🚀 go-pugleaf

"Rich Grise" <rich@example.net> wrote in message 
news:pan.2007.03.21.22.55.17.903470@example.net...
> On Wed, 21 Mar 2007 20:08:20 +0100, martin griffith wrote:
>> On Wed, 21 Mar 2007 17:22:27 GMT, in sci.electronics.design Rich Grise
>>>On Mon, 19 Mar 2007 17:03:09 -0700, Josh916 wrote:
>>>
>>>> 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.
>>>>
>>>>
>>>What's "RSSI"?  Repetitive Stress Syndrome Imaging? ;-)
>>>
>> received signal strength indicator
>>
>
> Oh, gosh. Than that's definitely a non-starter. I'd at least try
> ultrasonics, or maybe lidar and triangulate. But, as has been said,
> just imaging from the top is probably the best, since compute power
> is cheap these days, and Josh916 seems to have total control over the
> environment.
>
> Of course, if you're out on the lake, it'd probably be pretty expensive
> to hire a blimp for the camera. ;-)
>
> Thanks!
> Rich
>
I think if he can equip the box with a wire grid and have a receiver on the 
boat, then each wire of the grid could have a different tone signal on it. 
The antenna on the boat receiver would pickup the tones so the 2 strongest 
tones would indicate the position of the boat. He could simply program a pic 
micro to sample the tones and output the x,y coordinate via a radio signal 
from the boat. This would be an example of RSSI.
This same setup may well work with the robot soccer games.  Jus my 2 cents 
worth :)  JTT