Descripteur
Documents disponibles dans cette catégorie (347)
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
The celestial mechanics approach: application to data of the GRACE mission / Gerhard Beutler in Journal of geodesy, vol 84 n° 11 (November 2010)
[article]
Titre : The celestial mechanics approach: application to data of the GRACE mission Type de document : Article/Communication Auteurs : Gerhard Beutler, Auteur ; Adrian Jäggi, Auteur ; L. Mervart, Auteur Année de publication : 2010 Article en page(s) : pp 661 - 681 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] bande K
[Termes IGN] données GPS
[Termes IGN] données GRACE
[Termes IGN] mécanique céleste
[Termes IGN] orbitographieRésumé : (Auteur) The celestial mechanics approach (CMA) has its roots in the Bernese GPS software and was extensively used for determining the orbits of high-orbiting satellites. The CMA was extended to determine the orbits of Low Earth Orbiting satellites (LEOs) equipped with GPS receivers and of constellations of LEOs equipped in addition with inter-satellite links. In recent years, the CMA was further developed and used for gravity field determination. The CMA was developed by the Astronomical Institute of the University of Bern (AIUB). The CMA is presented from the theoretical perspective in (Beutler et al. 2010). The key elements of the CMA are illustrated here using data from 50 days of GPS, K-Band, and accelerometer observations gathered by the Gravity Recovery And Climate Experiment (GRACE) mission in 2007. We study in particular the impact of (1) analyzing different observables [Global Positioning System (GPS) observations only, inter-satellite measurements only], (2) analyzing a combination of observations of different types on the level of the normal equation systems (NEQs), (3) using accelerometer data, (4) different orbit parametrizations (short-arc, reduced-dynamic) by imposing different constraints on the stochastic orbit parameters, and (5) using either the inter-satellite ranges or their time derivatives. The so-called GRACE baseline, i.e., the achievable accuracy of the GRACE gravity field for a particular solution strategy, is established for the CMA. Numéro de notice : A2010-477 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0402-6 Date de publication en ligne : 21/08/2010 En ligne : https://doi.org/10.1007/s00190-010-0402-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30670
in Journal of geodesy > vol 84 n° 11 (November 2010) . - pp 661 - 681[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2010111 SL Revue Centre de documentation Revues en salle Disponible The celestial mechanics approach : theoretical foundations / Gerhard Beutler in Journal of geodesy, vol 84 n° 10 (October 2010)
[article]
Titre : The celestial mechanics approach : theoretical foundations Type de document : Article/Communication Auteurs : Gerhard Beutler, Auteur ; Adrian Jäggi, Auteur ; L. Mervart, Auteur ; U. Meyer, Auteur Année de publication : 2010 Article en page(s) : pp 605 - 624 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] antenne GPS
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] constellation GPS
[Termes IGN] mécanique orbitale
[Termes IGN] orbitographieRésumé : (Auteur) Gravity field determination using the measurements of Global Positioning receivers onboard low Earth orbiters and inter-satellite measurements in a constellation of satellites is a generalized orbit determination problem involving all satellites of the constellation. The celestial mechanics approach (CMA) is comprehensive in the sense that it encompasses many different methods currently in use, in particular so-called short-arc methods, reduced-dynamic methods, and pure dynamic methods. The method is very flexible because the actual solution type may be selected just prior to the combination of the satellite-, arc- and technique-specific normal equation systems. It is thus possible to generate ensembles of substantially different solutions - essentially at the cost of generating one particular solution. The article outlines the general aspects of orbit and gravity field determination. Then the focus is put on the particularities of the CMA, in particular on the way to use accelerometer data and the statistical information associated with it. Numéro de notice : A2010-417 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0401-7 Date de publication en ligne : 24/08/2010 En ligne : https://doi.org/10.1007/s00190-010-0401-7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30610
in Journal of geodesy > vol 84 n° 10 (October 2010) . - pp 605 - 624[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2010101 SL Revue Centre de documentation Revues en salle Disponible Precision orbit determination standards for the Jason series of altimeter missions / L. Cerri in Marine geodesy, vol 33 suppl 1 (August 2010)
[article]
Titre : Precision orbit determination standards for the Jason series of altimeter missions Type de document : Article/Communication Auteurs : L. Cerri, Auteur ; Jean-Paul Berthias, Auteur ; Willy I. Bertiger, Auteur ; Bruce J. Haines, Auteur ; F. Lemoine, Auteur ; F. Mercier, Auteur ; J.C. Ries, Auteur ; Pascal Willis , Auteur ; Nikita P. Zelensky, Auteur ; Marek Ziebart, Auteur Année de publication : 2010 Article en page(s) : pp 379 - 418 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales
[Termes IGN] distorsion radiale
[Termes IGN] Jason
[Termes IGN] mission spatiale
[Termes IGN] orbitographieRésumé : (Auteur) The Jason-1 altimeter satellite and its follow-on mission Jason-2/OSTM were launched in December 2001 and June 2008, respectively, to provide the scientific community with a high-accuracy continuous record of observations of the ocean surface topography. Both missions carry on board three state-of-the-art tracking systems (DORIS, GPS, SLR) to meet the requirement of better-than-1.5 cm radial accuracy for the operational orbit included in the geophysical data record (GDR) product.
