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Conference Paper

Early and Robust Detection of Oscillatory Failure Cases (OFC) in the Flight Control System : A Data Driven Technique

Author: Urbano Simone

In Proc. 55th AIAA Aerospace Sciences Meeting, Grapevine, Texas, USA, January 9-13, 2017.

Talk

Les produits d’intermodulation passifs (PIM) dans les charges utiles de satellites de télécommunication

Author: Sombrin Jacques B.

Seminars of TeSA, Toulouse, December 7, 2017.

Optimisation de la gestion des ressources de la voie retour d’un satellite multi-faisceaux

Author: Couble Yoann

Seminars of TeSA, Toulouse, December 7, 2017.

Conference Paper

Channel Estimation and Equalization for CPM with Application for Aeronautical Communications via a Satellite Link

Authors: Chayot Romain, Thomas Nathalie, Poulliat Charly, Boucheret Marie-Laure, Van Wambeke Nicolas and Lesthievent Guy

In Proc. Military Communications (MILCOM), Baltimore, USA, October 23-25, 2017.

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In this paper, we present a generalized polyphase representation for Continuous Phase Modulation (CPM) signals suited to the detection over frequency-selective channels. We first develop two different equalizers based on this representation and relate them to the State of Art. We also derive a Least Squares (LS) channel estimation and an improved LS estimation using a priori on the channel. Simulation results show the equivalence between existing equalizers and also show that our channel estimation leads only to a small degradation in term of Bit Error Rate (BER) in the case of an aeronautical communication over a satellite link.

Digital communications / Aeronautical communication systems and Space communication systems

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Talk

Estimation parcimonieuse et navigation par satellites

Author: Lesouple Julien

Seminars of TeSA, Toulouse, October 19, 2017.

Interaction protocoles de transport/fiabilisation MAC pour service mobile par satellite

Author: Tauran Bastien

Seminars of TeSA, Toulouse, October 19, 2017.

Conference Paper

Un algorithme de reconstruction dans le cas d’un échantillonnage non ponctuel, périodique ou non

Authors: Bonacci David and Lacaze Bernard

In Proc. Groupement de Recherche en Traitement du Signal et des Images (GRETSI), Juan-Les-Pins, France, September 5-8, 2017.

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Les composants électroniques destinés à l’échantillonnage haute fréquence des signaux ont des temps de réponse susceptibles de dégrader les performances des algorithmes de reconstruction. Dans cet article, on considère un signal échantillonné par un composant modélisé par un filtre linéaire invariant activé à des instants potentiellement irréguliers et qui forment une suite vérifiant la condition de Landau (généralisation de la condition de Nyquist). On étudie les conséquences des imperfections des échantillonneurs dans la reconstruction du signal et dans l’estimation de l’enveloppe et de la phase.

Signal and image processing / Space communication systems

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Sur l’égalisation fréquentielle des modulations à phase continue

Authors: Chayot Romain, Thomas Nathalie, Poulliat Charly, Boucheret Marie-Laure, Van Wambeke Nicolas and Lesthievent Guy

In Proc. Groupement de Recherche en Traitement du Signal et des Images (GRETSI), Juan-Les-Pins, France, September 5-8, 2017.

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Dans cet article, nous proposons d’étudier différents algorithmes d’égalisation pour signaux à Modulation de Phase Continue (continuous phase modulation, CPM) dans le domaine fréquentiel à l’aide d’une représentation polyphase du signal. Par cette approche unifiée, nous montrons l’équivalence analytique de ces égaliseurs sous certaines hypothèses liées au canal de transmission, les liens, ainsi que leurs limitations dans certains cas.

Digital communications / Aeronautical communication systems and Space communication systems

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Journal Paper

A Data-Driven Approach For Actuator Servo Loop Failure Detection

Authors: Urbano Simone, Chaumette Eric, Goupil Philippe and Tourneret Jean-Yves

IFAC-PapersOnLine, vol. 50, Issue 1, pp. 13544-13549, July, 2017.

This paper studies a data-driven approach to detect faults in flight control systems of civil aircraft. A particular class of failures, referred to as Oscillatory Failure Cases (OFC), impacting the actuator servo loop has motivated the authors to consider a data-driven approach based on distance and correlation measures (see reference [Goupil et al.(2016). A data-driven approach to detect faults in the Airbus flight control system. IFAC-PapersOnLine, 49(17), 52-57] of this paper) leading to promising results compared to the state-of-the-art methods based on analytical redundancy. The present paper extends the formulation and the results of the considered OFC detection approach investigating Support Vector Machine (SVM) techniques to define a more accurate detector based on distance and correlation measures.

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Conference Paper

Shape Effects on Sampling of Stationary Processes

Authors: Bonacci David and Lacaze Bernard

In Proc. Sampling Theory and Applications (SampTA), 12th International Conference, Tallinn, ESTONIA, July 3-7, 2017.

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Acquisition devices play an important role in digital signal processing. The possibility of a perfect reconstruction is demonstrated in regular as well as irregular sampling when the number of samples in the observation interval is high enough in function of the bandwidth of the sampled signal (length of the support of the spectrum). In the case of high sampling rates, imperfections of acquisition devices can introduce non negligible errors (when the acquisition duration of a given sample becomes not negligible in comparison with the sampling period (or mean sampling period in the case of irregular sampling). In this paper, explicit method is proposed to take into account imperfections of the sampling device in order to improve the reconstruction of the signal. The proposed method is applicable for deterministic functions and random processes in the case of regular sampling, as well as irregular sampling.

Signal and image processing / Space communication systems

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Happy new year!

PhD positions available at TeSA

PhD subjects available on the CNES site.
On line application before the 31rst of March.

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Activity Report

The TeSA activity report 2015-2016 is available. Feel free to download and enjoy the reading!

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