recursive data processing for kinematic GPS surveying Type de document : Thèse/HDR Auteurs : Christian Tiberius, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 1998 Collection : Netherlands Geodetic Commission Publications on Geodesy, ISSN 0165-1706 num. 45 Importance : 247 p. Format : 21 x 29 cm ISBN/ISSN/EAN : 978-90-6132-265-8 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] ambiguïté entière [Termes IGN] compensation Lambda [Termes IGN] contrôle qualité [Termes IGN] correction du signal [Termes IGN] double différence [Termes IGN] fiabilité des données [Termes IGN] GPS en mode cinématique [Termes IGN] modèle mathématique [Termes IGN] modèle stochastique [Termes IGN] phase GPS [Termes IGN] précision des mesures [Termes IGN] traitement de données GNSS Index. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (auteur) Through the concept of interferometry and using carrier phase measurements, relative positions can be determined very precisely with the Global Positioning System GPS. Carrier phase measurements are made by phase comparison of the generated and received carrier. Due to this technique, an unknown integer number of cycles (ambiguity) is involved in these measurements. Resolving the ambiguities is the key to precise GPS positioning. When the integer (double difference) ambiguities have been successfully resolved, the precision of the relative position is at the 1 cm level or better. The ambiguities are dealt with by the LAMBDA method, the Least-squares AMBiguity Decorrelation Adjustment method, which was introduced in 1993. It features a strict extension of standard least-squares to the integer domain and by the decorrelating reparametrization of the ambiguities, the integer estimation can be made very fast and efficiently. Ambiguity resolution is possible instantaneously, thus based on only one epoch of data, and hence truely On-The-Fly. In kinematic GPS surveying, the roving receiver visits the locations to be surveyed. This set up allows a high productivity in collecting geometric information. It is convenient to obtain the results of the data processing already in the field while the survey is run, instead of at the home office one day later. In case of insufficient quality, corrective actions can then be taken immediately in the field. The data processing must therefore be recursive. As mechanization the Square Root Information Filter is applied. The SRIF allows estimation and quality control computations to be made in recursion and thus possibly in real-time, in close parallel with the gathering of the data. The quality control comprises the Detection, Identification and Adaptation of errors in the incoming data (outliers, cycle slips). By the DlA-procedure, the effect of the errors on the estimates for the unknown parameters of interest, the coordinates of the rover, is directly removed. The data of three GPS measurement campaigns are processed and analysed. The quality, in terms of precision and reliability, of the coordinate estimators is considered for various measurement scenarios. Practical results, the positioning performance and the capability of resolving the ambiguities, are given for a kinematic experiment. In conclusion is kinematic GPS, as a measurement technique, very well suited for surveying applications. The mathematical model for GPS surveying, or positioning in general, that is currently in use, turns out to be a rough one, and must be further sophisticated. It limits the receiver interdistance to the typical short baseline length (-10 km). Shortcomings of the functional model that show up, when high demands are put on the quality of the positioning results, are explored. Refinements of the functional model concern differential atmospheric delay parameters (ionospheric and tropospheric). In addition, (phase) multipath is still a matter of concern. GPS code and phase observables are extensively analysed; an inventory of refinements to the stochastic model is made, and includes elevation dependence, cross-correlation and mutual (channel) correlation. Numéro de notice : 66719 Affiliation des auteurs : non IGN Autre URL associée : Complément Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : sans En ligne : https://www.ncgeo.nl/downloads/45Tiberius_1.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61651

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The lambda method for integer ambiguity estimation / P.J. de Jonge (1993)

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Quality control and integration aspects of vehicle locations systems / Christian Tiberius (1991)

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