GPS technology faces potential drift issues and lunar solutions

The Global Positioning System (GPS) is a satellite-based navigation network operated by the U.S. Space Force. It utilizes a constellation of over 30 satellites orbiting approximately 20,000 kilometers above Earth to provide precise location, velocity, and time data to receivers worldwide.

While highly reliable, the system faces technical vulnerabilities. Traditional Earth navigation constellations rely on ground stations that are susceptible to cyberattacks, natural disasters, or blackouts. If these stations go offline, the satellites can experience “drift,” a phenomenon known as orientational rank deficiency, where satellites in an orbital shell drift relative to their position on the ground, introducing position errors.

A research team from the Shanghai Engineering Center for Microsatellites has proposed a solution to mitigate this drift. Their research suggests linking GPS satellites with satellites in orbit around the Moon to help maintain absolute positioning in space and counteract the errors that occur when ground-based links are interrupted.