Re: Private baby GPS

What type of accuracy can be expected with ultrasonic ?

A lot better than half a meter should be doable. At 300 m/S, 0.5m
means 1.67 mS delay which you can measure using just about
anything :-). Measuring 1/10 that may take more than "anything",
but it will take me more than just an estimate to be able to say
whether it will be significantly costlier than the "anything" :-).

Dimiter

------------------------------------------------------
Dimiter Popoff Transgalactic Instruments

http://www.tgi-sci.com
------------------------------------------------------

Giorgis wrote:
Didi wrote:
Giorgis wrote:
I would like to be able to setup a private GPS like settup.
Lets say I have a garden. I would like to setup 4-5 transmitters on a
post at it's corners.

Then I would like to have a box that would indicate it's position with
relative high accuracy
with respect to the transmitters.

Any ideas ?

Regards
Giorgis

RF based devices will cover a larger area at a not so high accuracy.
If the garden is not that large - or at the cost of more receiver
stations - you can use a modulated ultrasonic transmitter to attach
to the naughty kid and detect its position very precisely (at least
until the kid does not get naughty enough to get rid of the tag... :-)

Dimiter


Hmmm ... intersting application ;-) I'd like to be able to use it
indoors.
I am hoping to get half meter accuracy or better. The hints are a start
...

Any other takers ? :-)

What type of accuracy can be expected with ultrasonic ?

Regards
G

.

Relevant Pages

  • Re: Private baby GPS
    ... with respect to the transmitters. ... RF based devices will cover a larger area at a not so high accuracy. ... stations - you can use a modulated ultrasonic transmitter to attach ... to the naughty kid and detect its position very precisely (at least ...
    (comp.arch.embedded)
  • Re: Private baby GPS
    ... I would like to setup 4-5 transmitters on a ... with respect to the transmitters. ... RF based devices will cover a larger area at a not so high accuracy. ... to the naughty kid and detect its position very precisely (at least ...
    (comp.arch.embedded)
  • Re: Homebrew breadboard xmtr
    ... early transmitters always doubled or tripled from stage to stage. ... Further research would have shown 160 meter crystals were frequently ... dawned on me a little bit slowly is that none of those old xmtrs were ... xtals abounding so I went the route of reinventing the wheel so to speak. ...
    (rec.radio.amateur.homebrew)
  • Re: Private baby GPS
    ... with respect to the transmitters. ... RF based devices will cover a larger area at a not so high accuracy. ... However, using ultrasonic ranging over some tens of meters, you would ... have to cope with ranging errors due to wind velocity. ...
    (comp.arch.embedded)
  • Re: Lectro 400 Series - Hiss and No Db Response?
    ... the 201 meter is peak and the 401 meter is VU. ... series transmitters and your mics are wired for 200 series ... Gotham and ask what your options are for a mic swap or re-wire. ...
    (rec.arts.movies.production.sound)