Descripteur
Termes IGN > sciences naturelles > sciences de la Terre et de l'univers > astronomie > astronomie fondamentale > mécanique céleste > mécanique orbitale
mécanique orbitaleVoir aussi |
Documents disponibles dans cette catégorie (448)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Titre : The role of orbit errors in processing of satellite altimeter data Type de document : Rapport Auteurs : E.J.O. Schrama, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 1989 Collection : Netherlands Geodetic Commission Publications on Geodesy Sous-collection : New series num. 33 Importance : 170 p. Format : 20 x 28 cm ISBN/ISSN/EAN : 978-90-6132-239-9 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Technologies spatiales
[Termes IGN] altimétrie satellitaire par radar
[Termes IGN] données altimétriques
[Termes IGN] invariance
[Termes IGN] mécanique orbitale
[Termes IGN] orbitographie
[Termes IGN] pesanteur terrestre
[Termes IGN] Seasat
[Termes IGN] vitesse radialeRésumé : (auteur) The problem of radial orbit errors in processing of satellite altimeter data is largely due to the inaccuracy of the gravity model which is required for the computation of the trajectory of the spacecraft. A commonly used technique for removing these errors consists of minimizing the crossover differences of profiles measured by the altimeter radar.
Several versions of the technique of least squares crossover minimization have been investigated using either SEASAT observations or simulated data. In these adjustments coefficients of error functions are estimated which are either locally defined over short arc segments, globally over long arc segments, or continuously over an entire arc having a length of several days. The solution of the corresponding normal equations consists of a homogeneous and a particular part.
For each crossover minimization problem (CMP) the homogeneous solution is always given as an analytical expression describing the invariances of the altimetric sea surface with respect to the crossover differences. These invariances are described by a surface deformation function which is characteristic for the problem in question. The number of coefficients in this function equals to the rank defect of the normal matrix in the CMP.
For the particular solution of a local CMP (using "tilt and bias" functions) it was found that 2 non-intersecting and non-overlapping master arc segments have to be fixed. However for global chronological segmented CMP's (using 3 parameter sine-cosine functions) only 1 master arc segment needs to be fixed for a particular solution. For continuous CMP's a particular solution is found by including 9 constraint equations in the form of pseudo observation equations. In this case the error function consists of a Fourier series truncated at a cutoff frequency of 2.3 cycles per revolution including a 2 parameter function modeling a long periodic effect in the orbit.
The underlying problem of gravitational radial orbit errors is described by means of the linear perturbations theory, which is based on the Lagrange planetary equations. Additionally the problem is formulated by means of the Hill equations describing perturbed satellite motions in an idealized circular orbit. It is shown that the non-resonant particular radial solution of the Hill equations coincides with the first-order radial solution derived from the linear perturbations theory assuming a
near circular orbit.
The first-order radial solution has been compared with a simulated signal derived by numerical integration of the equations of motion. The simulated signal consists of the radial differences between two trajectories (resembling the SEASAT 3 day repeat configuration) integrated with different gravity models. It was found that the analytical orbit error model resembles closely the simulated signal after removal of a long periodic effect.
The validity of the general solutions of two global CMP's has been investigated by means of a simulation experiment. In this experiment crossover differences are simulated by means of the radial orbit error signal described above. In a second step it is attempted to reconstruct this signal by minimizing the simulated differences.
This experiment revealed that the general solution of the segmented CMP appears to be hampered by unrealistic velocity discontinuity effects of successive arc segment error functions. In addition, it fails to describe the C11 and S11 and higher degree and order components of a geographically correlated radial orbit error. This is not surprising since one can prove that the homogeneous solution of the segmented CMP (without velocity discontinuities) corresponds to the C00 and C10 component of the geographically correlated radial orbit error. For this reason the global segmented CMP is reformulated in a continuous approach where it is shown that the homogeneous solution coincides with the geographically correlated radial orbit error. Computations showed that the simulated signal deviates to approximately 15 cm r.m.s. with respect to the general solution of the continuous CMP.