This article outlines the common set of models and processing techniques applied to both Jason reprocessed and operational orbits included in version C of the GDR, referred to as GDR-C standards for precision orbit determination (POD), and describes the systematic components of the radial error budget that are of most interest for the altimeter data analysts. The nonsystematic component of the error budget, quantified by intercomparison of orbits using similar models or with reduced dependency on the dynamic models, is generally at or below 7 mm RMS (root-mean-square). In particular, the average daily RMS of the radial difference between the JPL and CNES reduced-dynamic orbits on Jason-2 is below 6 mm. Concerning the dynamic models employed, the principal contributors to residual systematic differences appear to be the time varying gravity and solar radiation pressure, resulting in geographically correlated periodic signals that have amplitudes at the few-mm level. Concerning the drifts of the orbits along the North/South direction, all solutions agree to better than the 1 mm/year level.Numéro de notice : A2010-642 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01490419.2010.488966 Date de publication en ligne : 09/08/2010 En ligne : https://doi.org/10.1080/01490419.2010.488966 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90716
in Marine geodesy > vol 33 suppl 1 (August 2010) . - pp 379 - 418[article]GSFC DORIS contribution to ITRF2008 / Karine Le Bail in Advances in space research, vol 45 n° 12 (15/06/2010)
[article]
Titre : GSFC DORIS contribution to ITRF2008 Type de document : Article/Communication Auteurs : Karine Le Bail , Auteur ; Franck G. Lemoine, Auteur ; Douglas S. Chinn, Auteur Année de publication : 2010 Article en page(s) : pp 1481 - 1499 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données DORIS
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orbitographie
[Termes IGN] orientation de la TerreRésumé : (Auteur) The NASA GSFC DORIS analysis center has provided weekly DORIS solutions from November 1992 to January 2009 (839 SINEX files) of station positions and Earth Orientation Parameters for inclusion in the DORIS contribution to ITRF2008. The NASA GSFC GEODYN orbit determination software was used to process the orbits and produce the normal equations. The weekly SINEX gscwd10 submissions included DORIS data from Envisat, TOPEX/Poseidon, SPOT-2, SPOT-3, SPOT-4, SPOT-5. The orbits were mostly seven days in length (except for weeks with data gaps or maneuvers). The processing used the GRACE-derived EIGEN-GL04S1 gravity model, updated modeling for time-variable gravity, the GOT4.7 ocean tide model and tuned satellite-specific macromodels for SPOT-2, SPOT-3, SPOT-4, SPOT-5 and TOPEX/Poseidon. The University College London (UCL) radiation pressure model for Envisat improves nonconservative force modeling for this satellite, reducing the median residual empirical daily along-track accelerations from 3.75 * 10-9 m/s2 with the a priori macromodel to 0.99 * 10-9 m/s2 with the UCL model. For the SPOT and Envisat DORIS satellite orbits from 2003 to 2008, we obtain average RMS overlaps of 0.8–0.9 cm in the radial direction, 2.1–3.4 cm cross-track, and 1.7–2.3 cm along-track. The RMS orbit differences between Envisat DORIS-only and SLR & DORIS orbits are 1.1 cm radially, 6.4 cm along-track and 3.7 cm cross-track and are characterized by systematic along-track mean offsets due to the Envisat DORIS system time bias of 15–10 ?s. We obtain a good agreement between the geometrically-determined geocenter parameters and geocenter parameters determined dynamically from analysis of the degree one terms of the geopotential. The intrinsic RMS weekly position repeatability with respect to the IDS-3 combination ranges from 2.5 to 3.0 cm in 1993–1994 to 1.5 cm in 2007–2008. Numéro de notice : A2010-362 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.01.030 En ligne : http://dx.doi.org/doi/10.1016/j.asr.2010.01.030 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30556
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1481 - 1499[article]Quality assessment of the IDS contribution to ITRF2008 / Zuheir Altamimi in Advances in space research, vol 45 n° 12 (15/06/2010)
