Lunar Relativistic Positioning System

LUREPOS is an ESA-selected lunar mission concept for a pair of small satellites, sized approximately 6U to 12U, that would test autonomous lunar orbit determination using proper times and pseudoranges without clock synchronisation. The proposed two-spacecraft system would provide a navigation technology demonstrator for safe lunar landings, precise manoeuvring, and future Moon, Mars, and Earth navigation architectures. ESA’s OSIP mission outline estimated a 2028–2029 launch path, while the agency’s 2025 small-missions overview records the mission study and subsequent selection process; this row preserves LUREPOS as a development-stage concept rather than a funded or flown mission.