Re: Private baby GPS

Giorgis <giorgis.3erolas@xxxxxxxxx> 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.

[snipped interesting application]

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 ...

What type of accuracy can be expected with ultrasonic ?

It's all about speed and timing accuracy. Since sound travels about a
million times slower then radio waves, you can expect a much higher
precision with (ultrasone) audio then with radio.

A basic (and maybe naive) setup could be to combine RF and audio: your
device-to-track transmits an audio and RF burst at the same time, a few
times per second. These signals are picked up by 3 microphones and a
radio receiver in the field. Calculating the time between the incoming
RF and audio signals should give you enough information for making a 2D
fix of the position.


--
:wq
^X^Cy^K^X^C^C^C^C
.

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