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scientifique

GLONASS fractional-cycle bias estimation across inhomogeneous receivers for PPP ambiguity resolution / Jianghui Geng in Journal of geodesy, vol 90 n° 4 (April 2016)  

Public [article]  inJournal of geodesy > vol 90 n° 4 (April 2016) . - pp 379 - 396 Titre : GLONASS fractional-cycle bias estimation across inhomogeneous receivers for PPP ambiguity resolution Type de document : Article/Communication Auteurs : Jianghui Geng, Auteur ; Yehuda Bock, Auteur Année de publication : 2016 Article en page(s) : pp 379 - 396 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] positionnement par GLONASS [Termes IGN] positionnement ponctuel précis [Termes IGN] résolution d'ambiguïté Résumé : (auteur) The key issue to enable precise point positioning with ambiguity resolution (PPP-AR) is to estimate fractional-cycle biases (FCBs), which mainly relate to receiver and satellite hardware biases, over a network of reference stations. While this has been well achieved for GPS, FCB estimation for GLONASS is difficult because (1) satellites do not share the same frequencies as a result of Frequency Division Multiple Access (FDMA) signals; (2) and even worse, pseudorange hardware biases of receivers vary in an irregular manner with manufacturers, antennas, domes, firmware, etc., which especially complicates GLONASS PPP-AR over inhomogeneous receivers. We propose a general approach where external ionosphere products are introduced into GLONASS PPP to estimate precise FCBs that are less impaired by pseudorange hardware biases of diverse receivers to enable PPP-AR. One month of GLONASS data at about 550 European stations were processed. From an exemplary network of 51 inhomogeneous receivers, including four receiver types with various antennas and spanning about 800 km in both longitudinal and latitudinal directions, we found that 92.4 % of all fractional parts of GLONASS wide-lane ambiguities agree well within ±0.15 cycles with a standard deviation of 0.09 cycles if global ionosphere maps (GIMs) are introduced, compared to only 51.7 % within ±0.15 cycles and a larger standard deviation of 0.22 cycles otherwise. Hourly static GLONASS PPP-AR at 40 test stations can reach position estimates of about 1 and 2 cm in RMS from ground truth for the horizontal and vertical components, respectively, which is comparable to hourly GPS PPP-AR. Integrated GLONASS and GPS PPP-AR can further achieve an RMS of about 0.5 cm in horizontal and 1–2 cm in vertical components. We stress that the performance of GLONASS PPP-AR across inhomogeneous receivers depends on the accuracy of ionosphere products. GIMs have a modest accuracy of only 2–8 TECU (Total Electron Content Unit) in vertical which confines PPP-AR to an approximately 800×800 km area in Europe. We expect that a regional ionosphere map with a better than 1 TECU accuracy is likely to improve the GLONASS PPP-AR efficiency. Numéro de notice : A2016-251 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-015-0879-0 Date de publication en ligne : 26/12/2015 En ligne : https://doi.org/10.1007/s00190-015-0879-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80759 [article]

Triple-frequency GPS precise point positioning with rapid ambiguity resolution / Jianghui Geng in Journal of geodesy, vol 87 n° 5 (May 2013)  

Public [article]  inJournal of geodesy > vol 87 n° 5 (May 2013) . - 460 p. ; pp 449 - 460 Titre : Triple-frequency GPS precise point positioning with rapid ambiguity resolution Type de document : Article/Communication Auteurs : Jianghui Geng, Auteur ; Yehuda Bock, Auteur Année de publication : 2013 Article en page(s) : 460 p. ; pp 449 - 460 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] modulation de fréquence [Termes IGN] positionnement ponctuel précis [Termes IGN] récepteur trifréquence [Termes IGN] résolution d'ambiguïté Résumé : (Auteur) At present, reliable ambiguity resolution in real-time GPS precise point positioning (PPP) can only be achieved after an initial observation period of a few tens of minutes. In this study, we propose a method where the incoming triple-frequency GPS signals are exploited to enable rapid convergences to ambiguity-fixed solutions in real-time PPP. Specifically, extra-wide-lane ambiguity resolution can be first achieved almost instantaneously with the Melbourne-Wübbena combination observable on L2 and L5. Then the resultant unambiguous extra-wide-lane carrier-phase is combined with the wide-lane carrier-phase on L1 and L2 to form an ionosphere-free observable with a wavelength of about 3.4 m. Although the noise of this observable is around 100 times the raw carrier-phase noise, its wide-lane ambiguity can still be resolved very efficiently, and the resultant ambiguity-fixed observable can assist much better than pseudorange in speeding up succeeding narrow-lane ambiguity resolution. To validate this method, we use an advanced hardware simulator to generate triple-frequency signals and a high-grade receiver to collect 1-Hz data. When the carrier-phase precisions on L1, L2 and L5 are as poor as 1.5, 6.3 and 1.5 mm, respectively, wide-lane ambiguity resolution can still reach a correctness rate of over 99 % within 20 s. As a result, the correctness rate of narrow-lane ambiguity resolution achieves 99 % within 65 s, in contrast to only 64 % within 150 s in dual-frequency PPP. In addition, we also simulate a multipath-contaminated data set and introduce new ambiguities for all satellites every 120 s. We find that when multipath effects are strong, ambiguity-fixed solutions are achieved at 78 % of all epochs in triple-frequency PPP whilst almost no ambiguities are resolved in dual-frequency PPP. Therefore, we demonstrate that triple-frequency PPP has the potential to achieve ambiguity-fixed solutions within a few minutes, or even shorter if raw carrier-phase precisions are around 1 mm. In either case, we conclude that the efficiency of ambiguity resolution in triple-frequency PPP is much higher than that in dual-frequency PPP. Numéro de notice : A2013-255 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0619-2 Date de publication en ligne : 22/02/2013 En ligne : https://doi.org/10.1007/s00190-013-0619-2 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32393 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-2013051	SL	Revue	Centre de documentation	Revues en salle	Disponible

