NASA has tested a navigation system that lets satellites determine where they are without GPS by treating other spacecraft and debris as landmarks, while refining more than 200 object orbits in three days

NASA has tested FALCON, a system that lets satellites navigate without GPS by using other spacecraft and orbital debris as reference points. During a three-day test, the system autonomously improved the known orbits of more than 200 space objects while also calculating the position of NASA’s Starling spacecraft.
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