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[n° ou bulletin]
est un bulletin de Artificial satellites / Space research centre of polish academy of sciences (2006 -) ![]()
[n° ou bulletin]
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Dépouillements
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Self-shadowing of a spacecraft in the computation of surface forces : An example in planetary geodesy / Georges Balmino in Artificial satellites, vol 53 n° 1 (March 2018)
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[article]
Titre : Self-shadowing of a spacecraft in the computation of surface forces : An example in planetary geodesy Type de document : Article/Communication Auteurs : Georges Balmino, Auteur ; J.C. Marty, Auteur Année de publication : 2018 Article en page(s) : pp 1 - 27 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales
[Termes IGN] décomposition
[Termes IGN] détection d'ombre
[Termes IGN] engin spatial
[Termes IGN] Mars (planète)
[Termes IGN] problème inverse
[Termes IGN] surface (géométrie)Résumé : (auteur) We describe in details the algorithms used in modelling the self-shadowing between spacecraft components, which appears when computing the surface forces as precisely as possible and especially when moving parts are involved. This becomes necessary in planetary geodesy inverse problems using more and more precise orbital information to derive fundamental parameters of geophysical interest. Examples are given with two Mars orbiters, which show significant improvement on drag and solar radiation pressure model multiplying factors, a prerequisite for improving in turn the determination of other global models. Numéro de notice : A2018-173 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.2478/arsa-2018-0002 Date de publication en ligne : 24/03/2018 En ligne : https://doi.org/10.2478/arsa-2018-0002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89813
in Artificial satellites > vol 53 n° 1 (March 2018) . - pp 1 - 27[article]Kinematic-PPP using single/dual frequency observations from (GPS, GLONASS and GPS/GLONASS) constellations for hydrography / Ashraf Farah in Artificial satellites, vol 53 n° 1 (March 2018)
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[article]
Titre : Kinematic-PPP using single/dual frequency observations from (GPS, GLONASS and GPS/GLONASS) constellations for hydrography Type de document : Article/Communication Auteurs : Ashraf Farah, Auteur Année de publication : 2018 Article en page(s) : pp 37 - 46 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Assouan
[Termes IGN] données GLONASS
[Termes IGN] données GPS
[Termes IGN] Nil (fleuve)
[Termes IGN] positionnement cinématique
[Termes IGN] positionnement par GLONASS
[Termes IGN] positionnement par GPS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] récepteur bifréquence
[Termes IGN] récepteur monofréquenceRésumé : (auteur) Global Positioning System (GPS) technology is ideally suited for inshore and offshore positioning because of its high accuracy and the short observation time required for a position fix. Precise point positioning (PPP) is a technique used for position computation with a high accuracy using a single GNSS receiver. It relies on highly accurate satellite position and clock data that can be acquired from different sources such as the International GNSS Service (IGS). PPP precision varies based on positioning technique (static or kinematic), observations type (single or dual frequency) and the duration of observations among other factors. PPP offers comparable accuracy to differential GPS with safe in cost and time. For many years, PPP users depended on GPS (American system) which considered the solely reliable system. GLONASS's contribution in PPP techniques was limited due to fail in maintaining full constellation. Yet, GLONASS limited observations could be integrated into GPS-based PPP to improve availability and precision. As GLONASS reached its full constellation early 2013, there is a wide interest in PPP systems based on GLONASS only and independent of GPS. This paper investigates the performance of kinematic PPP solution for the hydrographic applications in the Nile river (Aswan, Egypt) based on GPS, GLONASS and GPS/GLONASS constellations. The study investigates also the effect of using two different observation types; single-frequency and dual frequency observations from the tested constellations. Numéro de notice : A2018-174 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.2478/arsa-2018-0004 Date de publication en ligne : 24/03/2018 En ligne : https://doi.org/10.2478/arsa-2018-0004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89814
in Artificial satellites > vol 53 n° 1 (March 2018) . - pp 37 - 46[article]