Radionavigation System Engineer
Dr. Ridha Chaggara Born: February the 12th 1976 Citizenship: French 31200 Toulouse-France : +33 664 49 50 40 :
[email protected]
Profile
PhD in satellite communication systems, high level qualification and experience on major today’s space navigation and aeronautical technologies. Involvement in several projects and studies related to advanced satellite radionavigation technologies. Proven analysis and solving capabilities. Team player with great communication skills.
Areas of Expertise Experience
in satellite navigation technologies: system design and evolution, signal processing and algorithm design, Involvement in several European projects related to space and ground based augmentation systems (SBAS, GBAS…), Experience in Radionavigation Quality of Service for Aeronautics and safety of Life applications. Background on Fixed and Mobile satellite communication systems and networks, Background on advanced waveform design, Information theory, transmission technologies and user access modes, Competency in Terrestrial mobile communication systems and standards (3GPP, CDMA, GSM).
Tools and Computer Sciences Operating
Systems: windows series, Linux, Unix C, C++, Matlab, Simulink Signal Processing workstation (SPW) Ms Office, Lotus notes, Latex, Tex2html, Doors Laboratory Simulations: RF and HF components, spectrum analyzer (Rohde and Schwarz), channel simulator, noise generator (HP), DVB-SH modulator and receiver Programming:
Experiences and Projects
10/2008 – Present day: EGNOS System Architect, Thales Alenia Space Analysis
of major EGNOS evolutions, their implementation and impact on service quality; updating EGNOS documents (DJF, SRD, DCN to PIDS and SOC to SRD), Analysis of EGNOS Non-Conformance related to messages MT9/MT17 and impact assessment on SoL service quality. Operational work-around currently under design jointly with ESSP, Deployment of Inmarsat IV satellite for EGNOS: Impact on system and subsystems behavior in a single frequency mode, technical recommendations to be implemented in next EGNOS release, EGNOS extension over Africa and Middle-East: Analysis and study of the feasibility with Message Type 27 and 28, system performance overview, parameters setting and Impact on the ECAC area, Analysis of System Re-Qualification following RIMS upgrade and modification: Design of an approach/strategy aiming at efficient system re-qualification without service interruption or degradation. 06/2008-10/2008 Satellite/Mobile Satellite Engineer: CNES Study
of the antenna diversity technique: application to DVB-SH for satellite mobile video broadcast, simulation of the implemented technique with Modulator, Receiver (Teamcast products) channel simulator and network manager (UDCAST).
Laboratory
06/2006-06/2008: Radionavigation Engineer: AIRBUS Industries Toulouse Involvement
on research activities related to advanced satellite and ground navigation systems for aeronautic applications, Analysis and study of the ground based augmentation systems (GBAS) for CAT II-III approaches with C/A civil signals, Algorithm Design for GNSS position consolidation to mitigate the impact of single MMR hardware failure on user integrity (Patented), Multi-standard antenna installation constraints on airbus aircrafts: solution analysis and feasibility assessment, Application of satellite mobile systems for aeronautic, the case of Iridium and Globalstar: assets and technical limitations analysis.
12/2005- 07/2006: 3G Base-Band Engineer, NXP Design
and development of a downlink inner and outer loop power control algorithms in case multiple channels communication for third generation mobile systems (UMTS), Algorithm testing (real time) in NXP laboratory with Base Station simulator (Agilent), channel simulator and the 3GPP receiver board, Analysis and assessment of the impact of Signal to Noise Ratio estimation algorithms on the power control algorithm performance and behavior. 03/2005- 12/2005: Radionavigation Engineer, ESA/TeSA/GMV Work
on the European project of Neural Network for Radionavigation in collaboration with European Space Agency (ESA), TeSA Laboratory and GMV (SPAIN), Design, development and validation of fully functional Neural Networks based algorithms embedded into a GNSS navigation receiver for Multipath mitigation for LEO applications, Publication on international dedicated conferences and workshops.
Education Background 11/2001- 12/2004: PhD in Satellite Communications and Channel Coding: ENST Paris, Graduated with Honor Thesis
achieved in collaboration with, and sponsored by Thales Alenia Space and the French Space Agency (CNES), Study of the state of-the-art fades mitigation techniques for GEO satellite communication systems (power control, data and code rate variation, site and satellite diversity…), Proposal of adaptive coded continuous phase modulation technique based on iterative decoding to mitigate channel fading: Application for Ka Band multimedia applications, Comparisons with ETSI Standards (DVB-RCS and DVB-S2) for fade mitigation capacities, Publications on major International dedicated conferences (ESA Conference, EUSIPCO, AIAA…). 11/1998-07/2001: Engineering Diploma in digital communications: French Aviation School ENAC Toulouse France, Courses
on signal processing for communication and networks (modulations, signal transmission and access modes), Courses on Satellite Communication Systems and standards (VSAT, DVB Series…), Internship with French Civil Aviation Authorities: Design of Least Square based Algorithms for Multipath mitigation using GPS multi-correlator receivers (Novatel Millennium).
Patents Method and device for determining a consolidated position of a moving body, in particular of an aircraft: Ridha Chaggara & Alain Guillet, Airbus industries.
Languages Arabic: Mother Tongue French: Fluent English: Fluent Italian: Basic Knowledge
