A French pionneer in adaptive digital beamforming and STAP radar systems demonstrations, my current research activities include space-time coding for active antenna systems, and wideband unambiguous radar systems.Emeritus Professor, Radar Systems Engineering, TU Delft; Chief Scientist (retired), Thales Land & Air Systems;I have been active in- or chairing- the Technical Program Committees of most IEEE International Radar Conferences since Brest, 1999, have recently chaired the Technical Program Committee of EURAD 2012, Amsterdam, and was the Honorary Chair of SEE/IEEE International Radar Conference in France, 2014 and 2019. An author of many papers, tutorials, and patents in radar and electronic warfare, Prof. Le Chevalier is the author of a book on “Radar and Sonar Signal Processing Principles” published by Artech House in 2002, editor of “Non-Standard Antennas”, published by Wiley in 2010, co-author of "Waveform Design and Diversity for Advanced Radar Systems (Chapter 13)" , published by IET Radar, Sonar and Navigation series in 2012, co-author of “Principles of Modern Radar: Advanced Techniques (Chapter 11)”, published by Scitech, IET Publishing, 2012, and co-author of “Advanced Ultrawideband Radar: Signals, Targets, and Applications (Chapter 12)”, December 2016, CRC Press.Specialties: Radar (active and passive) and sonar signal processing, adaptive signal processing, pattern recognitionElectromagnetics, target and antennas analysis, propagation, stealth and antistealth technologiesMultisensor systems (Radar, Electronic Warfare, Communications, Optronics), design and evaluationOperational concepts, for ground surveillance, air defenseProspective, project definitionGroup management and working