Atika Rivenq - Academia.edu (original) (raw)

Papers by Atika Rivenq

HAL (Le Centre pour la Communication Scientifique Directe), 2011

Enhancing user safety constitutes a major issue in railway transport. In this paper, a novel solu... more Enhancing user safety constitutes a major issue in railway transport. In this paper, a novel solution for detection and identification of objects falling on railway tracks is proposed. This solution is based on a system using a set of consecutive ultra wideband (UWB) monostatic radars fed by a common transmission line. The main objective of this work is to study the different radiofrequency and signal processing subsets in order to evaluate and validate the full system. A slotted waveguide operating in its fundamental mode is used as the common transmission line. Slots are periodically perforated in the waveguide to constitute the monostatic radars. The Singularity Expansion Method (SEM) is used to characterize the objects falling on railway tracks. Complex Natural Resonances are then computed or measured and stored in a library. They are used in a specific discrimination process. Using both numerical simulations and experimental results, the discrimination process shows that human bodies are well detected and distinguished as well as other objects typically found on platform (suitcases, bottles.. .

HAL (Le Centre pour la Communication Scientifique Directe), 2011

HAL (Le Centre pour la Communication Scientifique Directe), 2008

HAL (Le Centre pour la Communication Scientifique Directe), 2009

HAL (Le Centre pour la Communication Scientifique Directe), Nov 19, 2014

HAL (Le Centre pour la Communication Scientifique Directe), 2011

Several techniques have been developed for position location in a two dimension (2-D) system but ... more Several techniques have been developed for position location in a two dimension (2-D) system but few techniques have been done in a three dimension (3-D) context. Some of the techniques and algorithms proposed for 3-D are often subject to accuracy problems. We propose in this paper a novel technique of 3-D indoor position location. This method relies on techniques for ultra wide band (UWB) transmissions. The location algorithm is in terms of time difference of Arrival (TDOA). Numerical simulations show that the proposed approach improves precision of 3-D position location.

HAL (Le Centre pour la Communication Scientifique Directe), 2012

Radars and their applications were, for a long time, reserved to national defense, air security o... more Radars and their applications were, for a long time, reserved to national defense, air security or weather service domains. For a few years, with the emergence of new technologies, radar applica- tions have been developed and have become known in the civil domain. In particular, the arrival of UWB—Ultra-Wideband technology allows the design of compact and low-cost radars with multi- ple fields of application. In this paper, we focus on road applications, such as driving assistance with the objective of increasing safety and reducing accidents. In classical UWB radar systems, Gaussian and monocycle pulses are commonly used. In previous works, original waveforms based on orthogonal functions (Hermite and Gegenbauer) were proposed. These provide a good spatial resolution, suitable for radar detection. Another advantage of these waveforms is their multiple access capability, due to their orthogonality. The aim of the study presented in this article is to compare simulation and experimental results obtained, especially for short-range anticollision radar application, using these waveforms in one part and Gaussian and monocycle pulses in the other part. The originality of this paper relies on the new approach. Indeed, this comparison study using these waveforms has never been done before. Finally, some examples of real experiments in a real road environment with different waveforms are presented and analysed.

