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Positioning equipment

Discussion in 'Electronic Equipment' started by Qweertz, Nov 2, 2007.

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  1. Qweertz

    Qweertz Guest

    Hi,

    my teammates and I need to develop some device on one of our collage
    courses. One of it's features is to be able to determine it's position
    relative to it's start position. Distances could be up to 1 kilometer and it
    shouldn't miss more then 10 centimeters. Most important thing about this is
    the price - it should be as small as possible. GPS is too expensive.
    We thought of placing three sticks somewhere in area and then to transmit
    radiowave or ultrasound from our device to them and to measure distance that
    way, but we don't know how much would this cost.
    Does anyone have some better idea or at least knows how expensive would be
    our idea?
    We're new in this area so I appologize if this question seems stupid to
    someone.

    Thanks in advance.
     
  2. -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1
    I highly doubt you will get 10cm in 1Km accuracy with something costing
    less than a $60 GPS module O-o

    - --
    Brendan Gillatt
    brendan {at} brendangillatt {dot} co {dot} uk
    http://www.brendangillatt.co.uk
    PGP Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xBACD7433
    -----BEGIN PGP SIGNATURE-----
    Version: GnuPG v1.4.3 (MingW32)

    iD8DBQFHK3GakA9dCbrNdDMRAll5AKCm+RQOqSYb5ZRpSJrnRiRo4M77uQCgxtR9
    FM1nvDs3DqizJq7s+1vXJqI=
    =ZizA
    -----END PGP SIGNATURE-----
     
  3. JeffM

    JeffM Guest

    They must be making more complex projects down at the Rec Center.
    http://www.google.com/search?q=define:collage
     
  4. poogie

    poogie Guest

    First, I do not think you need three anything. Only two for x and y.
    you need to be more specific in what you are trying to determine. Is
    it a mechanism which runs on the ground and after time you need to
    determine where it is? Do you need to know elevation? The doppler you
    suggest may have some echo problems. What are you allowed to have as
    far as equipment?
     
  5. HapticZ

    HapticZ Guest

    strobe/laser burst, light travel delay measurment?

    FM phase/loran type xmit/rcvr (old stuff!) accrate over time,bad short
    term though
     
  6. Rich Grise

    Rich Grise Guest

    Would this be for electromechanical placement of the appliqués? ;-)

    Good Luck!
    Rich
     
  7. Qweertz

    Qweertz Guest

    Hi,
    Our device will move accross some field and it should cover whole field (it
    should pass over every inch of field). There are no limitations considering
    shape or elevation of field and there can be a lot of obstacles (walls,
    trees etc.). There are no limitations in using any kind of equipment, but it
    should be as cheap as possible.
    I think it would be very difficult to use doppler becouse of the obstacles.
     
  8. poogie

    poogie Guest

    With this information my suggestion would be very inexpensive. I would
    get a computer mouse or better: a track ball mouse and use the guides
    in it to put over say a basketball. Secure the rollers on a bowl
    allowing them to run over the surface of the b'ball. This will provide
    everything you need. A little software calibration on a laptop would
    provide the accuracy. By rolling the ball the cursor would move
    accordingly. You could then load the data into a 3d modeling like
    excel and have a replica of the area covered. I would be cool if you
    used google earth and calibrated it with that. There is also a
    distance tool there. I do not know if it zooms to 10 cm.
    Hope this helps
    Poogie
     
  9. poogie

    poogie Guest

    BTW optical mouse may be better!
     
  10. Qweertz

    Qweertz Guest

    Our device will move accross some field and it should cover whole field
    How come we didn't think of this? :)
    Great idea, thanks! I think we'll use it.
     
  11. Qweertz

    Qweertz Guest

    strobe/laser burst, light travel delay measurment?
    This is something that came first on my mind but it's quite expensive and I
    don't know how good can it work on area of only square kilometer.
     
  12. Wim Lewis

    Wim Lewis Guest

    I'm not sure you'll be able to do better than GPS for an area that large,
    since GPS receivers have gotten fairly cheap --- $60 - $70 including antenna.

    Can you invert the problem? Place a camera on a platform that overlooks
    the whole area. Put a light on each device that blinks at a prearranged
    time. The camera looks for the blink and is calibrated so that you can
    deduce the position of the device from its location in the image.
     
  13. Qweertz

    Qweertz Guest

    my teammates and I need to develop some device on one of our collage
    This could be problematic becouse device would have to move across a lot of
    different fields and it would be too complex for end user to find right spot
    for the camera. If modified trackball won't work, we'll buy GPS.
     
  14. Qweertz

    Qweertz Guest

    Our device will move accross some field and it should cover whole field
    I doubt optical mouse would be good becouse it doesn't work well in 3D.
    However, trackball might solve the problem.
     
  15. hr(bob)

    hr(bob) Guest

    What about a laser distance finder like surveyors use?

    Bob Hofmann
     
  16. CWatters

    CWatters Guest

    I suspect it will slip.
     
  17. CWatters

    CWatters Guest

    More expensive than GPS ?
     
  18. Qweertz

    Qweertz Guest

    Our device will move accross some field and it should cover whole
    + it doesn't work well when there are some obstacles.
     
  19. Qweertz

    Qweertz Guest

    Indeed.
    I'm not so enthusiastic any more :)
     
  20. terryS

    terryS Guest

    This is a technical subject! No need to be able to spell!
    That will come later when it is necessary to make presentations to
    management groups and investors?
     
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