M. Elliot Broussard soutient sa thèse le 30/11/2018 à 10h00.
Lieu : amphithéâtre Gaston Berger de l’INSA de Lyon, Villeurbanne.
Titre :
New control algorithm for Satcom On The Move
Jury :
Christine Prelle, Professeur, Roberval Lab, UTC (Rapporteur)
Sébastien Cauet, Maître de conférences HdR, LIAS, Université de Poitiers (Rapporteur)
Nicolas Marchand, Directeur de Recherche CNRS, GIPSA-lab, Grenoble (Examinateur)
Stéphane Caro, Directeur de Recherche CNRS, LS2N, Nantes (Examinateur)
Minh Tu Pham, Maître de conférences HdR, Ampère, INSA Lyon (Directeur de thèse)
Xavier Brun, Professeur, Ampère, INSA Lyon (Directeur de thèse)
Le texte intégral de cette thèse sera accessible sur intranet à partir du 30-11-2028
Abstract :
In military and civil application, satellite communications (SACTOM) are often needed on moving vehicles (drones, planes, land vehicles, vessels…) in order to transfer all kind of data (pictures, videos, internet …). These types of stations are called SATCOM On The Move (SOTM). In order insure high data rates, the antenna must be directional, which means that they direct electro-magnetic waves in a particular direction of space, called line of sight. The line of sight must be steered in order to be aligned with the satellite to insure a strong communication link with the highest data rate possible. Stabilized platforms, called Antenna Positioning System, aim to steer the antenna’s line of sight in the satellite direction. The pointing requirements are the source of conception constraints that reduce the cost efficiency of the overall station.
This PhD report focus on the development and the study of a new pointing strategy called Helios (“Hybrid Estimator of LIne Of Sight”). This algorithm uses least squares to found the antenna pattern in real time, using an observation window. Among others, it allows to reduce the bandwidth of the control loops by generating a trajectory easier to follow. Therefore, it decreases the conception constraints (friction, backlash, field bus data rate …).
Helios is tested through experimentation, using Thales industrial prototypes. The vehicle is emulated by a hexapod. Simulation is carried out in order to fit the measured experimental behavior. To do so, parametrical and non-parametrical identification has been done on the SOTM prototype. This way, Helios is validated and studied in operational conditions.
Keywords :
Satcom On The Move, Inertially stabilized platform, Line of sight, Real time estimation, Least squares