To Keep GPS Constellations From Drifting, Look To The Moon

Global Positioning Systems are a key feature in everyday life for much of the worlds population. Whether its ensuring a ship delivers its goods safely, or youre able to avoid a road closure on your commute home, GPS can help. But the system has a weakness - it relies on ground stations that could suffer from blackouts, natural disasters, or cyber attacks. And if those ground stations go offline for long enough, the whole system itself can begin to drift. Aerospace engineers have been attempting ...