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Effects of thermosphere total density pertubations on LEO Orbits during severe geomagnetic conditions (Oct-Nov 2003) using Doris and SLR data / Florent Deleflie in Advances in space research, vol 36 n° 3 (March 2005)
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Titre : Effects of thermosphere total density pertubations on LEO Orbits during severe geomagnetic conditions (Oct-Nov 2003) using Doris and SLR data Type de document : Article/Communication Auteurs : Florent Deleflie, Auteur ; François Barlier, Auteur ; Yoaz E. Bar-Sever, Auteur ; L.J. Romans, Auteur ; Pascal Willis , Auteur
Année de publication : 2005 Article en page(s) : pp 522 - 533 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] bruit blanc
[Termes IGN] données DORIS
[Termes IGN] filtrage du bruit
[Termes IGN] géomagnétisme
[Termes IGN] orbite basse
[Termes IGN] orbitographie
[Termes IGN] télémétrie laser sur satellite
[Termes IGN] tempête magnétique
[Termes IGN] thermosphèreRésumé : (Auteur) An exceptional solar activity event occurred at the end of October 2003. On October 29th, seven groups of sunspots were visible on the Sun's surface and the geomagnetic index Kp reached the extreme value of 9, leading to beautiful auroras, among other effects. Similar events also occurred in November 2003. These events have been an exceptional opportunity to estimate effects of the thermosphere total density perturbations in extreme conditions on a Low Earth Orbit (LEO orbit corresponding in this study at altitudes ranging from 800 km up to 1400 km). Specifically, we study the best way to get reliable geodetic products even during such solar events, and how well the thermosphere models (DTM78, DTM94, DTM2000, and MSIS86 models) allow us to accomplish this and to predict the observed perturbations on the orbital elements. Thus our analysis is twofold. First, we have computed orbits of satellites equipped with the onboard DORIS tracking system, at an altitude ranging from 800 to 1330 km and for periods of time including these exceptional events (October 2931 and November 20, 2003). We have computed 30hour arc orbits, estimating the drag coefficient parameter very frequently (every minute) using a tight randomwalk constraint or using a white noise reset in the Gipsy/Oasis software. We show that significant errors are obtained for the considered thermosphere models, but can be greatly improved. using a more sophisticated data processing. We also investigated how these proposed processing strategies affect the quality of the DORIS geodetic products. Significant improvements were found for weekly stations coordinates estimations as well as for polar motion determination.
In addition, we have investigated the global quality of the modeling of the variations of the mean orbital elements in using thermosphere models over long periods of time including such severe geomagnetic events. This original approach is based on averaging techniques implemented in the CODIOR software. We have analysed the continuous longterm evolution of the semimajor axis of the geodetic satellites Starlette, Stella and Ajisai tracked by the Satellite Laser Ranging (SLR) network. In this second part, we give: (i) a single global empirical coefficient per satellite, to validate the models over the whole duration of the orbital arc, including the exceptional solar activity events, and (ii) one coefficient per a period of about 2 months to quantify the seasonal differences between the models and the observations.
As a result of both investigations, we compare the capability of recent models of thermosphere to allow us to get reliable geodetic products and mean orbital elements variations over short and long periods of time as well as for the recent exceptional geomagnetic events. Different altitudes are considered: around 800900 km for the Stella and Starlette satellites tracked by laser ranging systems and SPOT tracked by DORIS; around also 13001400 km for the Ajisai satellite tracked by laser techniques and TOPEX and Jason also tracked by DORIS. It appears in our study that laser and DORIS data are complementary to probe the thermosphere, and to test the quality of thermosphere models in specific conditions for getting accurate geodetic products.Numéro de notice : A2005-611 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2005.03.029 Date de publication en ligne : 13/04/2005 En ligne : https://doi.org/10.1016/j.asr.2005.03.029 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33947
in Advances in space research > vol 36 n° 3 (March 2005) . - pp 522 - 533[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 38017-01 30.82 Tiré à part Centre de documentation Géodésie Disponible High-resolution current field mapping from aircraft and satellites: the potential of along-track SAR interferometry / R. Romeiser in Geoinformatics, vol 8 n° 2 (01/03/2005)
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Titre : High-resolution current field mapping from aircraft and satellites: the potential of along-track SAR interferometry Type de document : Article/Communication Auteurs : R. Romeiser, Auteur Année de publication : 2005 Article en page(s) : pp 30 - 33 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] courant marin
[Termes IGN] image radar moirée
[Termes IGN] instrument aéroporté
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] SRTM
[Termes IGN] TerraSAR-XRésumé : (Auteur) The along-track interferometric synthetic aperture radar (along-track InSAR) technique for mapping ocean currents at high spatial resolution from aircraft or satellites was introduced in the late 1980's. Since then, hardware and algorithms have been improved in the course of many projects and experiments. Airborne InSARs are now available for routine surveys. Current measurements from space could be demonstrated with data acquired from a Space Shuttle in february 2000. A first civilian satellite offering along-track InSAR capabilities over some longer period will become available in 2006. Numéro de notice : A2005-122 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27260
in Geoinformatics > vol 8 n° 2 (01/03/2005) . - pp 30 - 33[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 262-05021 SL Revue Centre de documentation Revues en salle Disponible
