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Accueil > Séminaires et conférences > Séminaires, soutenances de thèses et HDR précédents > 2013 > Soutenances de thèses et HDR 2013 > Thèse de Kaveh Mohamadabadi le 29 novembre à 14h

Thèse de Kaveh Mohamadabadi le 29 novembre à 14h

Contribution à la conception d’un magnétomètre à magnéto-impédance géante

Lieu  : Palaiseau, amphi Gay-Lussac

Résumé  : Before the Second World War, several INS (inertial navigation systems) were built, but at that time, the performances of the inertial sensors were not sufficient to implement them in a system. During the second war, the German scientists developed an inertial guidance system for the rockets. Very soon after, the competition started in order to improve the sensor performances and develop a new type of system. Recently, MEMS (Micro electro mechanical system) technology has been developed very fast and merged to many other technologies and applications. This revolution has resulted to fabricate a high volumes of low-cost sensor such as accelerometers, gyro and magnetometers with acceptable performances, power consumption, size, weight, etc. the results of this changes are well-known for everybody only by using the smartphones. As a result, nowadays, using strapdown technology becomes dominant compared to the stable platform for inertial navigation systems. Generally, the INS contains inertial sensor such as accelerometers and gyroscopes. However, with the low-cost sensors, the drift and error of them are too high and additional sensors have to be added to reduce the system error. The magnetometers, barometers, temperature sensor can be mentioned as such examples. The main aim of using the magnetic sensor in INS is as a magnetic compass for heading. This work addresses the relevant errors of the anisotropic magnetoresistance sensor for inertial navigation systems. Meanwhile, it provides resulting guidelines and solution for using the AMR sensors in a robust and proper way relative to the applications. The new methods also are proposed to improve the performances, reduce the power requirement and cost design of the magnetometer. The new compensation method is proposed by developing an optimization algorithm. The necessity of the sensor calibration is shown and the source of the errors and compensating model are investigated. Two novel methods of indoor calibration are proposed and examples of operating systems are presented.

Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Pascal Chabert (Directeur)