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snacks

Snacks

Ok, but how does the gps satellite know where it is?
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desea@snug.moe

desea

Reply to @snacks

@snacks it doesnt

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desea@snug.moe

desea

Reply to @desea@snug.moe

@snacks it doesnt need to know where it is, thats for the ground device to figure out

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snacks

Snacks

Reply to @desea@snug.moe
@desea so the ground device needs a database with the trajectory of all the satellites and accurate timekeeping? Idk how else youcd go from knowing what satellites are over you to knowing where you are
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snacks

Snacks

Reply to @snacks
@desea i should just read this up ig
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fiore@brain.worm.pink

φ

Reply to @desea@snug.moe

@desea @snacks it only needs to know where it isnt. by knowing where it isnt, the satellite knows where it is

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snacks

Snacks

Reply to @snacks
Edited 17 days ago
@desea the satellites broadcast their position tho? Apparently they use time of flight triangulation with ground stations to figure out their own position, so the same principle receivers use which seems like an obvious solution in hindsight
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Clover@akko.wtf

Clover

Reply to @snacks

@snacks it knows where it isn’t

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desea@snug.moe

desea

Reply to @snacks

@snacks huh, fair enough then, shouldnt trust everything you read online ig

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snacks

Snacks

Reply to @desea@snug.moe
@desea i'm wondering what your information was on how this works. I obv also got mine online and i got one source on this since everyone just explains how to figure out where you are relative to the sattelites, which doesn't get you far with ones that aren't geosynchronous
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desea@snug.moe

desea

Reply to @snacks

@snacks i didnt even know about non geosynchronous gps satellites

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nerthos@shitposter.world

Khamenei's Top Guy Katze Kattepus crusaderkitty

Reply to @snacks
@snacks @desea The satellite knows where it is at all times. It knows this because it knows where it isn't. By subtracting where it is from where it isn't, or where it isn't from where it is (whichever is greater), it obtains a difference, or deviation.
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