🚀 go-pugleaf

On Mar 21, 5:49 pm, "David L. Jones" <altz...@gmail.com> wrote:
> On Mar 21, 2:56 pm, "Josh916" <jka...@gmail.com> wrote:
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> > On Mar 21, 3:33 pm, Donald <Don...@dontdoithere.com> wrote:
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> > > Josh916 wrote:
> > > > The project is to locate a r/c boat in a roughly 2 to 3m^2 water
> > > > filled box, hence the transmitters or recievers will only be on the 3
> > > > or 4 walls of the box.
>
> > > > It will need to be fairly accurate considering the size of the box
> > > > relative to the size of the boat (i.e down to cm's).
>
> > > > We are also considering placing a webcam above the box and using image
> > > > processing to locate the boat, however I thought we might get more
> > > > accurate results using RSSI.
>
> > > > I hope that helps.
>
> > > > Josh
>
> > > > On Mar 21, 2:44 am, chuck <nos...@nospam.org> wrote:
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> > > >>Josh916 wrote:
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> > > >>>I would like to use RSSI to locate an object in a 3D space. The space
> > > >>>will be a square box with transmitters located on the 4 corners. An
> > > >>>object will be place at certain positions within the box and I want to
> > > >>>be able to determine its location inside the box. Much like an
> > > >>>internal GPS.
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> > > >>>I would like to know what components (IC's?) I need to perform such a
> > > >>>task.
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> > > >>>Or if anyone else has any other more effective methods to acheive such
> > > >>>a task your comments are welcomed.
>
> > > >>>Thanks,
>
> > > >>>Josh
>
> > > >>GPS doesn't use RSSI, of course.
>
> > > >>Is the task you want to perform the use of RSSI, or the determination of
> > > >>position location with a box? What kind of accuracy do you hope to achieve?
>
> > > >>Have you considered ultrasonic distance measurement?
>
> > > >>Chuck
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> > > >>----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==----http://www.newsfeeds.comThe#1NewsgroupService in the World! 120,000+ Newsgroups
> > > >>----= East and West-Coast Server Farms - Total Privacy via Encryption =----- Hide quoted text -
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> > > >>- Show quoted text -
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> > > Josh,
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> > > Your idea has been tried by big governments with big budgets.
>
> > > NO, it will not work.
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> > > If you care to read a little, you may find a not so cheap way of doing
> > > what you want:http://en.wikipedia.org/wiki/Pseudolite
>
> > > google has lots of links:http://www.google.com/search?hl=en&c2coff=1&sa=X&oi=spell&resnum=0&ct...
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> > > good luck
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> > > If you find a way of getting this done, in any home made way,
> > > please let us know.
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> > > donald- Hide quoted text -
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> > > - Show quoted text -
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> > Thanks for everyones help, RSSI was mentioned to me by a fellow
> > academic and I'm at the stage of researching its possiblilites.
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> > He seems to think that it is possible.
>
> Josh, he is wrong.
> It can be done (sort of) on a larger scale, but at the small scale you
> are talking about it's just not possible as other posters have
> mentioned. You would be lucky to determine if the object is inside the
> box or outside, let alone its position inside.
>
> > I will keep looking into it as I also have a backup plan using the
> > webcam.
>
> Seriously, start your backup plan now. Then it just becomes
> essentially a software project.
>
> Dave.- Hide quoted text -
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> - Show quoted text -

Having done some more research today it looks like other posibilities
include acoustic positioning or infrared positioning (e.g.
http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2004/rd73/476finalpro.htm)

What does everyone think about the other technologies mentioned above?