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GPS Module - Accuracy vs. Resolution — Parallax Forums

GPS Module - Accuracy vs. Resolution

TWilsonTWilson Posts: 8
edited 2009-09-20 15:22 in Accessories
All,
Just want some clarification on the GPS module sold from Parallax:
The manual mentions accuracy (0.1 meters) as part of the specs, but is accuracy and resolution really the same? What is the best you can get out of this module?
Thanks,
TWilson

Comments

  • FranklinFranklin Posts: 4,747
    edited 2009-09-17 23:20
    Where do you find that spec? The module itself has a stated accuracy of 2m for one model and 5m for the other in its datasheet linked to on the parallax page.

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    - Stephen

    Post Edited (Franklin) : 9/17/2009 11:25:45 PM GMT
  • CounterRotatingPropsCounterRotatingProps Posts: 1,132
    edited 2009-09-17 23:25
    Hi TWilson,

    Welcome to the forums.

    This is not a simple question to answer.

    a quick search on google under

    accuracy of GPS

    will show why.

    The best I've gotten is about to within 6 feet. (Probably due to the GPS signals themselves.) But you have to be moving for this thing to output a new value. Overall accuracy increases the more sample data points you track. Take a look at one of Chris's (Parallax) projects that might be of assistance:

    "GPS Datalogger using google earth"
    http://forums.parallax.com/forums/default.aspx?f=21&m=379992

    Cheers
    - Howard

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  • CounterRotatingPropsCounterRotatingProps Posts: 1,132
    edited 2009-09-17 23:26
    Stephen,

    I wonder if it's a typo - doesn't seem possible, does it?

    - H

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  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2009-09-18 04:00
    Remember, GPS accuracy and resolution are affected by environmental conditions as well. Especially on units with a patch antenna. Take care.

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    Chris Savage

    Parallax Engineering
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  • Guns of FunGuns of Fun Posts: 26
    edited 2009-09-20 15:22
    Accuracy is how close to the true value the instrument can get you.

    Resolution is how detailed the output of the instrument can display.

    Take a DMM that is trying to measure 12VDC.

    How accurately can the DMM measure 12VDC?

    Once measured, how detailed is the resolution? e.i· 11.9V versus 11.9999V

    The next step is repeatability.· If you measure the same output numerous times, how close are the measurements to each other?

    Thats my take on it anyway.
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