Centre de documentation
scientifique

Dépouillements

Testing of Global Pressure-Temperature (GPT) Model and Global Mapping Function (GMF) in GPS analyses / Jan Kouba 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 199 - 208 Titre : Testing of Global Pressure-Temperature (GPT) Model and Global Mapping Function (GMF) in GPS analyses Type de document : Article/Communication Auteurs : Jan Kouba, Auteur Année de publication : 2009 Article en page(s) : pp 199 - 208 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] analyse comparative [Termes IGN] données GPS [Termes IGN] données météorologiques [Termes IGN] modèle atmosphérique [Termes IGN] modèle météorologique [Termes IGN] positionnement par GPS [Termes IGN] positionnement ponctuel précis [Termes IGN] pression atmosphérique [Termes IGN] propagation du signal [Termes IGN] température Résumé : (Auteur) Several sources of a priori meteorological data have been compared for their effects on geodetic results from GPS precise point positioning (PPP). The new global pressure and temperature model (GPT), available at the IERS Conventions web site, provides pressure values that have been used to compute a priori hydrostatic (dry) zenith path delay z h estimates. Both the GPT-derived and a simple height-dependent a priori constant z h performed well for low- and mid-latitude stations. However, due to the actual variations not accounted for by the seasonal GPT model pressure values or the a priori constant z h, GPS height solution errors can sometimes exceed 10 mm, particularly in Polar Regions or with elevation cutoff angles less than 10 degrees. Such height errors are nearly perfectly correlated with local pressure variations so that for most stations they partly (and for solutions with 5-degree elevation angle cutoff almost fully) compensate for the atmospheric loading displacements. Consequently, unlike PPP solutions utilizing a numerical weather model (NWM) or locally measured pressure data for a priori z h, the GPT-based PPP height repeatabilities are better for most stations before rather than after correcting for atmospheric loading. At 5 of the 11 studied stations, for which measured local meteorological data were available, the PPP height errors caused by a priori z h interpolated from gridded Vienna Mapping Function-1 (VMF1) data (from a NWM) were less than 0.5 mm. Height errors due to the global mapping function (GMF) are even larger than those caused by the GPT a priori pressure errors. The GMF height errors are mainly due to the hydrostatic mapping and for the solutions with 10-degree elevation cutoff they are about 50% larger than the GPT a priori errors. Copyright Springer Numéro de notice : A2009-194 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0229-6 En ligne : https://doi.org/10.1007/s00190-008-0229-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29824 [article]

Exemplaires(1)

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

The International Global navigation satellite systems Service (IGS): development and achievements / Gerhard Beutler 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 297 - 307 Titre : The International Global navigation satellite systems Service (IGS): development and achievements Type de document : Article/Communication Auteurs : Gerhard Beutler, Auteur ; A.W. Moore, Auteur ; Ivan I. Mueller, Auteur Année de publication : 2009 Article en page(s) : pp 297 - 307 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] effet atmosphérique [Termes IGN] Global Navigation Satellite System [Termes IGN] International Earth Rotation Service [Termes IGN] International GNSS Service [Termes IGN] orbitographie [Termes IGN] positionnement par GPS [Termes IGN] réseau géodésique terrestre Résumé : (Auteur) Since 21 June 1992 the International GPS Service (IGS), renamed International GNSS Service in 2005, produces and makes available uninterrupted time series of its products, in particular GPS observations from the IGS Global Network, GPS orbits, Earth orientation parameters (components x and y of polar motion, length of day) with daily time resolution, satellite and receiver clock information for each day with different latencies and accuracies, and station coordinates and velocities in weekly batches for further analysis by the IERS (International Earth Rotation and Reference Systems Service). At a later stage the IGS started exploiting its network for atmosphere monitoring, in particular for ionosphere mapping, for troposphere monitoring, and time and frequency transfer. This is why new IGS products encompass ionosphere maps and tropospheric zenith delays. This development became even more important when more and more space-missions carrying space-borne GPS for various purposes were launched. This article offers an overview for the broader scientific community of the development of the IGS and of the spectrum of topics addressed today with IGS data and products. Copyright Springer Numéro de notice : A2009-195 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0268-z En ligne : https://doi.org/10.1007/s00190-008-0268-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29825 [article]