Employing the latter technique 5 independent particular solutions of a radial orbit error signal have been computed from SEASAT crossover data. These solutions appear to be highly correlated and suggest the presence of a disturbing effect likely to be caused by gravity modeling errors. Additionally it was found that the individual solutions resemble a concentration of signal near the once per revolution frequency in the radial orbit error spectrum. This solution could in principle be used to improve a part of the gravity model that is used in the trajectory computation of the satellite.
In the last part an integrated approach is described where the problem of modeling errors in the orbit, the geoid and the permanent part of the sea surface topography (PST) caused by ocean circulation are considered simultaneously. It is argued that an application of the integrated approach is justified if simultaneously gravity model improvement is performed employing tracking data of other satellites at different inclinations and eccentricities. Other aspects of the integrated approach concern the modeling problems of the PST field, an omission effect of the gravity field and the relation with the global continuous CMP.Numéro de notice : 57963 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Rapport de recherche DOI : sans En ligne : https://www.ncgeo.nl/downloads/33Schrama.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=60322 Réservation
Réserver ce documentExemplaires(2)
Code-barres Cote Support Localisation Section Disponibilité 57963-01 21.10 Livre Centre de documentation Technologies spatiales Disponible 57963-02 21.10 Livre Centre de documentation Technologies spatiales Disponible The contribution of satellite information to operational weather forcasting : achievements and objectives in the 1990's / J. Reiff in International Journal of Remote Sensing IJRS, vol 9 n°10-11 (October-November 1988)
[article]
Titre : The contribution of satellite information to operational weather forcasting : achievements and objectives in the 1990's Type de document : Article/Communication Auteurs : J. Reiff, Auteur Année de publication : 1988 Article en page(s) : pp 1675 - 1680 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection
[Termes IGN] ERS
[Termes IGN] météorologie
[Termes IGN] orbite défilante
[Termes IGN] Pays-Bas
[Termes IGN] satellite géostationnaire
[Termes IGN] satellite météorologiqueNuméro de notice : A1988-339 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431168808954968 En ligne : https://doi.org/10.1080/01431168808954968 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24918
in International Journal of Remote Sensing IJRS > vol 9 n°10-11 (October-November 1988) . - pp 1675 - 1680[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-88101 RAB Revue Centre de documentation En réserve L003 Disponible Crossed orbit interferometry : theory and experimental results from SIR-B / A.K. Gabriel in International Journal of Remote Sensing IJRS, vol 9 n° 5 (May 1988)
[article]
Titre : Crossed orbit interferometry : theory and experimental results from SIR-B Type de document : Article/Communication Auteurs : A.K. Gabriel, Auteur ; R.M. Goldstein, Auteur Année de publication : 1988 Article en page(s) : pp 857 - 872 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] altitude
[Termes IGN] corrélation
[Termes IGN] image radar
[Termes IGN] image SIR-B
[Termes IGN] interféromètrie par radar à antenne synthétique
[Termes IGN] orbiteNuméro de notice : A1988-173 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01431169008955033 En ligne : https://doi.org/10.1080/01431169008955033 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=24752
in International Journal of Remote Sensing IJRS > vol 9 n° 5 (May 1988) . - pp 857 - 872[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 080-88051 RAB Revue Centre de documentation En réserve L003 Disponible Ephémérides des petites planètes pour l'année 1990 / P. Rocher (1988)
Titre : Ephémérides des petites planètes pour l'année 1990 Type de document : Monographie Auteurs : P. Rocher, Auteur Editeur : Paris : Service des Calculs et de Mécanique Céleste du Bureau des Longitudes Année de publication : 1988 Collection : Notes Scientifiques et Techniques du Bureau des Longitudes num. S-22 Importance : 145 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Vedettes matières IGN] Astronomie fondamentale
[Termes IGN] éphémérides astronomiques
