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Analysis of the DORIS contributions to ITRF2008 / Detlef Angermann in Advances in space research, vol 46 n° 12 (15/12/2010)
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Titre : Analysis of the DORIS contributions to ITRF2008 Type de document : Article/Communication Auteurs : Detlef Angermann, Auteur ; Manuela Seitz, Auteur ; Hermann Drewes, Auteur Année de publication : 2010 Article en page(s) : pp 1633 - 1647 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données DORIS
[Termes IGN] International DORIS Service
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] positionnement par DORIS
[Termes IGN] série temporelle
[Termes IGN] station DORISRésumé : (Auteur) In its function as an ITRS Combination Centre, DGFI is in charge with the computation of an ITRF2008 solution. The computation methodology of DGFI is based on the combination of datum-free normal equations (weekly or session data sets, respectively) of station positions and Earth orientation parameters (EOP) from the geodetic space techniques DORIS, GPS, SLR and VLBI. In this paper we focus on the DORIS part within the ITRF2008 computations. We present results obtained from the analysis of the DORIS time series for station positions, network translation and scale parameters, as well as for the terrestrial pole coordinates. The submissions to ITRF2008 benefit from improved analysis strategies of the seven contributing IDS analysis centres and from a combination of the weekly solutions of station positions and polar motion. The results show an improvement by a factor of two compared to past DORIS data submitted to ITRF2005, which has been evaluated by investigating the repeatabilities of position time series. The DORIS position time series were analysed w.r.t. discontinuities and other non-linear effects such as seasonal variations. About 40 discontinuities have been identified which have been compared with the results of an earlier study. Within the inter-technique combination we focus on the DORIS contribution to the integration of the different space geodetic observations and on a comparison of the geodetic local ties with the space geodetic solutions. Results are given for the 41 co-location sites between DORIS and GPS. Numéro de notice : A2010-567 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.07.018 En ligne : https://doi.org/10.1016/j.asr.2010.07.018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30759
in Advances in space research > vol 46 n° 12 (15/12/2010) . - pp 1633 - 1647[article]Categorization of permanent GNSS reference stations / A. Kenyeres in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)
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Titre : Categorization of permanent GNSS reference stations Type de document : Article/Communication Auteurs : A. Kenyeres, Auteur Année de publication : 2010 Article en page(s) : pp 375 - 390 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] réseau géodésique permanent
[Termes IGN] station de réception
[Termes IGN] station de référence
[Termes IGN] station GNSSRésumé : (Auteur) The global reference frame realizations (as ITRFyy) (International Terrestrial Reference Frame), the corresponding IGSyy (International GNSS Service) and their regional densification solutions are published as SSC (Set of Station Coordinates and velocities) and SINEX files, where each of the included stations are treated in the same way and the coordinates refer to a single common epoch. Although these realizations are considered the actually best solution, it does not mean that all involved stations have the same level of reliability. The only product quality indicators are the uncertainties rendered to the coordinates and velocities, therefore the users must pay special regard to avoid distortions in the actual applications. In this paper, the separation and categorization of the reference stations is proposed. The categorization is based on the analysis of series of consecutive cumulative solution, where the convergence of the velocity estimates is considered as main categorization criteria. Class_A includes the reliable fiducial stations with long observation series (at least one years of recent data) and "consolidated" velocity parameters. Class_B mostly covers young sites, which not yet fulfilling the criteria for being fiducial station, and those may only be used for solution control. The Class_B stations also have high quality cumulative coordinates, referred to the epoch of minimum variance, which is different at each site, however no velocities are published. The main target of the proposed categorization/separation is not the exclusion of any reference sites, rather the estimation of the optimal (earliest) epoch for a recently installed stations, from when it can be used as geodetic reference. The categorization criteria and the related terms are described and discussed in the paper. This approach is successfully implemented for the EPN (EUREF Permanent Network). We found that as of January 2010 about 80% of the EPN stations can be considered as Class_A, and more than 50, recently installed stations are still not offered as fiducial for reference frame applications. The categorization is revised in each 15 weeks, and these stations are moved to Class_A, when they fulfilling the respective criteria. The presented approach is straightforward and can easily be extended both to global and national long term GNSS solutions. Numéro de notice : A2010-605 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31338
in Bulletin of geodesy and geomatics BGG > vol 69 n° 2 - 3 (December 2010) . - pp 375 - 390[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Hellenic terrestrial reference system 2007 (HTRS07): a regional realization of ETRS89 over Greece in support of HEPOS / K. Katsampalos in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)
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Titre : Hellenic terrestrial reference system 2007 (HTRS07): a regional realization of ETRS89 over Greece in support of HEPOS Type de document : Article/Communication Auteurs : K. Katsampalos, Auteur ; Christopher Kotsakis, Auteur ; M. Gianniou, Auteur Année de publication : 2010 Article en page(s) : pp 329 - 347 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] compensation par moindres carrés
[Termes IGN] European Terrestrial Reference System 1989
[Termes IGN] Grèce
[Termes IGN] HEPOS
[Termes IGN] précision décimétrique
[Termes IGN] station permanente
[Termes IGN] système de référence local
