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A new technique to determine geoid and orthometric heights from satellite positioning and geopotential numbers / Lard Erik Sjöberg in Journal of geodesy, vol 80 n° 6 (September 2006)  

Public [article]  inJournal of geodesy > vol 80 n° 6 (September 2006) . - pp 304 - 312 Titre : A new technique to determine geoid and orthometric heights from satellite positioning and geopotential numbers Type de document : Article/Communication Auteurs : Lard Erik Sjöberg, Auteur Année de publication : 2006 Article en page(s) : pp 304 - 312 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] altitude normale [Termes IGN] altitude orthométrique [Termes IGN] cote géopotentielle [Termes IGN] géoïde gravimétrique [Termes IGN] géoïde local [Termes IGN] levé gravimétrique [Termes IGN] nivellement par GPS Résumé : (Auteur) This paper takes advantage of space-technique-derived positions on the Earth’s surface and the known normal gravity field to determine the height anomaly from geopotential numbers. A new method is also presented to downward-continue the height anomaly to the geoid height. The orthometric height is determined as the difference between the geodetic (ellipsoidal) height derived by space-geodetic techniques and the geoid height. It is shown that, due to the very high correlation between the geodetic height and the computed geoid height, the error of the orthometric height determined by this method is usually much smaller than that provided by standard GPS/levelling. Also included is a practical formula to correct the Helmert orthometric height by adding two correction terms: a topographic roughness term and a correction term for lateral topographic mass–density variations. Copyright Springer Numéro de notice : A2006-416 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0057-5 En ligne : https://doi.org/10.1007/s00190-006-0057-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28140 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-06081	RAB	Revue	Centre de documentation	En réserve L003	Disponible
266-06082	RAB	Revue	Centre de documentation	En réserve L003	Disponible

Precise orbit determination for the GRACE mission using only GPS data / Z. Kang in Journal of geodesy, vol 80 n° 6 (September 2006)  

Public [article]  inJournal of geodesy > vol 80 n° 6 (September 2006) . - pp 322 - 331 Titre : Precise orbit determination for the GRACE mission using only GPS data Type de document : Article/Communication Auteurs : Z. Kang, Auteur ; B. Tapley, Auteur ; S. Bettadpur, Auteur ; et al., Auteur Année de publication : 2006 Article en page(s) : pp 322 - 331 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] GRACE [Termes IGN] orbitographie par GNSS [Termes IGN] positionnement par GPS [Termes IGN] télémétrie laser sur satellite Résumé : (Auteur) The GRACE (gravity recovery and climate experiment) satellites, launched in March 2002, are each equipped with a BlackJack GPS onboard receiver for precise orbit determination and gravity field recovery. Since launch, there have been significant improvements in the background force models used for satellite orbit determination, most notably the model for the geopotential. This has resulted in significant improvements to orbit accuracy for very low altitude satellites. The purpose of this paper is to investigate how well the orbits of the GRACE satellites (about 470 km in altitude) can currently be determined using only GPS data and based on the current models and methods. The orbit accuracy is assessed using a number of tests, which include analysis of orbit fits, orbit overlaps, orbit connecting points, satellite Laser ranging residuals and K-band ranging (KBR) residuals. We show that 1-cm radial orbit accuracy for the GRACE satellites has probably been achieved. These precise GRACE orbits can be used for such purposes as improving gravity recovery from the GRACE KBR data and for atmospheric profiling, and they demonstrate the quality of the background force models being used. Copyright Springer Numéro de notice : A2006-417 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0073-5 En ligne : https://doi.org/10.1007/s00190-006-0073-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28141 [article]

Exemplaires(2)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
266-06081	RAB	Revue	Centre de documentation	En réserve L003	Disponible
266-06082	RAB	Revue	Centre de documentation	En réserve L003	Disponible