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What has peoples experience been with the Parallax GPS Receiver Module? — Parallax Forums

What has peoples experience been with the Parallax GPS Receiver Module?

patterson7019patterson7019 Posts: 25
edited 2008-07-15 09:01 in BASIC Stamp
I'm looking for a good option for how my robot will know what room and where in the room (ruffly) my robot is. I'm not sure the GPS module will work well enough.

How many feet ruffly it is it accurate, outside?

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http://perfectaperture.com/robb

Comments

  • allanlane5allanlane5 Posts: 3,815
    edited 2008-07-14 16:43
    I thought GPS was accurate to about 10 feet, that's if you're OUTSIDE and the reciever can "see" a satellite.

    That's not going to help navigate a room, though.
  • MikeKMikeK Posts: 118
    edited 2008-07-15 00:39
    "A" satellite? You need multiple satellites. I have a Parallax GPS. Outside, if I stand near my front door, the reading puts me somewhere on my front lawn or driveway (according to Google maps), 15'-20' away, sometimes more.

    Mike
  • patterson7019patterson7019 Posts: 25
    edited 2008-07-15 05:33
    Hmm. Okay I will need something else then for inside navigation for sure. Thanks for the feedback!

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  • MorrolanMorrolan Posts: 98
    edited 2008-07-15 09:01
    GPS is said to be accurate upto 16 feet / 1 metre with the current technology, until the European Galileo system fires up which will ultimately be aiming for a resolution of 3 feet / 1 metre. I do not know what figures the Parallax GPS receiver quotes, but I can get a signal on my office windowsill and it places me somewhere between the office building and the wall 20 feet away usually.

    However, as soon as I move more than a foot from my window I lose the signal, so don't get your hopes up for internal navigation.

    I would say that your best bet will be a mixture of technology - the Parallax compass module working alongside a PING))) sensor and maybe some Sharp infrared sensors.

    Maybe even a SODAR/RADAR like scanning ability coupled with the compass to plot out each room and then try and retrace it's steps like on this Penguin:
    http://forums.parallax.com/showthread.php?p=683124

    Unfortunately, accurate plotting of a location inside a room isn't possible without actively scanning the room itself, as even if Galileo could see inside a building, 3 feet is the difference between the bathroom and a tumble down the stairs...

    .

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