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(Phys Org2)   I reject your navigation and substitute my own   (phys.org) divider line
    More: Unlikely, Global Positioning System, Chemistry, Nuclear weapon, Atom, atomic clocks, curious device, quantum sensors, vacuum chamber  
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1092 clicks; posted to STEM » on 27 Oct 2021 at 1:30 PM (4 weeks ago)   |   Favorite    |   share:  Share on Twitter share via Email Share on Facebook



18 Comments     (+0 »)
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2021-10-27 12:54:24 PM  
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2021-10-27 1:32:29 PM  
I thought at higher speeds relatively means there is no real way to know your exact navigation due to clock drift?
 
2021-10-27 2:13:27 PM  
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But seriously, if they can improve MEMs...cool.
 
2021-10-27 2:22:38 PM  

MindStalker: I thought at higher speeds relatively means there is no real way to know your exact navigation due to clock drift?


What fraction of c are you hoping to achieve?
 
2021-10-27 2:35:02 PM  
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2021-10-27 2:51:38 PM  
Sandia.

Oh, weapons systems. Spiffy.
 
2021-10-27 3:44:15 PM  

MindStalker: I thought at higher speeds relatively means there is no real way to know your exact navigation due to clock drift?


You can take that into account in the calculations. The GPS chip in your phone calculates relativistic corrections due to the satellite's speed and altitude.
 
2021-10-27 3:56:21 PM  
It's an accelerometer. That means that a small error gets accumulated to compute velocity, then accumulated again to get position. Drift rates of a few miles per hour are considered great with that kind of system. I saw a lot of trash-talking the competition (gps) without any real specs on display. This won't go anywhere but more grant proposals and fawning science-adjacent press articles for the foreseeable future.
 
2021-10-27 4:06:41 PM  

revrendjim: MindStalker: I thought at higher speeds relatively means there is no real way to know your exact navigation due to clock drift?

You can take that into account in the calculations. The GPS chip in your phone calculates relativistic corrections due to the satellite's speed and altitude.


Yes, but it would need an outside time source (like GPS) in order to compare its time drift. Its promoting a internal only navigation that uses no outside sources. Its impossible to know your speed/distance to a high degree of accuracy without knowing our relative time differential.
 
2021-10-27 4:13:01 PM  
Laser gyro navigators have existed for a long time. So have atomic clocks. Depends on what accuracy you need. Non-GPS navigators can go for a long time before they are outside of 100 feet accuracy. They slowly drift out of accuracy over time.
 
2021-10-27 4:22:01 PM  

dittybopper: [Fark user image 425x566]


I was thinking LORAN, but that works, too.
 
2021-10-27 5:00:33 PM  
So it's basically a Holocron?

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2021-10-27 5:30:12 PM  

dittybopper: [Fark user image 425x566]


No, you're not gettting sext, ant.
 
2021-10-27 6:15:24 PM  
And like a nuclear weapon, the titanium chamber must work reliably for years.

A nuke only has to work reliably for a fraction of a second.
 
2021-10-27 6:22:35 PM  
by shining lasers into small clouds of rubidium gas


Of course. Why didn't I think of that?
 
2021-10-27 6:25:31 PM  

xanadian: dittybopper: [Fark user image 425x566]

I was thinking LORAN, but that works, too.


Dead reckoning.

As in, "I reckon if I set off on that journey, I'd get lost and die.  So I'm staying home."
 
2021-10-27 6:47:29 PM  

Randrew: dittybopper: [Fark user image 425x566]

No, you're not gettting sext, ant.


I already have two.

/one is incomplete, needs mirrors.
 
2021-10-28 11:18:06 PM  

dittybopper: Randrew: dittybopper: [Fark user image 425x566]

No, you're not gettting sext, ant.

I already have two.

/one is incomplete, needs mirrors.


I have heard that it's done with mirrors.
 
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