Aujourd'hui les reseaux de capteurs sont devenus des systemes pouvant atteindre un tres grand nombre de noeuds, avec une zone de couverture determinee et deployes d'une maniere plus ou moins dense dans un environnement heterogene dont on mesure ainsi son etat global. La problematique de cette these consiste a concevoir une architecture pour les objets communicants a faible consommation en utilisant des antennes « intelligentes » pour l'instrumentation et la mesure. Integrant une approche pluridisciplinaire, cette architecture couvre les services offerts depuis les couches MAC jusqu'a celles de plus haut niveau. Bases sur une partie materielle completement reconfigurable (amplificateur de puissance et antennes a base de MEMS RF), les services des couches superieures sont definis en partie sur circuits numeriques pour la couche physique (bande de base) et la couche MAC, et de maniere logicielle pour les protocoles de routages adaptes et les services innovants. En resume, le travail consiste a concevoir un systeme autonome multi capteurs, d'acquisition et de traitement avec memorisation, communicant a travers un reseau sans fil. Les principaux problemes a resoudre seront : le controle de la topologie, la precision de la synchronisation, la consommation d'energie.

Structural health monitoring is today growing challenge. A good health structure allows to assure in real-time a good performance level, to keep a high level of safety and to plan maintenance. Why drone applications? Drones are very expansive aircrafts, also referred to as UVA (unmanned air vehicle), exposed to a harsh environment due to their frequent military usage. In this context, propellers are among the key components worth health monitoring. The purpose of our research is to develop for the drone propeller an integrated electronics combining accelerometers and signal processing, able to record damaging events for the drone: shocks, vibrations or overspeeds whereas strain gauges could not analyze all these criteria. These parameters allow concluding whether the blade is damaged or not. This paper will present our embedded microsystem on drone propellers. Then we will show through real experiments how it is possible to monitor and detect events like stone shocks, propeller overspeeds or too strong vibrations. Specific algorithm for diagnosis will be discussed and evaluated in different environment tests conditions. Moreover the use of a wireless synchronization between several propellers will be studied too.

The behavior of Wireless Sensor Networks (WSN) is nowadays widely analyzed. One of the most important issues is related to their energy consumption, as this has a major impact on the network lifetime. Another important application requirement is to ensure data sensing synchronization, which leads to additional energy consumption as a high number of messages is sent and received at each node. Our proposal consists in implementing a combined synchronization protocol based on the IEEE 1588 standard that was designed for wired networks and the PBS (Pairwise Broadcast Synchronization) protocol that was designed for sensor networks, as none of them is able to provide the needed synchronization accuracy for our application on its own. The main goals of our new synchronization protocol are: to ensure the accuracy of local clocks up to a tenth of a microsecond and to provide an important energy saving. Our results obtained using NS-2 (Network Simulator) show that the performance of our solution (IEEE 1588-PBS) matches our application requirements with regard to the synchronization, with a significant improvement in energy saving.

This paper deals with the embedded network dedicated to the entertainment system of passenger cabin in an aircraft. The work described in this paper focuses on a wireless solution to interconnect the main components of this system. The selected solution is UWB with smart antennas. This solution is proved to be able to provide the system with the needed bandwidth. The self-configuration capability of the system is also demonstrated.

This paper deals with the embedded network dedicated to the entertainment system of passenger cabin in an aircraft. The work described in this paper focuses on a wireless solution to interconnect the main components of this system. The selected solution is UWB with smart antennas. This solution is proved to be able to provide the system with the needed bandwidth. The self-configuration capability of the system is also demonstrated.