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Étude et développement d'un système de gravimétrie mobile

Abstract : Actual measurement techniques of the gravity field, from space to surface observations, cover a wide range of spatial resolutions of the Earth gravity field. Those data are not only used to determine high resolution geoid models, but also help to understand mass transfers inside the Earth.
Nevertheless, spatial and spectral extends of gravity measurements are not homogeneous on Earth's surface and for some isolated areas, measurements are missing. Furthermore, the intermediary spatial resolutions (10/100 km) are still badly covered by the terrestrial and space gravimetry. The mobile gravimetry from a terrestrial vehicle, a boat or a plane, appears to be the complementary technique to compensate for the lack of current gravimetry techniques.
The primary objective of this work is the development of an autonomous mobile gravimetry system. The « Limo-G » (LIght MOving Gravimetry) system is an absolute vector gravimeter, consisted of three accelerometers and a GPS system with four antennas. It can be loaded on every kind of vehicles, is reliable, ergonomic and quite cheap.
Metrologic surveys have been done in laboratory and on field to design and to test a calibration method of the instrument. Then, an original treatment method combining accelerometers and GPS data has been developed and tested from synthetic data based on real data acquired from an experimental survey at sea. The results of those simulations indicate that the Limo-G system reaches the milligal accuracy. The appropriate changes needed of the system to improve the accuracy of the gravity estimations have been underlined and validated using synthetic data.
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Submitted on : Thursday, October 2, 2008 - 2:04:41 PM
Last modification on : Tuesday, May 4, 2021 - 2:54:22 PM
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  • HAL Id : tel-00326276, version 1

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Bertrand de Saint-Jean. Étude et développement d'un système de gravimétrie mobile. Géophysique [physics.geo-ph]. Observatoire de Paris, 2008. Français. ⟨tel-00326276⟩

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