[Termes IGN] transformation de coordonnéesRésumé : (Auteur) An overview of a regional realization of ETRS89 over the area of Greece is presented in this paper. The underlying project is related to the recent establishment of the Hellenic Positioning System (HEPOS), a GPS-based spatial positioning service using a network of 98 continuously operating reference stations located in Greece and operated by KTIMATOLOGIO S.A. The data analysis procedure that was followed for the least-squares adjustment of the HEPOS network is described, along with the adopted methodology for the datum definition and its alignment with the ETRS89/ETRF05 reference frame. The paper presents also a combined transformation model that was concurrently developed for the connection between the official Hellenic Geodetic Reference System 1987 (HGRS87) and the Hellenic Terrestrial Reference System 2007 (HTRS07), where the latter identifies the ETRS89/ETRF05-based frame that underlies the operation of HEPOS. The results obtained from the evaluation of the aforementioned model, at 2430 geodetic benchmarks throughout Greece, revealed an accuracy level that is better than 10 cm in terms of the rms value for the total horizontal transformation error. Numéro de notice : A2010-497 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31336
in Bulletin of geodesy and geomatics BGG > vol 69 n° 2 - 3 (December 2010) . - pp 329 - 347[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013-2010021 RAB Revue Centre de documentation En réserve L003 Disponible Monitoring of official national ETRF coordinates on EPN web project for the EUREF TWG [technical working group] / Elmar Brockmann in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)
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Titre : Monitoring of official national ETRF coordinates on EPN web project for the EUREF TWG [technical working group] Type de document : Article/Communication Auteurs : Elmar Brockmann, Auteur Année de publication : 2010 Article en page(s) : pp 246 - 256 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] Europe (géographie politique)
[Termes IGN] European Terrestrial Reference Frame
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] réseau permanent EUREFRésumé : (Auteur) The EUREF Permanent Network EPN is permanently analyzed by different analysis centers in order to density the international reference frame ITRF and in order to monitor the European reference frame ETRF. Furthermore, the different European countries adopted realizations of the ETRF in the past years and decades. The described project of the EUREF technical working group (TWG) shows for a sub-set of 14 European countries, how homogeneous the different national reference frames are realized compared to a consistently computed multi-annual solution published by EUREF in Dec., 2008. A collection of all officially used national ETRF coordinates for the EPN stations and its publication on the EPN web pages is a by-product of this project. Numéro de notice : A2010-598 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31342
in Bulletin of geodesy and geomatics BGG > vol 69 n° 2 - 3 (December 2010) . - pp 246 - 256[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 013-2010021 RAB Revue Centre de documentation En réserve L003 Disponible On improving precision of GPS-derived height times series at GEONET stations / H. Munekane in Bulletin of the GeoSpatial Information authority of Japan, vol 58 (December 2010)
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Titre : On improving precision of GPS-derived height times series at GEONET stations Type de document : Article/Communication Auteurs : H. Munekane, Auteur Année de publication : 2010 Article en page(s) : pp 39 - 46 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] altitude
[Termes IGN] Japon
[Termes IGN] positionnement par GPS
[Termes IGN] réseau géodésique local
[Termes IGN] série temporelle
[Termes IGN] station permanenteRésumé : (Auteur) This paper summarizes the effect of various noises on GEONET height times series and demonstrates how the state-of-art analysis technique can improve its quality with the results evaluated by simulations and actual observations. Three factors that may affect the GPS-derived height time series are investigated: 1) mismodeling of atmospheric delays; 2) load deformation by the atmosphere; and 3) load deformation by the ocean. It is found that : 1) the use of the conventional mapping functions that are used in the current GEONET routine analysis may introduce spurious annual height variations up to 3 mm, and these spurious signals can be considerably mitigated with the use of mapping functions based on numerical weather models; 2) annual height variations caused by the atmospheric loading are up to 3 mm ; and 3) the annual variations caused by oceanic loading deformation get larger toward the south, reaching 3 mm in the Nansei Islands. It confirmed that when corrections are applied in the GPS analysis of GEONET data, the annual height variations of GEONET stations are largely reduced. Hence, it may now be possible to detect even these small movements related to the earthquake/volcanic activities that were formally obscured by the annual height noises, offering a hope that more accurate disaster prevention information could be provided. Numéro de notice : A2010-580 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : https://www.gsi.go.jp/common/000058372.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30771
in Bulletin of the GeoSpatial Information authority of Japan > vol 58 (December 2010) . - pp 39 - 46[article]Results and comparisons of a local and a regional reprocessed GNSS network / Juliette Legrand in Bulletin of geodesy and geomatics BGG, vol 69 n° 2 - 3 (December 2010)
PermalinkPermalinkContributions of the French Institut Géographique National (IGN) to the International DORIS Service / Pascal Willis in Advances in space research, vol 45 n° 12 (15/06/2010)
PermalinkGSFC DORIS contribution to ITRF2008 / Karine Le Bail in Advances in space research, vol 45 n° 12 (15/06/2010)
PermalinkQuality assessment of the IDS contribution to ITRF2008 / Zuheir Altamimi in Advances in space research, vol 45 n° 12 (15/06/2010)
PermalinkNetwork adjustment in surveying engineering: linear goal programming versus least squares / S. Alp in SaLIS Surveying and land information science, vol 70 n° 1 (Spring 2010)
PermalinkRelation between the Italian and European height systems / Alessandro Caporali in Bulletin of geodesy and geomatics BGG, vol 69 n° 1 (March 2010)
PermalinkImpact of loading effects on determination of the International Terrestrial Reference Frame / Xavier Collilieux in Advances in space research, vol 45 n° 1 ([04/01/2010])
PermalinkPermalinkGlobal optimization of core station networks for space geodesy: application to the referencing of the SLR EOP with respect to ITRF / David Coulot in Journal of geodesy, vol 84 n° 1 (January 2010)
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