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Lionel Ries


Lionel Ries is head of the location/navigation signal department in CNES, the French Space Agency.

The department's activities cover signal design and processing, receivers and payloads involving location, and navigation systems including GNSS (Galileo, GNSS space receivers), search and rescue by satellite (Cospas-Sarsat, MEOSAR), and Argos (advanced data collection and location by satellite, mostly for environment and wildlife monitoring). He also coordinates CNES research activities for future location/ navigation signals, user segment equipment, and payloads.

He contributed to the invention of the CBOC signal, and provided support to the 2004 US-EU agreement on GPS and Galileo. He was responiable for the development of the L1-L2C signal processing algorithms now implemented in the ASIC and processor of the TOPSTAR 3000 receiver, in the frame of a CNES R&D activity.

He graduated from the Ecole Polytechnique de Bruxelles, at Brussels Free University, and received an M.S. degree from the Ecole Nationale Superieure de l’Aeronautique et de l’Espace (Supaero ) in Toulouse.

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