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Toutes les publications de l'ENAC en direct.
All ENAC publications.

[hal-01511688] TAROT: a network for space surveillance and tracking operations

Publications ENAC - Saturday, 22 April 2017 - 03:07:48
TAROT: a network for space surveillance and tracking operations The TAROT (Télescope à Action Rapide pour les Objets Transitoires – Rapid Action Telescope for Transient Objects) network of telescopes consists of two 25cm aperture telescopes located at the Calern Observatory (TCA, OCA, France), the La Silla Observatory (TCH, ESO, Chile), and a 18cm telescope at Les Makes Observatory, (TRE, France). In addition we use the Zadko 1m telescope at the Gingin Observatory (ZDK, UWA, Australia). A central service in France, called CADOR (Centre d’Analyse des Données des Observatoires Robotiques, Centre for the Data Analysis of Robotic Observatories), acts as an interface for...

[hal-01511738] First introduction of ACM CPDLC service on ODS: a new transfer tool for controller

Publications ENAC - Friday, 21 April 2017 - 19:32:41
Towards a new reality, controller centered: a new HMI. Data Link (DL) can’t exist without an HMI, any evaluation of DL can’t be done without the evaluation of the associated HMI.

[hal-01511688] TAROT: a network for space surveillance and tracking operations

Publications ENAC - Friday, 21 April 2017 - 18:34:47
TAROT: a network for space surveillance and tracking operations The TAROT (Télescope à Action Rapide pour les Objets Transitoires – Rapid Action Telescope for Transient Objects) network of telescopes consists of two 25cm aperture telescopes located at the Calern Observatory (TCA, OCA, France), the La Silla Observatory (TCH, ESO, Chile), and a 18cm telescope at Les Makes Observatory, (TRE, France). In addition we use the Zadko 1m telescope at the Gingin Observatory (ZDK, UWA, Australia). A central service in France, called CADOR (Centre d’Analyse des Données des Observatoires Robotiques, Centre for the Data Analysis of Robotic Observatories), acts as an interface for...

[hal-01511340] A Distributed Air Traffic Flow Management Model for European Functional Airspace Blocks

Publications ENAC - Friday, 21 April 2017 - 17:41:00
Functional airspace blocks (FAB) concept is adopted by the European airspace to allows cooperation between airspace users to manage the air traffic flow, while ensuring efficiency, safety, and fairness without constraints of geographical boundaries. This integration of airspace introduces more flexibility to manage aircraft trajectory and airspace usage. In this paper, we propose a distributed air traffic flow management model to address four-dimensional trajectory planning over the European FAB. The goal is to enable effective information sharing between airspace blocks in strategic planning, and to minimize interaction between trajectories. The proposed model and...

[hal-01509893] The Invariant Unscented Kalman Filter

Publications ENAC - Friday, 21 April 2017 - 17:40:22
This article proposes a novel approach for nonlinear state estimation. It combines both invariant observers theory and unscented filtering principles whitout requiring any compatibility condition such as proposed in the -IUKF algorithm. The resulting algorithm, named IUKF (Invariant Unscented Kalman Filter), relies on a geometrical-based constructive method for designing filters dedicated to nonlinear state estimation problems while preserving the physical invariances and systems symmetries. Within an invariant framework, this algorithm suggests a systematic approach to determine all the symmetry- preserving terms without requiring any linearization and highlighting...

[hal-01503695] Enhancement of MARSALA Random Access with Coding Schemes, Power Distributions and Maximum Ratio Combining

Publications ENAC - Tuesday, 11 April 2017 - 03:01:18
Several random access (RA) techniques have been proposed recently for the satellite return link. The main objective of these techniques is to resolve packets collisions in order to enhance the limited throughput of traditional RA schemes. In this context, Multi-Replica Decoding using Correlation based Localisation(MARSALA) has been introduced and has shown good performance with DVB-RCS2 coding scheme and equi-powered transmissions. However, it has been shown in the literature that alternative coding schemes and packets power distributions can have a positive impact on RA performance. Therefore, in this paper, we investigate the behaviour of MARSALA with various coding...

[hal-01503762] Initial Assessment of the Impact of Modern Taxiing Techniques on Airport Ground Control

Publications ENAC - Tuesday, 11 April 2017 - 03:01:15
Project Modern Taxiing (MoTa) studies the impact of future taxiing technologies such as Datalink and autonomous taxiing tugs on airport taxiing operations and air traffic controller workload. Seven air traffic controllers were asked to manage ground traffic in two scenarios that imposed medium and high levels of workload with three different degrees of automated technology assistance: paper strips; Datalink and path suggestion; Datalink, path suggestion, and tugs. Initial results indicate that participants were able to manage more traffic when using either just the interface or interface and tugs, but the inclusion of tugs also resulted in an increase in self-reported...

[tel-01503414] Méthode d'accès et routage dans un réseau ad hoc aéronautique

Publications ENAC - Monday, 10 April 2017 - 16:45:07
Les systèmes de communication de l’aviation civile sont soumis à une demande de capacité toujours croissante pour répondre à l’augmentation du nombre de vols et au développement de nouveaux services. Dans ce contexte, les réseaux ad hoc aéronautiques, aussi appelés AANET (Aeronautical Ad-hoc NETwork), sont étudiés comme une solution de communication innovante et complémentaire des systèmes existants. Un AANET est un réseau ad hoc dont les nœuds sont des avions. Il exploite les capacités de communication directe entre les nœuds pour transmettre des données au delà de la portée radio en utilisant une chaîne de nœuds relais. Cette thèse a pour objectif de proposer des...

[hal-01333401] Minimax convergence rate for estimating the Wasserstein barycenter of random measures on the real line

Publications ENAC - Saturday, 1 April 2017 - 03:06:54
This paper is focused on the statistical analysis of probability measures $\bnu_{1},\ldots,\bnu_{n}$ on $\R$ that can be viewed as independent realizations of an underlying stochastic process. We consider the situation of practical importance where the random measures $\bnu_{i}$ are absolutely continuous with densities $\bfun_{i}$ that are not directly observable. In this case, instead of the densities, we have access to datasets of real random variables $(X_{i,j})_{1 \leq i \leq n; \; 1 \leq j \leq p_{i} }$ organized in the form of $n$ experimental units, such that $X_{i,1},\ldots,X_{i,p_{i}}$ are iid observations sampled from a random measure $\bnu_{i}$ for each $1 \...

[hal-01489204] Unscented Kalman Filtering on Lie Groups

Publications ENAC - Friday, 31 March 2017 - 03:09:31
In this paper, we first consider a simple Bayesian fusion problem in a matrix Lie group, and propose to tackle it using the unscented transform. The method is then leveraged to derive two simple alternative unscented Kalman filters on Lie groups, for both cases of noisy partial measurements of the state, and full state noisy measurements of the state on the group. The general method is applied to a robot localization problem, and results based on experimental data combined with extensive Monte-Carlo simulations at various noise levels show the systematic superiority of the approach over the standard UKF.
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