The Cost of Lunar South-Polar Geometry, and Surface Beacons as the Efficient Fix: A Dilution-of-Precision Analysis
Why the Moon's south pole needs ground beacons to get reliable GPS
Satellites in lunar orbit bunch together overhead at the south pole, creating poor positioning geometry—even a 12-satellite constellation barely matches Earth GPS performance. Adding just three ground beacons on high terrain around the pole fixes the problem almost completely, dropping positioning error tenfold and costing far less than launching extra satellites.
NASA and ESA are planning navigation systems for lunar south-pole exploration, where reliable positioning is critical for rovers and human missions. This finding shows they can achieve the necessary accuracy with far fewer orbital satellites by deploying cheap surface beacons instead—cutting launch costs and complexity while actually improving service.