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Utilisation du chaos pour améliorer l'estimation du temps d'arrivée dans le cas multi-utilisateur : application à un système de télémétrie de type UWB

Hang Ma 1
1 LAAS-MAC - Équipe Méthodes et Algorithmes en Commande
LAAS - Laboratoire d'analyse et d'architecture des systèmes
Abstract : In the coming decades, highly accurate position information has the potential to create revolutionary applications in the social, medical, commercial and military areas. Ultra-Wideband (UWB) technology is considered as a potential candidate for enabling accurate localization capabilities through Time-of-Arrival (TOA) based ranging techniques. Over the past decade, chaotic signals have received significant attention due to a number of attractive features. Chaotic signals are aperiodic, deterministic, and random-like signals derived from nonlinear dynamical systems whose good autocorrelation, low cross-correlation and sensitivity to the initial conditions make them particularly suitable to ranging systems. In this thesis, two new multiuser TOA estimation algorithms are proposed with low complexity and robustness to MUI, the number of users supported by which is much larger than current multiuser TOA estimators. While, the use of classic spreading sequences and ranging pulse constrain the further improvement of ranging performance and system capacity. For breaking through the limit brought by the classic signals, the selected chaotic signals are employed as the spreading sequences or ranging pulse in our proposed algorithms. With the use of chaotic signals, our proposed algorithm not only obtains the additional improvement, but also with capability to support larger number of users comparing with its counterpart using classic signals.
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https://tel.archives-ouvertes.fr/tel-01067173
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Submitted on : Tuesday, September 23, 2014 - 10:22:37 AM
Last modification on : Thursday, June 10, 2021 - 3:07:02 AM

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  • HAL Id : tel-01067173, version 1

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Hang Ma. Utilisation du chaos pour améliorer l'estimation du temps d'arrivée dans le cas multi-utilisateur : application à un système de télémétrie de type UWB. Automatique. INSA de Toulouse, 2014. Français. ⟨tel-01067173⟩

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