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I thought about making the indoor tracker able to simply collect any
position from a tracker and modify it, then transmit to RF, but 1)I
don't like digipeaters to modify the data portion of a packet, 2)it
won't work with the current crop of tiny trackers. 3)What are the
chances of a tracker being pointed at an IR digipeater at the moment it
wants to transmit? I figured it was better to get the IRGPS to
transmit a fake $GPRMC continually, updating the time once a second.
That way the bulk of the power (ie illuminating a LED) is done by the
thing that is most closely tied to the building's power or able to have
a larger battery. Users don't want to carry a larger battery. It
would be neat though to have tiny tracks(or open trackers) that could
transmit simply the callsign over IR every second, and do normal "rf"
output as programmed currently.<br>
<br>
RF might be interesting if we could get a cheap enough receiver to do
what IR will do. Blue tooth might be interesting for this if there is
a module that can output the fake GPRMC sentences to the tiny trak.<br>
<br>
Wes<br>
<br>
<a class="moz-txt-link-abbreviated" href="mailto:scott@opentrac.org">scott@opentrac.org</a> wrote:
<blockquote cite="midE1DcsEu-0002Mc-3m@home.miller.org" type="cite">
<pre wrap="">Ick. I don't like IR. I'd rather see it use 802.15.4 or RFID. And if
you're doing that you might as well put the smarts in the fixed station and
have it do the reporting itself.
Scott
N1VG
</pre>
<blockquote type="cite">
<pre wrap="">-----Original Message-----
From: <a class="moz-txt-link-abbreviated" href="mailto:aprssig-bounces@lists.tapr.org">aprssig-bounces@lists.tapr.org</a>
[<a class="moz-txt-link-freetext" href="mailto:aprssig-bounces@lists.tapr.org">mailto:aprssig-bounces@lists.tapr.org</a>] On Behalf Of Wes Johnston
Sent: Monday, May 30, 2005 2:35 PM
To: TAPR APRS Mailing List
Subject: [aprssig] indoor tracking.
Was thinking while I was travelling today and had an idea.
Follow me on this....
I gave a lot of thought to repeating GPS signals indoors.
This was disussed last week, and the solution would involve
getting a coax thru the roof at dayton for example. Even
then, everyone would read the same position as the out side
antenna. So, why not program a fake GPS transmitter that
would transmit a NMEA string that contained that position?
Do it in such a way that any aprs tracker in proximity would hear.
What if we were to build a IR transmitter that had a real
time clock in it, and each second transmitted a NMEA sentance
with a preprogrammed location and the correct UTC time? Such
a unit could be placed in the entrances to the halls in
dayton and programmed to the location of the entryway. By
maintaining the approximate correct time, any tiny tracks
programmed for slotted beacons would still operate properly.
</pre>
</blockquote>
<pre wrap=""><!---->
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</pre>
</blockquote>
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