<p>The National Aeronautics and Space Administration (NASA), the European Space Agency (ESA), and the Japan Aerospace Exploration Agency (JAXA) are developing independent lunar navigation satellite programs to support future lunar missions. ESA's Moonlight, also known as the Lunar Communication and Navigation Services (LCNS), aims to establish a dedicated lunar navigation infrastructure. NASA's Lunar Communications Relay and Navigation System (LCRNS) provides navigation and communication services for lunar operations, while JAXA is developing its Lunar Navigation Satellite System (LNSS). In this study, LNSS (Lunar Navigation Satellite System) collectively refers to all these lunar satellite navigation constellations. Unlike Global Navigation Satellite Systems (GNSS) on Earth, LNSS positioning accuracy is expected to remain within several tens of meters due to monitoring and control limitations. This study investigates the positioning performance of an LNSS and Ultra-Wideband (UWB) network fusion to improve precise landing on the Moon. Various LNSS constellations and operational concepts were considered together with a UWB network for lunar surface operations. To design an efficient UWB layout, in-house genetic algorithms were applied by considering RF signal propagation and landing accuracy requirements. Because rover antenna coordinates may initially contain errors of several tens of meters when estimated only from LNSS and GNSS, cooperative positioning (CP) with post-processing filtering was adopted. Extended Kalman Filter (EKF)-based CP reduced positioning uncertainty, and post-processing filtering further improved accuracy to below 3 m after 30 days and below 1 m after 60 days. Simulation results show that integrating an optimized UWB network with LNSS and an altimeter achieves a 3-sigma horizontal RSS error of approximately 3–5 m and a 3-sigma vertical error below 0.5 m, satisfying ESA and NASA landing requirements.</p>