Développement et validation d'une méthode de calcul GPS intégrant des mesures de profils de vapeur d'eau en visée multi-angulaire pour l'altimétrie de haute précision.

Abstract : IGN is interested in the use of GPS for millimetric leveling activities: GPS is weatherproof, low cost and simple to work. A major error source is linked to the effect of GPS signals propagation through the atmosphere, which limits the vertical accuracy between 3 and 15 mm.
The NIGPS project, conducted in collaboration by IGN and SA (CNRS), aims at a precise correction of tropospheric effect on GPS signals propagation using multi-directional humidity measurements from Raman lidar. This dissertation fits to the work presented in 2005 by Jérôme Tarniewicz and aims at the methodological study, the instrumental development and the experimental validation of combined analysis of GPS and Raman lidar observations.
First we study troposphere impact on GPS and its correction from numerical simulations. Thus precise retrieval and validation of Raman lidar humidity measurements are investigated. Data from VAPIC'04 campaign confirm troposphere impact on GPS solution. Lidar measurements are compared to other techniques, which highlights lidar ability for fast water-vapor fluctuations retrieval. A first evaluation of the correction of GPS observations using zenithal lidar measurements is realized for 6h-sessions and emphasizes lidar contribution on considered cases. In the future, these results could be improved by taking into account slant lidar measurements.
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Submitted on : Wednesday, September 17, 2008 - 3:52:18 PM
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Pierre Bosser. Développement et validation d'une méthode de calcul GPS intégrant des mesures de profils de vapeur d'eau en visée multi-angulaire pour l'altimétrie de haute précision.. Planète et Univers [physics]. Université Pierre et Marie Curie - Paris VI, 2008. Français. ⟨tel-00322404⟩

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