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Satellite orbit integration based on canonical transformations with special regard to the resonance and coupling effects / C. Cui (1997)
Titre : Satellite orbit integration based on canonical transformations with special regard to the resonance and coupling effects Type de document : Monographie Auteurs : C. Cui, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1997 Collection : DGK - A Sous-collection : Theoretische Geodäsie num. 112 Importance : 128 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-8193-2 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Techniques orbitales
[Termes IGN] modèle de géopotentiel
[Termes IGN] orbitographie
[Termes IGN] résonance
[Termes IGN] transformation canoniqueRésumé : (Auteur) Presented are the concept and the methods to get a complete analytical solution of the system of equations describing the motion of satellites under the action of a set of body and dissipative forces with consideration of coupling and resonance effects. A solution for the perturbations due to the Earth's direct geogravitation, due to the luni-solar gravitation, due to earth tide effects as well as due to the air drag and the normal solar radiation pressure is given including the interaction of orbital perturbations due to the different perturbation effects as well as resonance effects up to the second order. The equations of motion are formulated as a canonical system of equations including dissipation force terms by using the Hill-variables. An integrable Hamiltonian of such a system has been given in a quite general form as a guidance to select suitable canonical transformations and to solve the transformed system of equations. Resonance terms of the Hamiltonian are classified into two categories: normal (medium) resonance terms and strong ones. A successive infinitesimal Lie-transformation scheme has been developed in a general form to remove all periodic terms leading either to non-resonance effects or to medium resonance effects from the Hamiltonian.
This scheme has been applied to the system of equations of motion of the satellites involving also the action of non-gravitational forces. By this transformation the non-gravitational force terms are transformed too. In such a way a transformed system of equations (transformed Hamiltonian and transformed non-gravitational force terms) has been obtained. This transformed system of equations consists of a solvable major part and a minor part including both the strong resonance terms of the Hamiltonian together with the dissipation terms. The transformed system of equations has been solved by a linearisation approach usually called the Encke method. This method provides a regular solution for all orbital configurations with non-zero inclinations, among them in particular also orbits with the critical inclination, terrestrial repeating (cyclic) orbits and the polar orbits. All these kinds of orbit are of major importance for Earth observation satellites, but until now, they have only been treated insufficiently by the various existing forms of analytical solutions.Numéro de notice : 28248 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63594 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28248-01 21.10 Livre Centre de documentation Technologies spatiales Disponible 28248-02 21.10 Livre Centre de documentation Technologies spatiales Disponible Short term thermal and hydrological signatures related to tectonic activities / Michel Van Ruymbeke (1997)
Titre : Short term thermal and hydrological signatures related to tectonic activities : proceedings of the workshop, Walferdange, Luxembourg, 15 - 17 November, 1995 Type de document : Actes de congrès Auteurs : Michel Van Ruymbeke, Éditeur scientifique Editeur : Luxembourg : Conseil de l'Europe Année de publication : 1997 Collection : Cahiers du Centre Européen de Géodynamique et de Séismologie num. 14 Conférence : ECGS 1995, workshop Short term thermal and hydrological signatures related to tectonic activities 15/11/1995 17/11/1995 Walferdange Grand Duché du Luxembourg Importance : 197 p. Format : 16 x 23 cm ISBN/ISSN/EAN : 978-2-87977-002-4 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géophysique interne
[Termes IGN] hydrogéologie
[Termes IGN] pesanteur terrestre
[Termes IGN] sismologie
[Termes IGN] tectoniqueRésumé : (Auteur) The main purpose had been to promote exchange of information on recent progress obtained in understanding the nature and characteristics of short-term thermal and hydrological signals related to tectonic activities and discuss problems involved in the detection and measurement of such signals. Numéro de notice : 67473 Affiliation des auteurs : non IGN Nature : Actes Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61777 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 67473-01 CG.95 Livre Centre de documentation Congrès Disponible Zur präzisen Berechnung der Oberflächenkräfte eines erdgebundenen Satelliten auf Basis der Hill-Variablen. Ein quasi-universelles Bahnintegrationsprogramm / K. Arfa-Kaboodvand (1997)
Titre : Zur präzisen Berechnung der Oberflächenkräfte eines erdgebundenen Satelliten auf Basis der Hill-Variablen. Ein quasi-universelles Bahnintegrationsprogramm Titre original : [Vers une estimation précise de la force des superficies d'un satellite terrestre sur la base des variables de Hill : un programme d'intégration d'orbite quasi-universel] Type de document : Thèse/HDR Auteurs : K. Arfa-Kaboodvand, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1997 Collection : DGK - C Sous-collection : Dissertationen num. 476 Importance : 75 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9516-8 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Techniques orbitales
[Termes IGN] anomalie de pesanteur
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] équation de Hill
[Termes IGN] International Terrestrial Reference System
[Termes IGN] mécanique orbitale
[Termes IGN] orbitographie
[Termes IGN] perturbation orbitale
[Termes IGN] système de référence géodésiqueNuméro de notice : 28014 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=63361 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 28014-01 21.10 Livre Centre de documentation Technologies spatiales Disponible 28014-02 21.10 Livre Centre de documentation Technologies spatiales Disponible Le système Doris : applications actuelles à l'IGN et perspectives d'avenir / Pascal Willis in Bulletin d'information de l'Institut géographique national, n° 65 (avril 1996)
[article]
