Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
Tip your server.

idea: add, search, annotate, link, view, overview, recent, by name, random

meta: news, help, about, links, report a problem

account: browse anonymously, or get an account and write.

user:
pass:
register,


         

quantum GPS

Quantum GPS
 
(0)
  [vote for,
against]

Hey,

Maybe one day we can quantum entangled two clocks and have a super accurate GPS system.

(by clocks I mean maybe atomic ones, or even quantum entangle two particles that are attached to quantum computers)

vtolled, Aug 25 2014


Please log in.
If you're not logged in, you can see what this page looks like, but you will not be able to add anything.



Annotation:







       I think this one requires somewhat more explanation. Is the idea to use super accurate pulse timing for positioning?
MechE, Aug 25 2014
  

       Is timing the limiting parameter on present GPS?
MaxwellBuchanan, Aug 25 2014
  

       Apparently one of them, but not the major one, and it can be corrected down to the centimeter level by using multiple different frequencies. An alternate approach is (if I'm reading it correctly) to use a fixed base station to broadcast correction factors. This also helps correct for signal propagation delays (speed of light in atmosphere being unequal to the speed of light in a vacuum)   

       The more significant issue is shadowing and reflection. If all the satellites your reciever locks onto are on one side (as if, say, you are standing in the shadow of a mountain), the accuracy gets much worse. Likewise, in that same position, a reflected signal from a satellite off the mountain can make the data worse.   

       I mean we've already got clocks accurate enough to require automatic correction for relativistic effects at orbital velocities (0.014 seconds/year months at ISS altitude, 4e-10s/s).
MechE, Aug 25 2014
  

       Or is part of a marine chronometer for determining longitude?
the porpoise, Aug 25 2014
  


 

back: main index

business  computer  culture  fashion  food  halfbakery  home  other  product  public  science  sport  vehicle