🚀 go-pugleaf

On Mar 21, 8:46 pm, "David L. Jones" <altz...@gmail.com> wrote:
> On Mar 21, 5:31 pm, "Josh916" <jka...@gmail.com> wrote:
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> > On Mar 21, 5:49 pm, "David L. Jones" <altz...@gmail.com> wrote:
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> > > 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.
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> > > > > > 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).
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> > > > > > 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.
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> > > > > > I hope that helps.
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> > > > > > Josh
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> > > > > > 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.
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> > > > > >>>Thanks,
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> > > > > >>>Josh
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> > > > > >>GPS doesn't use RSSI, of course.
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> > > > > >>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?
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> > > > > >>Have you considered ultrasonic distance measurement?
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> > > > > >>Chuck
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> > > > > >>----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==----http://www.newsfeeds.comThe#1NewsgroupServiceinthe 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.
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> > > > > 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
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> > > > > 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.
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> > > 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.
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> > > > I will keep looking into it as I also have a backup plan using the
> > > > webcam.
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> > > Seriously, start your backup plan now. Then it just becomes
> > > essentially a software project.
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> > > Dave.- Hide quoted text -
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> > > - Show quoted text -
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> > 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/rd...)
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> > What does everyone think about the other technologies mentioned above?
>
> You are wasting your time, visual object recognition is the best
> method in this particular instance. All the other methods (RSSI,
> acoustic, and IR) require a transmitter on the boat and multiple
> receivers. Visual recognition on the other hand doesn't require any
> transmitter, will work with almost any size or type of object, is
> simple, fairly accurate, will most likely only require one receiver,
> and reduces the problem to essentially a software solution.
>
> The decision is blindingly obvious.
>
> Dave.- Hide quoted text -
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> - Show quoted text -

Thanks for everyones help, especially David Jones, I will be going
with the visual recognition. It was originally my first choice though,
as you do, I wanted to exhaust all possible options before finalising
the decision as you never know there might of been an easier, more
efficient way.

Josh