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Where is GIOVE-A exactly? Using microwaves and laser ranging for precise orbit determination / Erik Schönemann in GPS world, vol 20 n° 7 (July 2009)
[article]
Titre : Where is GIOVE-A exactly? Using microwaves and laser ranging for precise orbit determination Type de document : Article/Communication Auteurs : Erik Schönemann, Auteur ; Tim A. Springer, Auteur ; R. Langley, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 42 - 50 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] constellation Galileo
[Termes IGN] GIOVE (satellite)
[Termes IGN] orbitographie
[Termes IGN] télémétrie laser sur satelliteRésumé : (Auteur) We use them for listening to music, for routine surgeries, for making a point in a presentation, and even for hanging pictures straight. Of course, I'm talking about lasers. Invented in 1960, the laser (an acronym for light amplification by the stimulated emission of radiation) has become ubiquitous in modem society. Every CD and DVD player has one. Many printers use them. But lasers are also used in a wide range of industrial and scientific applications including determining the orbits of satellites through satellite laser ranging (SLR). In the SLR technique, pulses of laser light from a ground reference station are directed at satellites equipped with an array of coner-cube retroreflectors, which direct the pulses back towards a collocated receiving, telescope. By accurately measuring the two-way travel times of the pulses and knowing location of the station and other operating parameters, the positions of the satellites can be determined. A network of SLR reference stations around the globe is used to monitor the orbits of satellites over time and their variations have been used by scientists to improve our knowledge of the Earth's gravity field ; to study the long term dynamics of the solid Earth, oceans, and atmosphere; and even to verify predictions of the General Theory of Relativity. The first SLR measurements were obtained from the Beacon Explorer-B satellite which launched in october 1964. Since then, dozens of satellite equipped with corner-cube retroreflectors have been launched including a number of radio-navigation satellites. Every GLONASS satellite is equipped with retroreflectors and two GPS satellite have been equipped - SVN35/PRN05 and SVN36/PNR06. The COMPASS-M1 satellite in medium earth orbit carries retroreflectors, as do both GIOVE-A and -B, the Galileo test satellites. Precise orbit determination of radio-navigation satellites using SLR has the advantage of being unaffected by any onboard satellite electronics and associated signal biases. Radiometric observations of a satellite's microwave signals, on the other hand, are influenced by the satellite's clock, for example, and its effect must be estimated to obtain precise (and accurate) satellite orbits for navigation and positioning. Therefore, a comparison of SLR-and microwave derived orbits can be very useful for studying the performance of the data measurement and orbit-determination processes of both techniques. In this month's column, we take a look at some work being carried out to precisely determine the orbit of the GIOVE-A test satellite using SLR and microwave observations. This preliminary investigation will benefit the procedures to be implemented for the future Galileo constellation. Copyright Questex Media Group Numéro de notice : A2009-282 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29912
in GPS world > vol 20 n° 7 (July 2009) . - pp 42 - 50[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-09071 SL Revue Centre de documentation Revues en salle Disponible SPOT image tourné vers l'avenir / Françoise de Blomac in SIG la lettre, n° 108 (juin 2009)
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Titre : SPOT image tourné vers l'avenir Type de document : Article/Communication Auteurs : Françoise de Blomac, Auteur Année de publication : 2009 Article en page(s) : pp 10 - 12 Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de télédétection
[Termes IGN] image SPOT
[Termes IGN] partenariat
[Termes IGN] Référence-3D
[Termes IGN] satellite d'observation de la TerreRésumé : (Auteur) SPOT Image a rassemblé mi-juin ses principaux clients et partenaires du monde entier, pour deux jours de conférences à Toulouse. C'est en industriel incontournable de l'observation de la Terre que l'entreprise toulousaine s'est présentée, multipliant les annonces et les présentations de nouveaux services, devant plusieurs centaines de personnes. Copyright SIG La Lettre Numéro de notice : A2009-226 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29856
in SIG la lettre > n° 108 (juin 2009) . - pp 10 - 12[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 286-09061 RAB Revue Centre de documentation En réserve L003 Disponible TerraSAR-X and TanDEM-X: Revolution in spaceborne radar / F. Hensler in Bulletin des sciences géographiques, n° 23 (juin 2009)
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Titre : TerraSAR-X and TanDEM-X: Revolution in spaceborne radar Type de document : Article/Communication Auteurs : F. Hensler, Auteur ; M. Weber, Auteur Année de publication : 2009 Article en page(s) : pp 57 - 63 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image radar et applications
[Termes IGN] base de données localisées
[Termes IGN] image à haute résolution
[Termes IGN] image radar
[Termes IGN] image TanDEM-X
[Termes IGN] image TerraSAR-X
[Termes IGN] TanDEM-X
[Termes IGN] temps réel
