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

[hal-01702741] Enhanced widely linear filtering to make quasi-rectilinear signals almost equivalent to rectilinear ones for SAIC/MAIC

Publications ENAC - Mardi, 13 février 2018 - 17:18:18
Widely linear (WL) receivers have the capability to perform single antenna interference cancellation (SAIC) of one rectilinear (R) or quasi-rectilinear (QR) co-channel interference (CCI), a function which is operational in global system for mobile communications (GSM) handsets in particular. Moreover, SAIC technology for QR signals is still required for voice services over adaptive multi-user channels on one slot (VAMOS) standard, a recent evolution of GSM/EDGE standard, to mitigate legacy GSM CCI in particular. It is also required for filter bank multi-carrier offset quadrature amplitude modulation (FBMCOQAM) networks, which are candidate for 5G mobile networks, to...

[hal-01705847] Multi-Antenna GNSS Receiver for Space Launcher

Publications ENAC - Mardi, 13 février 2018 - 10:45:11
This paper presents a multi-antenna GNSS solution for a launch vehicle able to provide position and velocity of the launcher continuously, including during the rotation and acceleration phases of flight. The originality of this work is the development of a multi-antenna, multi-constellation (GPS/GALILEO) and multi-frequency (L1/L5) GNSS positioning solution. The multiple antenna configuration is considered in order to keep tracking a sufficient number of GNSS signals during the whole flight. Under these improved visibility conditions, a navigation solution is proposed combining data received from all antennas to estimate the position and velocity of the launch vehicle....

[hal-01704461] Beyond traditional value-of-time: passenger behavior for multimodal door-to-door travels in the age of information technologies

Publications ENAC - Lundi, 12 février 2018 - 17:38:52
Today, new services and products open a realm of possibilities to the imagination of individuals, leading to profound changes in the way we live and move. For practicality reasons, current transport models usually consider individual transport modes with the attributes of monetary costs and time costs, using the value of time savings of travellers. This leads to the supremacy of speed in models of passenger behaviour and in the evaluation of transport infrastructure project. However, today people seem to consider other attributes than just price and time of travel. Moreover they usually string together several transport modes from the origin to the destination, and take...

[tel-01703861] Aircraft Route Network Optimization in Terminal Maneuvering Area

Publications ENAC - Vendredi, 9 février 2018 - 14:52:54
in Terminal Manoeuvring Area (TMA) at hub airports is the main problem in Chinese air transportation system. At most of the hub airports, the capacity is near saturated or even overloaded. Civil Aviation Administration of China (CAAC) reported that Air Traffic Management (ATM) is the main cause of delays. Despite the already overloaded ATM system, the Chinese airplanes fleet is continuing to expand. China will become the largest traffic flow in the world before the end of 2035. There is an urgent need to develop a new more efficient method for sequencing and merging arrival flows in TMA, so that airports can maximise the benefits from the emerging Communication,...

[hal-01693255] Using Ground Transportation for Aviation System Disruption Alleviation

Publications ENAC - Mardi, 6 février 2018 - 14:54:49
We investigate whether passenger delays and airline costs due to disruptive events affecting European airports could be reduced by a coordinated strategy of using alternative flights and ground transportation to help stranded passengers reach their final destination, using Airport Collaborative Decision Making concepts. Optimising for airline cost for hypothetical disruptive events suggests that, for airport closures of up to 10 hours, airlines could benefit from up to a 20% reduction in passenger delay-related costs. Mean passenger delay could be reduced by up to 70%, mainly via a reduction in very long delays.

[hal-01700314] A case study : Influence of Dimension Reduction on regression trees-based Algorithms -Predicting Aeronautics Loads of a Derivative Aircraft

Publications ENAC - Lundi, 5 février 2018 - 17:51:51
In aircraft industry, market needs evolve quickly in a high competitiveness context. This requires adapting a given aircraft model in minimum time considering for example an increase of range or the number of passengers (cf A330 NEO family). The computation of loads and stress to resize the airframe is on the critical path of this aircraft variant definition: this is a consuming and costly process, one of the reason being the high dimen-sionality and the large amount of data. This is why Airbus has invested since a couple of years in Big Data approaches (statistic methods up to machine learning) to improve the speed, the data value extraction and the responsiveness of...

[tel-01698442] Essays on Delay Reduction Contract, Airline Networks and Agricultural Land Marketization

Publications ENAC - Vendredi, 2 février 2018 - 18:28:40
This thesis consists of three self-contained papers, each of which corresponds to one chapter. The first chapter, jointly written with Estelle Malavolti, studies the optimal design of delay reduction contract signed between an ANSP and a monopoly airline. In the contract design, we mainly consider the adverse selection problem. Moreover, we conduct comparative-static analysis to study the effects of safety standard and flight frequency on optimal contracts. Besides, we use numerical examples to study when a welfare-maximizing ANSP has to use public funds to provide the service. The second chapter investigates the dual roles of congestion delays and horizontal product...

[hal-01333401] Upper and lower risk bounds for estimating the Wasserstein barycenter of random measures on the real line

Publications ENAC - Mardi, 30 janvier 2018 - 12:53:06
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-01682632] An analysis of the impact of larger aircraft (A-380) on flight frequency

Publications ENAC - Vendredi, 26 janvier 2018 - 10:36:18
Innovations in the airline industry can have a significant impact on the behavior of air transport stakeholders: airline companies, airports and passengers. In this paper, we consider the introduction of a double-deck plane, the A-380, which is currently the largest aircraft available. Due to its size, it is able to carry at once approximately twice as many passengers as any other medium-sized aircraft. When associated with a reduction in flight frequencies , the operation of such aircraft is expected to lower the environmental impact. However, flight frequency depends on factors others than the aircraft size, such as airport fees, demand and strategic decisions of...
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