HAL (Le Centre pour la Communication Scientifique Directe), Jul 1, 2016

HAL (Le Centre pour la Communication Scientifique Directe), 2011

InTech eBooks, Oct 10, 2012

Dr. Fouzia Elbahhar Boukour was born in 1975. She received the M.S and Ph.D degrees form the Univ... more Dr. Fouzia Elbahhar Boukour was born in 1975. She received the M.S and Ph.D degrees form the University of Valenciennes (France) in 2000 and 2004, respectively. She is actually employed as researcher at IFSTTAR/ LEOST, Villeneuve d'Ascq, France. Fouzia Boukour is author or coauthor of more than 50 research papers, including journal articles, book chapters and conference proceedings. She participates at many national and European projects dedicated to transport applications. She serves also as a reviewer for several journals and international Conference. She is involved in signal processing especially Ultra wide band technology. Her major research interests are land transportation like Communication Vehicle to Vehicle and vehicle to XII Preface In this book, the chapters are organised in three main topic areas: Section 1: "Satellite Systems for Positioning" consists of chapters which cover whole satellite system (GPS, GNSS) and some applications using this system. It consists of three chapters. The first chapter is related to the satellite Localization system especially The GNSS system. In fact, the authors present some results in terms of precision related the application the GNSS receivers in agricultural applications. The second chapter presents new concepts to calculate the coordinates of GNSS stations, existing in some countries, in the international reference systems using information and applying a methodology of rigorous processing and adjusting. This technique has proved to be advantageous when the objective is to introduce the Reference System simultaneously with the precision and parameters estimation. The last chapter of this section deals with the use of GPS technology in the determination of the one-way speed of light. Section 2: "Wireless Sensor Network Localization Techniques", is dedicated to the Localization applications using the wireless sensor networks. The section consists of five chapters. The first chapters are related the applications of UWB Localization system especially applied to building construction environments and the transport applications. The third chapter is related to the capacitive transmit-mode measurement methods that can be used to passively track an individual indoors in three dimensions and nonintrusive. The fourth chapter is dedicated to the concepts for an indoor Localization system suitable for a Wireless Sensor Network in a GPS-denied scenario way. The last chapter is dedicated to the off-the-shelf positioning system using IEEE802.11 wireless local area network technology without any additional devices. Section 3: "Coupled GPS and other sensors", consists of three chapters. The first two chapters present some results for Inertial Navigation System/GPS association and some applications of this coupling. The last chapter discusses some interesting results concerning the development and implementation of a "System On Programmable Chip" SOPC based on portable positioning systems PPS, which is capable of handling the datafused positioning and can provide user a feasible way to obtain their position anywhere. The editor would like to thank all authors for their contribution, and all those people who directly or indirectly helped make this work. We hope the information included will be useful for Communication & Localization Engineers, Signal Processing Engineers and the academic researchers occupied in the field of indoor and outdoor Localization systems.

HAL (Le Centre pour la Communication Scientifique Directe), 2012

Materials Today: Proceedings

SSRN Electronic Journal, 2022

HAL (Le Centre pour la Communication Scientifique Directe), 2012

Energies, 2022

Vehicular ad hoc networks allow vehicles to share their information for the safety and efficiency... more Vehicular ad hoc networks allow vehicles to share their information for the safety and efficiency of traffic purposes. However, information sharing can threaten the driver’s privacy as it includes spatiotemporal information, and the messages are unencrypted and broadcasted periodically. Therefore, they cannot estimate their privacy level because it also depends on their surroundings. This article proposes a centralized adaptive pseudonym change scheme that permits the certificate’s authority to adjust the pseudonyms assignment for each requesting vehicle. This scheme adapts dynamically depending on the density of the traffic environment and the user’s privacy level, and it aims to solve the trade-off problem between wasting pseudonyms and Sybil attack. We employ a Knapsack problem-based algorithm for target tracking and an entropy-based method to measure each vehicle’s privacy. In order to demonstrate the applicability of our framework, we use real-life data captured during the inte...

2016 International Conference on Electrical Sciences and Technologies in Maghreb (CISTEM), 2016

The work presented in this paper is part of general study concerning the connected wagon. The obj... more The work presented in this paper is part of general study concerning the connected wagon. The objective is to ensure communications of data associated to wagon (contents, location The aim of this study is to find the most appropriate technology to design a wireless communication between wagons or between wagon and infrastructure. This analysis takes into account railway and embedded systems constraints such as severe electromagnetic environment and low power consumption. The paper presents, at the first part, a state of the art of existing technologies. The second part describes the used technology (ZigBee) and their performances in propagation environment.