Titre : Le système Doris : applications actuelles à l'IGN et perspectives d'avenir Type de document : Article/Communication Auteurs : Pascal Willis , Auteur Année de publication : 1996 Article en page(s) : pp 65 - 72 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] DORIS
[Termes IGN] étalonnage d'instrument
[Termes IGN] positionnement par DORIS
[Termes IGN] rotation de la Terre
[Termes IGN] trajectographie par DORISNuméro de notice : 65966 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34428
in Bulletin d'information de l'Institut géographique national > n° 65 (avril 1996) . - pp 65 - 72[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 015-96011 RAB Revue Centre de documentation En réserve L003 Disponible CCD-Astrometrie von Objekten des geostationären Ringes / M. Ploner (1996)
Titre : CCD-Astrometrie von Objekten des geostationären Ringes Titre original : [Astrométrie CCD des objets de l'anneau géostationnaire] Type de document : Rapport Auteurs : M. Ploner, Auteur Editeur : Vienne [Autriche] : Technische Universität Wien Année de publication : 1996 Collection : Geowissenschaftliche Mitteilungen, ISSN 1811-8380 num. 46 Importance : 133 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] astrométrie
[Termes IGN] campagne d'observations
[Termes IGN] chambre DTC
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] orbitographie
[Termes IGN] Pascal
[Termes IGN] satellite géostationnaire
[Termes IGN] satellite météorologique
[Termes IGN] transformation de coordonnéesIndex. décimale : 30.40 Géodésie physique Résumé : (Auteur) The motions of artificial satellites are influenced by gravitational and non-gravitational perturbations. Of special interest among the gravitational perturbations is the anisotropy of the earth's gravitational field. Orbits of geostationary satellites are extremely sensitive to perturbations caused by the earth's equatorial ellipticity, which is described by the coefficients C22 and S22 in the harmonic series expansion of the geopotential. These coefficients cause resonant perturbations, which lead to a librating motion of geostationary objects around two defined points of the earth's equator. These points are located at longitude east 75' and longitude west 105' of Greenwich. The period of the librating motion varies between 1000 and 2000 days, changes in the semi-major axis can reach up to 35 km. On the other hand, these large variations allow for a very exact calculation of the above mentioned terms by means of observing geostationary satellites over a period of only a few weeks. Meteosat satellites are extremely useful for this type of study, because in contrast to communication satellites, orbit manoeuvres are carried out only every 2 or 3 months.
In the course of this project, the Zeiss BNIK 75 ballistic camera of the Graz-Lustbühel satellite observation centre was adapted for CCD observations. Instead of the automatic plate-changing device, the CCD camera SITe 1024B (1024*1024 pixel, pixel size 24µm, backside illuminated, 1 pixel = 6.6") was mounted. Thanks to a special shuttering technique, the epoch registration of the observations can be carried out with an accuracy of a few microseconds. After installing the hardware, a two-month observation campaign of the satellites Meteosat 5 and Meteosat 6 as well as the Russian satellites Gorizont 11 and Statsionar-raduga 8 was carried out. Whereas, due to orbital manoeuvres, the orbits of the Meteosat satellites are very close to the theoretical geostationary orbit, the latter mentioned satellites have not been controlled for a quite long time. Inevitably this causes an increasing motion leading away from their geostationary orbit. They also are marked by heavy tumbling movements.
The astrometric evaluation of the observations was carried out with the help of the program CCD. Its development was - besides the hardware installation - one of the main tasks of this project. This Windows application, which is written in Borland Pascal 7.0, permits the use of different polynomes for the transformation of the measured coordinates into tangent coordinates and makes use of various fit algorithms (Gaussian, Laplace and Cauchy distributions) for the calculation of the object coordinates. Usually the star tracker is switched off when observations of geostationary satellites are carried out. Therefore special attention has to be paid to the determination of the starting and final point of star trails. The reference stars can be selected from the PPM and the GSC catalogue. The calculated coordinates of the measured objects either refer to the true date and equinox or to the mean date and equinox (J2000.0).
The orbit integration program ORBDET of the Astronomical Institute of the University of Berne was used for the calculation of the osculating orbital elements and the direct solar radiation pressure of all satellites. The residuals of the two Meteosat satellites did not show any remaining signals. The average deviation of a single observation was 0.5" for these extremely faint objects, which corresponds to less than 1/10 of the pixel size. This high accuracy was a consequence of calculating the satellite coordinates by fitting a two-dimensional Gaussian distribution. The situation concerning Gorizont 11 and Statsionar-raduga 8 is different. Significant signals were found in the residuals, which can be explained by extreme difficulties in establishing an appropriate model for the direct solar radiation pressure. While Meteosat satellites have a simple cylindrical shape, the Russian satellites are marked by large solar panels. The establishment of a model for the direct solar radiation pressure is further complicated because of the heavy tumbling movements.
Finally, the geopotential coefficients C22 and S22 were calculated from observations of the satellites Meteosat 5 and 6. The results show an extremely low deviation from the corresponding numbers of the well-known gravity model JGM-3). By combining this data with observations made by the satellite observation centre Zimmerwald (Switzerland), the accuracy of the coefficients C22 and S22 could be further increased. The calculations result in the following values for the two normalized coefficients :
C22 = 2.43923E-06 ± 3.9OE-10
S22 = -1.4003IE-06 ± 9.77E-11
The results show that CCD observations of geostationary satellites can contribute considerably to the determination of the above mentioned parameters. A further increase in accuracy is to be expected by the use of the Hipparcos star catalogue, which is going to be available in summer 1997.Numéro de notice : 55044 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Rapport d'étude technique Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=59754 Réservation
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