Exemplaires(1)

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

Monitoring storm-enhanced density using IGS reference station data / Anthea Coster 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 345 - 351 Titre : Monitoring storm-enhanced density using IGS reference station data Type de document : Article/Communication Auteurs : Anthea Coster, Auteur ; S. Skone, Auteur Année de publication : 2009 Article en page(s) : pp 345 - 351 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] GPS en mode différentiel [Termes IGN] International GNSS Service [Termes IGN] ionosphère [Termes IGN] positionnement cinématique en temps réel [Termes IGN] prévention des risques [Termes IGN] tempête magnétique [Termes IGN] traitement de données GNSS Résumé : (Auteur) Storm-enhanced density (SED) is a geomagnetic storm phenomenon, characterized by a plume of enhanced total electron content (TEC) that initially moves poleward and sunward extending out from a larger region of enhanced TEC in the mid-latitudes. SED is associated with extreme mid-latitude space weather effects. Sharp gradients in the TEC are found along the borders of SED plumes and at the boundaries of the larger TEC region (the base of the plume). These large TEC gradients can cause significant errors in DGPS and WADGPS positioning and can result in serious consequences for applications such as railway control, highway traffic management, emergency response, commercial aviation and marine navigation, all of which require high precision, real-time positioning. Data from the global IGS network of GPS receivers have enabled the spatial and temporal visualization of these SED plumes, allowing ionospheric researchers to study this phenomenon and investigate the potential for developing prediction techniques and real-time warning systems. GPS TEC maps provided by analysis of the data from the IGS network have now been widely disseminated throughout the atmospheric research community and have become one of the standard means of studying the effects of geomagnetic storms on the ionosphere. These maps have enabled researchers to identify that the SED phenomenon occurs globally, is associated with large TEC gradients (at times greater than 100 TEC units per degree latitude), and is a magnetically conjugate phenomenon. This paper reports on the recent advances in our understanding of the SED phenomenon enabled by GPS observations. Copyright Springer Numéro de notice : A2009-197 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0272-3 En ligne : https://doi.org/10.1007/s00190-008-0272-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29827 [article]

Exemplaires(1)

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

IGS contribution to the ITRF / Zuheir Altamimi 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 375 - 383 Titre : IGS contribution to the ITRF Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur Année de publication : 2009 Article en page(s) : pp 375 - 383 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] centre de phase [Termes IGN] International Terrestrial Reference Frame [Termes IGN] positionnement par GPS [Termes IGN] série temporelle Résumé : (auteur) We examine the contribution of the International GNSS Service (IGS) to the International Terrestrial Reference Frame (ITRF) by evaluating the quality of the incorporated solutions as well as their major role in the ITRF formation. Starting with the ITRF2005, the ITRF is constructed with input data in the form of time series of station positions (weekly for satellite techniques and daily for VLBI) and daily Earth Orientation Parameters. Analysis of time series of station positions is a fundamental first step in the ITRF elaboration, allowing to assess not only the stations behavior, but also the frame parameters and in particular the physical ones, namely the origin and the scale. As it will be seen, given the poor number and distribution of SLR and VLBI co-location sites, the IGS GPS network plays a major role by connecting these two techniques together, given their relevance for the definition of the origin and the scale of the ITRF. Time series analysis of the IGS weekly combined and other individual Analysis Center solutions indicates an internal precision (or repeatability) Numéro de notice : A2009-581 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-008-0294-x En ligne : https://doi.org/10.1007/s00190-008-0294-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88650 [article]

Exemplaires(1)

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