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How accurate is the Parallax GPS module? — Parallax Forums

How accurate is the Parallax GPS module?

boeboyboeboy Posts: 301
edited 2007-06-28 19:46 in General Discussion
How accurate is the Parallax GPS module in feet I can not seem to find it in the data sheet.

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My computer, http://forums.parallax.com/showthread.php?p=630466

Comments

  • phil kennyphil kenny Posts: 233
    edited 2007-06-22 20:40
    If you look on page 4 of this pdf file

    http://www.parallax.com/dl/docs/prod/acc/GPSManualV1.1.pdf

    you will see the accuracy listed as +/- 5 meters on the average.

    However, this can vary quite a bit, depending on whether or not
    you are indoors or what might be blocking the signals from the
    GPS satellites in reaching your antenna.

    phil
  • boeboyboeboy Posts: 301
    edited 2007-06-22 22:41
    Thank you I do not know how I did not see that.

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    My computer, http://forums.parallax.com/showthread.php?p=630466
  • <my_name_here><my_name_here> Posts: 2
    edited 2007-06-28 16:43
    Confused here.· Does that mean that all points are up to 5 meters off, or will it appear to my bot that it is jumping around by 5 meters between recieving data???
  • Paul BakerPaul Baker Posts: 6,351
    edited 2007-06-28 17:14
    That is the drift over time due primarily to atmoshperic conditions, so unless your bot is in a tornado or perhaps a huriccane, the readings will not fluctuation severely between different readings.

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    Paul Baker
    Propeller Applications Engineer

    Parallax, Inc.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-06-28 17:25
    All GPS systems have an inherent accuracy issue affected by a number of factors. Number of Sats, Weather/Humidity conditions, metal framework or building around the GPS. It doesn’t just become, say 5 meters off and that is consistent for all readings. You can have a variance of that much on any given reading. Also remember that when you plot the coordinates to something like Google that the mapping grid they use may be off for the readings you get. GPS systems with maps often correct for this.

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    Chris Savage
    Parallax Tech Support
  • steve_bsteve_b Posts: 1,563
    edited 2007-06-28 18:23
    Something cool that some of our scientists do, is use GPS signals to determine precip rates/amounts using the attentuation/phase change of the signal.

    This has been a Cliff Claven moment!

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    ·

    Steve

    "Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2007-06-28 19:46
    Here is a decent explanation with video of how GPS works...Asa side note this site is a great learning tool!

    http://electronics.howstuffworks.com/gps.htm

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    Chris Savage
    Parallax Tech Support
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