[article]
Titre : Quality assessment of the IDS contribution to ITRF2008 Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur Année de publication : 2010 Article en page(s) : pp 1500 - 1509 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données DORIS
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orbitographie
[Termes IGN] qualité des données
[Termes IGN] série temporelleRésumé : (Auteur) Doppler Orbitography Radiopositionning Integrated by Satellite (DORIS) is one of the four fundamental techniques contributing to the ITRF. The optimal coverage over the globe of the DORIS observing sites and sites co-located with GPS, allow a strong embedding of DORIS within the ITRF network. DORIS contributes to the access to ITRF through precise orbit determination of altimetric satellites with onboard DORIS receivers. The DORIS contribution to the ITRF2008 is enhanced by the fact that the solutions of seven analysis centers were included in the submitted combined time series of weekly station positions and daily polar motion. We evaluate the quality of the DORIS combined solution in terms of its agreement with the other techniques (VLBI, SLR, GPS) contributing to the ITRF2008 combination. We show in particular that the precisions of the current IDS products range between 1.5 to 2.6 mm for station positions (at the epochs of minimum variances); better than 1 mm/yr in velocities and between 170 and 260 micro-arc-seconds for polar motion, a significant improvement by a factor of three to five, compared to past data used in the ITRF2005 combination. This improvement is certainly due to improved analysis strategies employed by the seven IDS analysis centers that contributed to the combined weekly submitted solutions of station positions and polar motion. A spectral analysis of DORIS station height time series indicates that annual and semi-annual signals are dominant. However, TOPEX draconitic period of about 118 days is still detected in about 20% of the station position power spectra. DORIS height annual signals correlate well with GPS annual signal estimated at some co-located stations, which show that DORIS technique is able to detect loading signals. Numéro de notice : A2010-363 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.03.010 Date de publication en ligne : 15/03/2010 En ligne : https://doi.org/10.1016/j.asr.2010.03.010 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30557
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1500 - 1509[article]The international DORIS service (IDS): toward maturity / Pascal Willis in Advances in space research, vol 45 n° 12 (15/06/2010)PermalinkGlobal gravity field determination using the GPS measurements made onboard the low Earth orbiting satellite CHAMP / Lars Prange (2010)PermalinkSciences of geodesy, vol 1. Advanced and future directions / Guochang Xu (2010)PermalinkDetermination and analysis of stations coordinates based on Starlette and Lageos-1 & -2 satellites laser ranging data / Bachir Gourine in Bulletin des sciences géographiques, n° 24 (Septembre 2009)PermalinkAn improved empirical model for the effect of long-period ocean tides on polar motion / Richard S. Gross in Journal of geodesy, vol 83 n° 7 (July 2009)PermalinkMaking sense of inter-signal corrections: accounting for GPS satellite calibration parameters in legacy and modernized ionosphere correction algorithms / Avram Tetewsky in Inside GNSS, vol 4 n° 4 (July - August 2009)PermalinkWhere is GIOVE-A exactly? Using microwaves and laser ranging for precise orbit determination / Erik Schönemann in GPS world, vol 20 n° 7 (July 2009)PermalinkDevelopment 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)PermalinkThe International Global navigation satellite systems Service (IGS): development and achievements / Gerhard Beutler in Journal of geodesy, vol 83 n° 3-4 (March - April 2009)Permalinkvol 83 n° 3-4 - March - April 2009 - The International GNSS Service (IGS) in a changing landscape of Global Navigation Satellite Systems (Bulletin de Journal of geodesy) / R. KleesPermalink