Author Topic: Sub-inch Accuracy GPS or Alternatives  (Read 1156 times)

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Offline Builder1Topic starter

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Sub-inch Accuracy GPS or Alternatives
« on: October 26, 2010, 04:58:35 PM »
Hi all,
Does anyone know if there is such a thing as a cheap gps that is accurate down to below an inch? If such a thing is not available are there alternatives? Any help will be greatly appreciated, thanks.

Builder1

Offline knossos

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Re: Sub-inch Accuracy GPS or Alternatives
« Reply #1 on: October 26, 2010, 05:32:48 PM »
You won't get sub-inch accuracy from GPS.  Are you sure you even need that kind of accuracy?  Given more information we could probably point you in a better direction.
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For the greatest tragedy of them all
Is never to feel the burning light."
 
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Offline madsci1016

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Re: Sub-inch Accuracy GPS or Alternatives
« Reply #2 on: October 26, 2010, 05:41:10 PM »
Hi all,
Does anyone know if there is such a thing as a cheap gps that is accurate down to below an inch? If such a thing is not available are there alternatives? Any help will be greatly appreciated, thanks.

Builder1


Yeah, but not cheap. We have GPS's at work that get this good, but they cost $3000 a piece and you need two of them (one as a base station) and radio gear so they can talk to each other.

Knossos is right, tell us what you are doing so we can give suggestions, because GPS isn't what you are looking for.
« Last Edit: October 26, 2010, 05:42:47 PM by madsci1016 »

Offline knossos

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Re: Sub-inch Accuracy GPS or Alternatives
« Reply #3 on: October 26, 2010, 05:45:50 PM »
Yeah, but not cheap. We have GPS's at work that get this good, but they cost $3000 a piece and you need two of them (one as a base station) and radio gear so they can talk to each other.

Yeah, but unless I'm mistaken, you are referring to milspec gear which, unless they have opened it up recently isn't available commercially.
"Never regret thy fall,
O Icarus of the fearless flight
For the greatest tragedy of them all
Is never to feel the burning light."
 
Oscar Wilde

Offline madsci1016

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Re: Sub-inch Accuracy GPS or Alternatives
« Reply #4 on: October 26, 2010, 05:54:34 PM »
Yeah, but unless I'm mistaken, you are referring to milspec gear which, unless they have opened it up recently isn't available commercially.


There is milspec, but there's also tech that let's you create your own differential signal. I was referring to RTK (Real Time Kinematic) systems.

Quote
This allows the units to calculate their relative position to millimeters, although their absolute position is accurate only to the same accuracy as the position of the base station. The typical nominal accuracy for these dual-frequency systems is 1 centimetre 2 parts-per-million (ppm) horizontally and 2 centimetres 2 ppm vertically.

Offline knossos

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Re: Sub-inch Accuracy GPS or Alternatives
« Reply #5 on: October 26, 2010, 06:00:05 PM »
Hmm, didn't realize they had gotten RTK that precise.  Never followed it much being stuck in a world of milspec.
"Never regret thy fall,
O Icarus of the fearless flight
For the greatest tragedy of them all
Is never to feel the burning light."
 
Oscar Wilde

 


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