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Titre : New moon rising Type de document : Article/Communication Auteurs : M. Bedford, Auteur Année de publication : 2005 Article en page(s) : pp 51 - 53 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] coût
[Termes IGN] Galileo
[Termes IGN] orbitographie
[Termes IGN] valeur ajoutéeRésumé : (Documentaliste) L'article développe les objectifs et les moyens du système Galileo. Numéro de notice : A2005-095 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27233
in GEO:connexion > vol 4 n° 3 (march 2005) . - pp 51 - 53[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 062-05031 RAB Revue Centre de documentation En réserve L003 Disponible Terrestrial Reference Frames effects on global sea level rise determination from Topex-Poseidon altimetric data / Laurent Morel in Advances in space research, vol 36 n° 3 (March 2005)
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Titre : Terrestrial Reference Frames effects on global sea level rise determination from Topex-Poseidon altimetric data Type de document : Article/Communication Auteurs : Laurent Morel, Auteur ; Pascal Willis , Auteur
Année de publication : 2005 Article en page(s) : pp 358 - 368 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] données altimétriques
[Termes IGN] incertitude des données
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] niveau moyen des mers
[Termes IGN] orbitographie
[Termes IGN] repère de référenceRésumé : (Auteur) Over the past years, satellite altimetry has produced several significant improvements in our scientific understanding of the oceans. However, several results related to global or regional sea level changes still too often rely on the assumption that orbit errors coming from station coordinates adoption can be neglected in the total error budget. The goal of this paper is to specifically study this general assumption and to assess its limitation. In a first step, in the case of the TOPEX/Poseidon satellite, we first characterized orbital errors coming from the adoption of a specific Terrestrial Reference Frame using a MonteCarlobased simulation method using DORIS data. In a second step, we analysed the effect of these systematic orbital errors on the mean sea level derived from altimeter data. From these results, we derived linear transfer functions that can be used for several purposes like error budget estimation in altimetry or local tic specifications for the implementation of new tracking stations. These simulations show that the main source of errors comes from current imprecision in the Zaxis realization of the frame. A 10 mm error in the TZ realization can create a 1.2 mm of systematic errors in the derived mean sea level due to the NorthSouth asymmetric distribution of the oceans A over the world. Significant sea level rise could erroneously be attributed to a possible warming of the biosphere while they just come from systematic errors in the Terrestrial Reference Frame used to generate the satellite operational orbits. Finally, we assessed the accuracy of present Terrestrial Reference Frame realizations and derived a realistic error budget for this specific source of error. For the ITRF97 realization, a current precision of 3.0 mm in sea level and 0.37 mm/yr in sea level rise was obtained. These precisions should gradually improve with future Terrestrial Reference Frame realizations. Numéro de notice : A2005-602 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2005.05.113 Date de publication en ligne : 25/07/2005 En ligne : https://doi.org/10.1016/j.asr.2005.05.113 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33907
in Advances in space research > vol 36 n° 3 (March 2005) . - pp 358 - 368[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 38017-01 30.82 Tiré à part Centre de documentation Géodésie Disponible Columbus: ready for the international space station / B. Patti in ESA bulletin, n° 121 (February 2005)
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Titre : Columbus: ready for the international space station Type de document : Article/Communication Auteurs : B. Patti, Auteur ; R. Chesson, Auteur ; M. Zell, Auteur ; A. Thirkettle, Auteur Année de publication : 2005 Article en page(s) : pp 46 - 51 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Technologies spatiales
[Termes IGN] charge utile
[Termes IGN] station spatiale internationaleRésumé : (Auteur) One of the key contributions to the development and operation of the International Space Station (ISS) is ESA's Colombus Laboratory Module. It will be transported to the ISS, together with its payload complement, on Space Shuttle Assembly Flight 1E in 2006. Colombus's readiness for launch requires the availability not only of the module itself, but also three other major elements being provided by ESA, namely : The Ground Segment, consisting of the Colombus Control Centre and the User Support and Operations Centres (USOCs), the Operations products, and the Crew Training. Numéro de notice : A2005-115 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.esa.int/esapub/bulletin/bulletin121/bul121f_patti.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27253
in ESA bulletin > n° 121 (February 2005) . - pp 46 - 51[article]Tsunami en Asie : le raz-de-marée des images satellites / Françoise de Blomac in SIG la lettre, n° 64 (février 2005)
PermalinkCalcul de l'allongement troposphérique via l'utilisation de cartes de l'ECMWF / Samuel Nahmani (2005)
PermalinkPermalinkPermalinkRadarsat-2 to be launched in 2005: features and applications of Canada's second SAR satellite / K. Stephens in GIM international, vol 19 n° 1 (January 2005)
PermalinkPermalinkSpatial resolution and processing tradeoffs for HYDROS: application of reconstruction and resolution enhancement techniques / David G. Long in IEEE Transactions on geoscience and remote sensing, vol 43 n° 1 (January 2005)
PermalinkA review of satellite and airborne sensors for remote sensing based detection of minefields and landmines / B.H. Maathuis in International Journal of Remote Sensing IJRS, vol 25 n° 23 (December 2004)
PermalinkFour years of Landsat-7 on orbit geometric calibration and performance / D. Scott Lee in IEEE Transactions on geoscience and remote sensing, vol 42 n° 12 (December 2004)
PermalinkLandsat-7 ETM+ on-orbit reflective-band radiometric stability and absolute calibration / B.L. Markham in IEEE Transactions on geoscience and remote sensing, vol 42 n° 12 (December 2004)
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