[Termes IGN] planèteIndex. décimale : 31.10 Astronomie fondamentale Numéro de notice : 62639 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61095 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 62639-01 31.10 Livre Centre de documentation En réserve M-103 Disponible Fundamentals of celestial mechanics / J.M.A. Danby (1988)
Titre : Fundamentals of celestial mechanics Type de document : Monographie Auteurs : J.M.A. Danby, Auteur Mention d'édition : 2EME EDITION Editeur : Richemont (Virginie) : Willmann-Bell Année de publication : 1988 Importance : 483 p. Format : 16 x 24 cm ISBN/ISSN/EAN : 978-0-943396-20-0 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Astronomie fondamentale
[Termes IGN] mécanique céleste
[Termes IGN] méthode des moindres carrés
[Termes IGN] orbite képlerienneIndex. décimale : 31.10 Astronomie fondamentale Résumé : (Editeur) This is an introductory text that should be accessible to reader having a background in calculus and elementary differential equations The original edition 1962 has been radically revised, and emphasis is placed on computation. The numerical analysis needed for the computations is derived, and sample programs (run on a PC) are included. There are introductory chapters on the astronomical background and on vectorial mechanics. Sections dealling with the problem of two bodies include the use of universal variables, several methods (including that of Laguerre) for solving Kepler's equation, and problems. The chapter on the determination of orbits includes two versions of Gauss'method, the application of least squares and an introduction to recursive methods. The chapter on numerical methods includes three methods for the numerical integration of differential equations, one of which has full stepsize control. There are also chapters on perturbations, the three and nbody problems, the motion of the Moon and the rotations of the Earth and Moon. The appendix includes numerical tables and derivations of properties of conic sections that are used in the text. The text includes several hundred problems, and suggested computer projectsa diskette that can be used in conjunction with this text is separately available as detailed on the last page of this book. Numéro de notice : 69187 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62127 Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 69187-01 31.10 Livre Centre de documentation Astronomie Disponible Géométrie des images / Alain Baudoin (1988)PermalinkGPS - network analysis / Wojciech Pachelski (1988)PermalinkOcean tides and tectonic plate motions from LAGEOS / John M. Dow (1988)PermalinkOperational interpretation of AVHRR vegetation indices for world crop information / W.R. Philipson in Photogrammetric Engineering & Remote Sensing, PERS, vol 54 n° 1 (january 1988)PermalinkBilan du fonctionnement de SPOT 1 / G. Cales (23/11/1987)PermalinkRigorous stereophotogrammetric treatment of SPOT images / V. Kratky (23/11/1987)PermalinkA comment on Doppler FM rate / R.K. Raney in International Journal of Remote Sensing IJRS, vol 8 n° 7 (July 1987)PermalinkSize distributions of clouds in real time from satellite imagery / D.M. O'Brien in International Journal of Remote Sensing IJRS, vol 8 n° 6 (June 1987)PermalinkAn operational method using Argos orbital elements for navigation of AVHRR imagery / P. Brunel in International Journal of Remote Sensing IJRS, vol 8 n° 4 (April 1987)PermalinkA polar platform for the remote sensing needs of ecology and agriculture : a view from the U.K. / P.J. Curran in International Journal of Remote Sensing IJRS, vol 8 n° 4 (April 1987)PermalinkIn-orbit scientific calibration of Hipparcos / W.G. Tuohey in ESA journal, vol 11 n° 1 (01/01/1987)PermalinkLageos orbit decay due to infrared radiation from Earth / D.P. Rubincam (1987)PermalinkPrecise orbit computation, gravity model adjustment and altimeter data processing for the ERS-1 altimetry mission / K.F. Wakker (1987)PermalinkTrajectoires spatiales / Olivier Zarrouati (1987)PermalinkA contribution to 3D-operational geodesy, Part 4. The observation equations of satellite geodesy in the model of integrated geodesy / Bernd Eissfeller (1986)PermalinkEin Beitrag zur Ephemeridenrechnung und Parameterschätzung im Erde-Mond-System / H. Gleixner (1986)PermalinkGuide to GPS positioning / D. Wells (1986)PermalinkGuide des utilisateurs de données SPOT, 1. 1, Manuel de référence / Centre national d'études spatiales (1986)PermalinkGuide des utilisateurs de données SPOT, 2. 2, Guide pratique / Centre national d'études spatiales (1986)PermalinkGuide des utilisateurs de données SPOT, 3. 3, Guide pratique et annexes / Centre national d'études spatiales (1986)Permalink