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Gsus4@mander.xyz to Technology@lemmy.worldEnglish · 2 days ago

World's first GPS-free quantum navigation trial succeeds at sea

interestingengineering.com

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World's first GPS-free quantum navigation trial succeeds at sea

interestingengineering.com

Gsus4@mander.xyz to Technology@lemmy.worldEnglish · 2 days ago
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GPS-free navigation at sea was demonstrated using quantum sensors that measure gravitational field changes to determine their location.
  • Knock_Knock_Lemmy_In@lemmy.world
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    1 day ago

    Why do we expect this quantum map of gravity and magnetic fields to be permanent?

    • frongt@lemmy.zip
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      Why do you think they expect it to be permanent? We survey all kinds of stuff like this all the time.

      • Knock_Knock_Lemmy_In@lemmy.world
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        1 day ago

        Geography and celestial maps are permanent (mostly).

        The next question is, how long until a quantum measured map becomes unrecognised? Is the half life years or hours?

        • Natanael@infosec.pub
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          7 hours ago

          There’s literally whole projects to map out movements of continents and the change of the geoid shape of earth, although it takes a few years for it to matter in most cases

          • Knock_Knock_Lemmy_In@lemmy.world
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            7 hours ago

            Unless there is volcanic activity, geography can be considered permanent within a lifetime. Given the accuracy this technology claims, I suspect the lifespan is very short lived.

            • Natanael@infosec.pub
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              2 hours ago

              https://www.djublonskopf.com/2014/09/02/how-do-we-know-the-continents-are-moving/

              Multiple centimeters per year isn’t nothing but it is enough to force recalibration within your lifetime, multiple times

              You don’t use those kinds of sensors non-stop from one calibration. You recalibrate and update maps regularly. Then if you lose some sensors you can still read reckon with high enough precision for weeks

        • silicon@lemmy.dbzer0.com
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          1 day ago

          I’m guessing remote sensing will be involved with keeping the maps accurate.

    • some_kind_of_guy@lemmy.world
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      It is not permanent, but the changes are slow enough

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