As Satellite-Based Augmentation Systems (SBAS) evolve to meet ever stricter integrity and availability requirements, especially for safety-critical aviation and maritime navigation, ground-segment infrastructures must modernize accordingly. This thesis focuses on the EGNOS Navigation Land Earth Station version 3, which presents several architectural inefficiencies, including hardware obsolescence and unnecessarily redundant components, a setup that increases both cost and maintenance complexity. The proposed “NLES Light” architecture consolidates all timing outputs into a single GNSS-disciplined Rubidium oscillator and removes one receiver, integrating the signal channels of the retired receiver into the remaining unit. A systematic compatibility analysis of voltage and pulse requirements and interface protocols reduced four initial designs to the one optimal configuration, which was then validated in designed bench tests measuring clock-offset stability and pseudorange error. Results confirm that disciplining the Rubidium oscillator to the surviving receiver’s 1 PPS output fully removes any clock offset, delivers both short- and long-term stability within EGNOS specifications and preserves the retired receiver’s tracking functionality through integrated channels. The new design achieves net savings of approximately 45 000 € per station, with the potential to reach 70 000 € after minimal additional down-converter upgrades and in the governing algorithm of the station. By cutting lifecycle costs, eliminating obsolescence risks and freeing rack space, this streamlined architecture also prepares the station for future enhancements such as seamless GPS/GALILEO switching, add-on support for emerging GNSS constellations as well as software-defined upgrades, ensuring that NLES installations remain flexible and future-proof against evolving SBAS demands.