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Mesure de déformation par combinaison de techniques géodésiques : Auscultation par GPS et topométrie

Abstract : The Earth is a constantly evolving planet and its surface keeps transforming. Its deformations raise questions. For several years, the L2G at ESGT has been interested in the study of deformations through inter comparison of techniques. For this, it has various measurement processes. Then, with time, the laboratory is now pondering about the interest of combining various techniques of measurement in order to observe fine and precise deformations (a few millimeters).The aim of this PhD thesis is to demonstrate the interest of combining GNSS and topometric measurements, the latter being apparently the most commonly used. The presented results are based on simulations and campaigns of combined measurement through the use of GNSS and topometric techniques made on a model network of a local area. Thecalculations made are dependent both on the distance of the baseline and the alteration of the session length.We show that a combination through the accumulation of the normal equations improves the localisation accuracy regarding not only the use of every separate technique but also the more classic methods based on the coordinates combination provided by GNSS and topometric techniques.
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Benoît Legru. Mesure de déformation par combinaison de techniques géodésiques : Auscultation par GPS et topométrie. Autre. Conservatoire national des arts et metiers - CNAM, 2011. Français. ⟨NNT : 2011CNAM0766⟩. ⟨tel-00736511⟩

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