De l'usage d'architectures Ethernet commutées embarquées dans les lanceurs spatiaux

Abstract : Current space launchers, and particularly Ariane 5, use the deterministic network MIL-STD-1553B. According to the new objectives of cost and system mass reduction and of multimedia traffic support, this technology is not optimal anymore. Among the potential candidates, this thesis highlights the fact that such objectives can be achieved through the use of Ethernet standard based on components-on-the-shelf. The first contribution focuses on time performance evaluation of switched architectures. The gain and limits related to the communication mode (from master/slaves to producers/consummers) and future avionic distribution are studied. This study relies on a deterministic evaluation of the end-to-end delay by using network calculus, simulations and experiments. These results are validated with two switched architectures by using a scenario considered as representative of current flights. The second contribution is the network availability improvement. A real-time path reconfiguration strategy is proposed through active network supervision. Based on critical requirements, it is also suggested to use multiple spanning-trees for anticipating network element failures. The last contribution deals with the issue that in switched and segmented architectures it is not possible to collect all the traffic as in a bus. In order to do so, this thesis introduces the configurations under which a clock synchronization protocol could contribute to generate a single network trace from many collecting points. This work will enable to identify the tests for a future Ethernet standard validation in the framework of space launchers
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https://hal.univ-lorraine.fr/tel-01749322
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Submitted on : Thursday, March 29, 2018 - 12:12:49 PM
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Jérémy Robert. De l'usage d'architectures Ethernet commutées embarquées dans les lanceurs spatiaux. Autre. Université de Lorraine, 2012. Français. ⟨NNT : 2012LORR0128⟩. ⟨tel-01749322⟩

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