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NASA's Got a Plan For a 'Galactic Positioning System' To Save Astronauts Lost in Space (space.com)
From a report: Outer space glows with a bright fog of X-ray light, coming from everywhere at once. But peer carefully into that fog, and faint, regular blips become visible. These are millisecond pulsars, city-sized neutron stars rotating incredibly quickly, and firing X-rays into the universe with more regularity than even the most precise atomic clocks. And NASA wants to use them to navigate probes and crewed ships through deep space. A telescope mounted on the International Space Station (ISS), the Neutron Star Interior Composition Explorer (NICER), has been used to develop a brand new technology with near-term, practical applications: a galactic positioning system, NASA scientist Zaven Arzoumanian told physicists Sunday (April 15) at the April meeting of the American Physical Society.
With this technology, "You could thread a needle to get into orbit around the moon of a disant planet instead of doing a flyby," Arzoumian told Live Science. A galactic positioning system could also provide "a fallback, so that if a crewed mission loses contact with the Earth, they'd still have navigation systems on board that are autonomous." Right now, the kind of maneuvers that navigators would need to put a probe in orbit around distant moons are borderline impossible.
With this technology, "You could thread a needle to get into orbit around the moon of a disant planet instead of doing a flyby," Arzoumian told Live Science. A galactic positioning system could also provide "a fallback, so that if a crewed mission loses contact with the Earth, they'd still have navigation systems on board that are autonomous." Right now, the kind of maneuvers that navigators would need to put a probe in orbit around distant moons are borderline impossible.
the plaques on the Pioneer spacecraft launched in 1972 and 1973 showed the Earth's position from 14 pulsars
GPS works by triangulating between 4-6 satellites that are all spread out. A 3d hexagon with a person in the middle somewhere.
With extra-terrestrial navigation, the person is very far outside of that hexagon. It's really hard to find an exact position when you have multiple sources that - for all intents and purposes - are co-located. Get far enough from Earth and all GPS satellites are one dot in the distance. Looks like they've found a way to use various stars as the points of that hexagon. Cool.
GPS has what, ~3/4 meters precision? That's on Earth.
This would eventually have 1 km precision in _all_ of space. Ya that's a big circle on my futuristic, hologram smartphone Goopple Maps (c), but in _all_ of space?! Damn...