[Termes IGN] TerraSAR-XRésumé : (Auteur) Commercially available imagery is and will remain indispensable to civilian and military organizations gathering various types of geo-spatial information. Whether fulfilling international agreements, providing military contingents in international peacekeeping or humanitarian missions, or conducting joint technical exercises with other countries - a reliable access to timely, high resolution remote sensing data is an essential basis for well-informed decision making, particularly in time-critical situations. Today, organizations with those needs customarily resort to high resolution data acquired by optical sensors - often a lengthy operation. The radar satellite TerraSAR-X, and at a later stage together with TanDEM-X with it's complementary near-real time data acquisition capabilities, offer a whole new approach to the use of space-borne datasets for mapping purposes in time-critical situations. Copyright INCT Numéro de notice : A2009-475 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30104
in Bulletin des sciences géographiques > n° 23 (juin 2009) . - pp 57 - 63[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 253-09011 RAB Revue Centre de documentation En réserve L003 Disponible Architecture for a future C-band/L-band GNSS mission: Part 1 C-band services, space- and ground segment, overall performance / A. Schmitz-Peiffer in Inside GNSS, vol 4 n° 3 (May - June 2009)
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Titre : Architecture for a future C-band/L-band GNSS mission: Part 1 C-band services, space- and ground segment, overall performance Type de document : Article/Communication Auteurs : A. Schmitz-Peiffer, Auteur ; L. Stopfkuchen, Auteur ; J.J. Floch, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : 10 p. ; pp 47 - 56 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Missions spatiales
[Termes IGN] bande C
[Termes IGN] bande L
[Termes IGN] charge utile
[Termes IGN] étude de faisabilité
[Termes IGN] mission spatiale
[Termes IGN] positionnement par GNSSRésumé : (Auteur) Almost all GNSS navigation signals operate in the crowded L-band portion of the radio frequency spectrum. In the past, C-band spectrum has been considered — and rejected — for GNSS services due to a couple of substantial obstacles, despite some distinct technical advantages. However, continued proliferation of signals in L-band and advances in electronics and spacecraft technologies have prompted a new look at C-band for future GNSS services. This article is the first of a two-part series describing the results of a new European Space Agency–sponsored study on the subject. Copyright Gibbons Media & Research LLC Numéro de notice : A2009-660 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33562
in Inside GNSS > vol 4 n° 3 (May - June 2009) . - 10 p. ; pp 47 - 56[article]Voir aussiRéservation
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Code-barres Cote Support Localisation Section Disponibilité 159-09031 SL Revue Centre de documentation Revues en salle Disponible Documents numériques
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Architecture for a future C-band/L-band ... - pdfAdobe Acrobat PDF Exploring the water cycle of the 'blue planet': the Soil Moisture and Ocean Salinity (SMOS) mission / M. Drinkwater in ESA bulletin, n° 137 (February 2009)
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Titre : Exploring the water cycle of the 'blue planet': the Soil Moisture and Ocean Salinity (SMOS) mission Type de document : Article/Communication Auteurs : M. Drinkwater, Auteur ; Yann H. Kerr, Auteur ; Marcel Berger, Auteur ; et al., Auteur Année de publication : 2009 Article en page(s) : pp 6 - 15 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Missions spatiales
[Termes IGN] humidité du sol
[Termes IGN] modèle météorologique
[Termes IGN] salinité
[Termes IGN] SMOS
[Termes IGN] Soil Moisture and Ocean Salinity MissionRésumé : (Auteur) Known as ESA's 'Water Mission', SMOS will improve our understanding of Earth's water cycle, providing much-needed data for modelling of the weather and climate, and increasing the skill in numerical weather and climate prediction. Copyright European Space Agency Numéro de notice : A2009-056 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.esa.int/esapub/bulletin/bulletin137/bul137b_drinkwater.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29686
in ESA bulletin > n° 137 (February 2009) . - pp 6 - 15[article]PermalinkApport des mesures directionnelles et polarisées aux corrections atmosphériques au-dessus des océans ouverts. Application à la mission PARASOL / Tristan Harmel (2009)PermalinkObjectifs terre / J.M. Besnier (2009)PermalinkOptima multi-step collocation: application to the space-wise approach for GOCE data analysis / M. Reguzzoni in Journal of geodesy, vol 83 n° 1 (January 2009)PermalinkA study reference frame consistency in recent Earth gravitational models / Christopher Kotsakis in Journal of geodesy, vol 83 n° 1 (January 2009)PermalinkTerrasar-X1M spaceborne radar / M. Weber in GIM international, vol 23 n° 1 (January 2009)PermalinkVariations in the accuracy of gravity recovery due to ground track variability: GRACE, CHAMP, and GOCE / J. Klokocnik in Journal of geodesy, vol 82 n° 12 (December 2008)Permalinkvol 46 n° 11 Tome 1 - November 2008 - Special section on meteorology, climate, ionosphere, geodesy and reflections from the ocean surfaces: studies by radio occultation methods (Bulletin de IEEE Transactions on geoscience and remote sensing) / Geoscience and remote sensing societyPermalinkMultisensor satellite monitoring of seawater state and oil pollution in the northeastern coastal zone of the Black Sea / S. Shcherbak in International Journal of Remote Sensing IJRS, vol 29 n° 21 (October 2008)Permalinkvol 29 n° 21 - October 2008 - Satellite observations of the atmosphere, oceans and their interface in relation to climate, natural hazards and management of coastal zone (Bulletin de International Journal of Remote Sensing IJRS) / G. LevyPermalink