Development of data infrastructure to support scientific analysis for the International GNSS Service / Carey E. Noll in Journal of geodesy, vol 83 n° 3-4 (March - April 2009)  

Public [article]  inJournal of geodesy > vol 83 n° 3-4 (March - April 2009) . - pp 309 - 325 Titre : Development of data infrastructure to support scientific analysis for the International GNSS Service Type de document : Article/Communication Auteurs : Carey E. Noll, Auteur ; Yehuda Bock, Auteur ; H. Habrich, Auteur ; Angelyn Moore, Auteur Année de publication : 2009 Article en page(s) : pp 309 - 325 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] données GNSS [Termes IGN] International GNSS Service [Termes IGN] orbitographie [Termes IGN] positionnement par GNSS [Termes IGN] répartition géographique [Termes IGN] secteur terrien [Termes IGN] station de poursuite Résumé : (Auteur) The International GNSS Service provides data and products to support a wide range of global, multidisciplinary scientific research. The service has established a hierarchy of components to facilitate its mission: a globally distributed network of Tracking Stations, Data Centers, Analysis Centers, a Central Bureau, and a Governing Board. The Data Centers, in conjunction with the Central Bureau, serve as the primary means of distributing GNSS data, products, and general information to the user community through ftp and Web servers and email services. The requirements of analysis centers and the scientific community have evolved over the lifetime of the IGS, requiring enhancement and extension of the supporting data center infrastructure. The diversity of IGS data and products extends today from the realm of the real-time and near real-time to the long-term archive and thus forms a basis for multidisciplinary research spanning decades. Reliability of all components is a key requirement within the IGS and is accomplished through the geographic distribution of data centers and the creation of independent, redundant, parallel channels for the transmission of data and products. We discuss the development of the IGS data infrastructure, current status, and plans for future enhancements. Descriptions of IGS data and products and associated metadata are also included. Copyright Springer Numéro de notice : A2009-196 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0245-6 En ligne : https://doi.org/10.1007/s00190-008-0245-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29826 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-09031	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Global Positioning System : an overview / Yehuda Bock (1990)  

Public Titre : Global Positioning System : an overview : IAG symposium, Edinburgh, Scotland, August 7-8, 1989 Type de document : Actes de congrès Auteurs : Yehuda Bock, Éditeur scientifique ; Norman Leppard, Éditeur scientifique Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 1990 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 102 Conférence : IAG 1989, 125th general meeting & IAG symposia 03/08/1989 12/08/1989 Edimbourg Royaume-Uni Importance : 447 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-0-387-97266-4 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] déformation de la croute terrestre [Termes IGN] DORIS [Termes IGN] Global Positioning System [Termes IGN] GPS en mode cinématique [Termes IGN] positionnement cinématique [Termes IGN] trajet multiple Index. décimale : CG1989 Actes de congrès en 1989 Numéro de notice : 67631 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes DOI : 10.1007/978-1-4615-7111-7 En ligne : https://doi.org/10.1007/978-1-4615-7111-7 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=37127

Contient

• The DORIS satellite radio tracking system: status and plans / Claude Boucher (1989)  
• High precision kinematic positioning using GPS at the IGN : recent results / Pascal Willis (1989)  

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
67631-01	CG.89	Livre	Centre de documentation	En réserve M-103	Disponible

On the time delay weight matrix in VLBI geodetic parameter estimation / Yehuda Bock (1983)

Public Titre : On the time delay weight matrix in VLBI geodetic parameter estimation Type de document : Monographie Auteurs : Yehuda Bock, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1983 Collection : Department of Geodetic Science and Surveying Reports num. 348 Importance : 28 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] interférométrie à très grande base Index. décimale : 30.63 Télémétrie laser sur satellite, Télémétrie laser sur lune, VLBI Résumé : (Auteur) The spatial correlation between VLBI observables obtained from simultaneous observations at several stations are examined, specifically those that result from the common station in each two-baseline (three-station) cross-correlation of the received radio signals. It is found that the correlations are negligible and need not to be considered in constructing the time delay weight matrix in VLBI geodetic parameter estimation. Numéro de notice : 57904 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60312

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
57904-01	30.63	Livre	Centre de documentation	Géodésie	Disponible

The use of baseline measurements and geophysical models for the estimation of crustal deformations and the terrestrial reference system / Yehuda Bock (1982)

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