Archives Ouvertes HAL
Toutes les publications de l'ENAC en direct.
All ENAC publications.
[hal-04505620] Rethinking LEO Constellations Routing
This study investigates the Unsplittable Multi-Commodity Flow (UMCF) as a routing algorithm for LEO constellations. Usually, LEO routing schemes enable the Floyd-Warshall algorithm (Shortest Path) to minimize the end-to-end latency of the flows crossing the constellation. We propose to solve the UMCF problem associated with the system as a solution for routing over LEO. We use a heuristic algorithm based on randomized rounding known in the optimization literature to efficiently solve the UMCF problem. Furthermore, we explore the impact of choosing the first/last hop before entering/exiting the constellation. Using network simulation over Telesat constellation, we show that...
[hal-04504788] Division réseau équitable dans les essaims de nanosatellites
Nous proposons de partitionner l’architecture d’un réseau ad-hoc mobile en plusieurs groupes, afin de re-distribuer équitablement la charge entre les membres du réseau. Notre étude porte sur un essaim de nanosatellites fonctionnant comme un télescope spatial distribué, placé en orbite lunaire. Chaque nanosatellite de l’essaim collecte des données d’observation de l’espace, puis les échange avec les autres membres de l’essaim. Les données recueillies sont ensuite combinées localement afin de produire l’image globale observée par l’essaim. Cependant, un système fondé sur ce mode opératoire est particulièrement sensible aux pertes de paquets et aux pannes d’énergie. En effet...
[hal-04500108] Multimodal communication device for light aviation pilots
In the context of light aviation, airborne communication between pilots and Air Traffic Control (ATC) is at present only ensured orally via a radio channel. To provide safer and more accessible communications and based on a FANS4ALL initiative, we are developing a multimodal Human-Machine Interface (HMI) combining the sight and touch. The device consists of a tablet placed close to the cockpit and a vibrating vest worn by the pilot. The goal is to enable pilots to stay informed, perceive new instructions and exchange feedback with ATC without a considerable increase in their mental workload or a degradation of their situational awareness that would degrade flight safety...
[hal-04497643] Challenges of Music Score Writing and the Potentials of Interactive Surfaces
Composers use music notation programs throughout their creative process. Those programs are essentially elaborate structured document editors that enable composers to create high-quality scores by enforcing musical notation rules. They effectively support music engraving, but impede the more creative stages in the composition process because of their lack of flexibility. Composers thus often combine these desktop tools with other mediums such as paper. Interactive surfaces that support pen and touch input have the potential to address the tension between the contradicting needs for structure and flexibility. We interview nine professional composers. We report insights...
[hal-04497425] Resilient and Robust Strategies for Swarming Ad-hoc Networks
We investigate a set of methods aimed at enhancing the resilience and robustness of a mobile communication network, with a focus on a case involving a nanosatellite swarm network. The proposed method focuses on graph division techniques, aiming to recover from impairments while preserving the primary function or mission of the mobile network. By examining the effects of exploration and random selection algorithms on network robustness and resilience, our findings indicate that fair graph division consistently strengthens system robustness by reducing the number of packets to transmit, regardless of the algorithm employed. Additionally, our anal- ysis highlights the...
[tel-04496069] 4D Trajectories Strategic Planning under Uncertainties
To sustain the continuously increasing air traffic demand, the future air traffic management system will rely on a so-called Trajectory Based Operations (TBO) concept that will increase air traffic capacity by reducing the controllers workload. This will be achieved by transferring tactical conflict detection and resolution tasks to the pre-tactical planning phase. In this future air traffic management paradigm context, this theis presents a methodology to address such pre-tactical trajectory planning at nation-wide and continent scale. The proposed methodology aims at minimizing the global interaction between aircraft trajectories by allocating alternative departure...
[hal-04486637] Un cockpit pour l'aviation du futur ? Par quel prisme de l'IHM approcher la question ?
Cet article aborde les difficultés à engager des projets de design d'interaction dans le contexte aéronautique alors que l'avenir de ce domaine est incertain. Cette incertitude est double, avec la nécessité d'une part pour l’aviation de s’interroger sur son devenir dans un monde qui questionne les ressources disponibles et les impacts écologiques de l'aérien, et avec d'autre part l'actuelle activité de R&D vers les technologies vertes d'une industrie aéronautique qui souhaite sauver le secteur. L'article, pour illustrer ce problème, se propose de décrire un projet de design du cockpit du futur en germe dans une équipe d'IHM aéronautique, faisant face à cette double...
[hal-04486548] Un cockpit pour l'aviation du futur ? Par quel prisme de l'IHM approcher la question ?
Cet article aborde les difficultés à engager des projets de design d'interaction dans le contexte aéronautique alors que l'avenir de ce domaine est incertain. Cette incertitude est double, avec la nécessité d'une part pour l'aviation de s'interroger sur son devenir dans un monde qui questionne les ressources disponibles et les impacts écologiques de l'aérien, et avec d'autre part l'actuelle activité de R&D vers les technologies vertes d'une industrie aéronautique qui souhaite sauver le secteur. L'article, pour illustrer ce problème, se propose de décrire un projet de design du cockpit du futur en germe dans une équipe d'IHM aéronautique, faisant face à cette double...
[hal-04486196] A BENCHMARK OF THE GPS+GALILEO F9P RECEIVER
Still very few publications relate test results of multiconstellation receivers since Galileo satellites massive launch by Ariane 5, leading to more than 20 operational space vehicles in orbit. One can refer to automotive receivers and smartphones test bench made during the European COST action SaPPART (Satellite Positioning Performance Assessment for Road Transport), but this was GPS only or GPS+Glonass. This article gives an overview of a test carried out in the city of Nantes, France, and its suburban area, with a brand new receiver, F9P, of the automotive range of Ublox. The dual constellation configuration GPS+Galileo is tested. This receiver is benchmarked with...
[hal-04485071] Bayesian EM Approach for GNSS Parameters of Interest Estimation Under Constant Modulus Interference
Interferences pose a significant risk to applications that rely on Global Navigation Satellite Systems (GNSS). They have the potential to degrade GNSS performance and even result in service disruptions. The most notable type of intentional interference is characterized by a constant modulus, such as chirp and tone interferences. These interferences have a straightforward structure, leading to the creation of complex circles when attempting to identify their contribution. To address the interference and improve the situation, we calculate the maximum likelihood estimator for the relevant parameters (time delay and Doppler shift) while considering the presence of these...