TOMBAKDJIAN , Lionel

This thesis, titled "Multibeam Beamforming Antennas for Navigation" focuses on developing advanced antennas capable of beamforming in the L-band for Global Navigation Satellite System (GNSS) signals, aiming to enhance reliability and performance in diverse scenario. To achieve this, two innovative approaches have been implemented: a phased...

This paper presents the experimental measurement of antenna diversity on a 868MHz LP-WAN gateway. Colinear dipole with 6dBi gain are placed in different orientation to study polarization effect. Different scenario including indoor and outdoor are performed and diversity gain is computed.Results show a diversity gain is ranging from 3 to 4 dB...

In this study we present a novel approach to enhance GNSS (Global Navigation Satellite System) signal re- ception by using a phased array antenna system. This antenna system is composed of two main parts which are the radiating elements and the beamforming circuits. This study delves into the design and testing of the system using a GNSS simulator.

In this study we present a novel approach to enhance GNSS (Global Navigation Satellite System) signal reception by using a phased array antenna system. This antenna system is composed of two main parts which are the radiating elements and the beamforming circuits. This study delves into the design and testing of the system using a GNSS simulator.

In this work, the performances of different antenna polarization, including linear and circular, in a Low Power Wide Area Network (LPWAN) scenario is studied experimentally . The Industrial Scientific and Medical (ISM) 868MHz unlicensed band is targeted with LoRa modulation. The terminals used for test are compact and representative of industry...

Global Navigation Satellite Systems (GNSS) have become indispensable for numerous applications, ranging from the synchronization of critical infrastructure to precise navigation applications. It is imperative to establish reliable monitoring systems that ensure the dependability and security of satellite constellations, given society's...

Global Navigation Satellite Systems (GNSS) are now essential in our modern life: from synchronizing vital infrastructure to accurate navigation. Robust monitoring systems are required to guarantee the dependability and security of satellite constellations as society depends more and more on GNSS for precise positioning, timing, and navigation....

Global Navigation Satellite Systems (GNSS) have become indispensable for numerous applications,ranging from the synchronization of critical infrastructure to precise navigation applications. It isimperative to establish reliable monitoring systems that ensure the dependability and security ofsatellite constellations, given society's increasing...

International audience

High accuracy Global Navigation Satellite System (GNSS) refers to the use of advanced technology and techniques to improve the precision and accuracy of position, navigation, and timing information typically in centimeter or subcentimeter level, which is suitable for various applications such as surveying, agriculture, autonomous vehicles and...

The Global Navigation Satellite System (GNSS) has become an integral part of modern society, with applications ranging from navigation in vehicles and on foot, to tracking the movement of goods and people. Over the past few years, there has been a significant increase in the use of GNSS and for precise positioning and timing in a variety of...

In this paper, we introduce new correlation technologies for measuring Power-Density of mobile devices in the framework of Over The Air (OTA) testing. The correlation technologies use convolutional signal processing algorithms. Measurements obtained using minimally invasive ElectroOptical (EO) probes are compared to those from classical...

In this paper, we introduce correlation technologies both at RF/mmWave and Base-Band frequencies. At RF and mmWave frequencies power-spectra and energy-spectra metrics are introduced for measuring the power-density of mobile devices and systems. The use of unified power-spectra and energy-spectra metrics leads to innovative...