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Le projet gradio et la determination a haute resolution du geopotentiel

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Résumé

Une des techniques de détermination fine et globale du champ de gravitation terrestre U est la gradiométrie spatiale, dans laquelle on mesure à bord d'un satellite sur orbite basse certaines combinations linéaires des composantes du tenseur ∂2 U/∂xi ∂xj dans des axes {x i } liés au satellite. Un tel projet, appelé GRADIO, est actuellement à l'étude en France et pourrait aboutir à partir de 1990. Après avoir rappelé les objectifs scientifiques d'une telle mission, nous en donnons les spécifications—étayées par une série d'études analytiques; nous définissons ensuite le satellite porteur et ses caractères techniques, en insistant sur les points délicats de la faisabilité (facteurs d'échelle des micro-accéléromètres constituant l'appareil, connaissance de l'attitude...) et en présentant des idées de solution en cours d'approfondissement.

Summary

Satellite gradiometry arises as one of the methods for improving our knowledge of the global Earth gravity field at high resolution: by means of micro-accelerometers on board a low orbiting spacecraft, linear combination of the gravity tensor components ∂2 U/∂xi ∂xj are measured in a satellite-fixed reference frame {x i }. Based on this technique, a project named GRADIO is presently under study in France and could fly in 1990 at the earliest. After the scientific objectives of that experiment have been reviewed, the measurement specifications are given as coming from various analytical studies. The platform and its characteristics are then defined: the critical realization problems (scale factors of the micro-accelerometers, spacecraft attitude control and restitution) are pointed out together with some ideas for their solution which are under analysis and require further study.

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Authors and Affiliations

  1. Bureau Gravimétrique International, Toulouse, France

    G. Balmino & D. Letoquart

  2. Groupe de Recherches de Géodésie Spatiale, CERGA, Grasse, France

    F. Barlier & M. Ducasse

  3. Office National d'Etudes et de Recherches Aérospatiales, Chatillon-sous-Bagneux, France

    A. Bernard & B. Sacleux

  4. Centre National d'Etudes Spatiales, Toulouse, France

    C. Bouzat & J. J. Runavot

  5. Université Paris VI, Paris, France

    X. Le Pichon

  6. Groupe de Recherches de Géodésie Spatiale, Toulouse, France

    M. Souriau

Authors
  1. G. Balmino
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  2. D. Letoquart
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  3. F. Barlier
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  4. M. Ducasse
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  5. A. Bernard
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  6. B. Sacleux
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  7. C. Bouzat
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  8. J. J. Runavot
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  9. X. Le Pichon
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  10. M. Souriau
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Balmino, G., Letoquart, D., Barlier, F. et al. Le projet gradio et la determination a haute resolution du geopotentiel. Bull. Geodesique 58, 151–179 (1984). https://doi.org/10.1007/BF02520899

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  • DOI: https://doi.org/10.1007/BF02520899

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