Gsus4@mander.xyz to Technology@lemmy.worldEnglish · 2 months agoWorld's first GPS-free quantum navigation trial succeeds at seainterestingengineering.comexternal-linkmessage-square125fedilinkarrow-up1138arrow-down12
arrow-up1136arrow-down1external-linkWorld's first GPS-free quantum navigation trial succeeds at seainterestingengineering.comGsus4@mander.xyz to Technology@lemmy.worldEnglish · 2 months agomessage-square125fedilink
minus-squarefrongt@lemmy.ziplinkfedilinkEnglisharrow-up0arrow-down1·2 months agoThe realer play is submarines. You don’t get any satellite signal at all underwater. Before this it was only INS or dead reckoning.
minus-squareCookieOfFortune@lemmy.worldlinkfedilinkEnglisharrow-up0·2 months agoI suspect submarines can also use bottom facing radar to track features on the sea floor. But tracking the gravity should be even better.
minus-squarefrongt@lemmy.ziplinkfedilinkEnglisharrow-up0arrow-down1·2 months agoRadar is radio, just like most satellites. It doesn’t do well through water. And that would require emissions, which submarines like to avoid.
The realer play is submarines. You don’t get any satellite signal at all underwater. Before this it was only INS or dead reckoning.
I suspect submarines can also use bottom facing radar to track features on the sea floor. But tracking the gravity should be even better.
Radar is radio, just like most satellites. It doesn’t do well through water. And that would require emissions, which submarines like to avoid.