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[aprssig] Tracker Smart Pathing

Jason Rausch jason at ke4nyv.com
Tue Mar 21 16:36:35 UTC 2006


The whole point is to beacon when needed.  Such as
going around corners and curves, crucial points.  How
about sitting still for hours on end?  You're 1 or 2
minute beacon rate will just keep going the whole time
at that rate.  For what??  You're not going anywhere! 
When a vehical is sitting still employing
SpartBeaconing, it automatically drops down to the
slow_rate (typically 30-45 minutes per beacon).  Once
the vehical starts moving again, the beacon rate will
pick back up based on speed and goes right back into
beaconing at crucial points.

The algorithm IS intended to decrease un-needed
beacons.

Do you honestly beleive that we would intentionally
introduce a new method that would actually increase
traffic?  And even if that was so, why the hell would
so many other people adopt such a rediculous idea
then?

Jason KE4NYV
www.ke4nyv.com
RPC Electronics
www.rpc-electronics.com

--- "Daron J. Wilson" <daron at wilson.org> wrote:

> 
> > Now, this is a statement I need to check on. 
> Round these parts I have
> > *NEVER* seen "SmartBeaconing" do anything but
> produce *more* packets than
> > any sane fixed beacon rate station.
> 
> I don't believe the goal of smart beaconing has ever
> been to 'produce less
> packets', however, it does produce more timely
> packets.  In a given stretch
> of road, if I set my fixed rate to 5 minutes and
> drive for an hour, it is
> quite likely that my smartbeaconing will produce
> more packets...unless, that
> is a straight shot down the highway.  However, with
> the fixed rate, if I
> beacon, then turn and go perpendicular to my
> original path, I'm 5 miles away
> from my previous course before anyone knows my
> position.  Conversely, they
> know the moment I make the turn with smart
> beaconing.
> 
> Perhaps it depends on what you expect for position
> report accuracy and
> update.
> 
> > 
> > We have a few stations in the area that are
> running TinyTrakIIs with smart
> > beaconing turned on.  When they're operating, I
> routinely see 3-5 packets
> > per minute from them if they're on any kind of
> windy road --- that is,
> > most
> > of the ones outside the city.  I think this is due
> to the corner-pegging
> > feature -- great for producing a detailed map of
> the road up to Sandia
> > Crest (where a prominent local digi lives), but
> not very channel-friendly.
> > Sometimes I've even seen that level of output from
> them even when they're
> > on
> > freeways.
> 
> There must be a sliding scale between channel usage
> and accuracy of
> position.  We don't all transmit every 30 seconds
> (too much channel usage)
> nor do we knock it back to once every hour (not much
> accuracy).   Rather, we
> find that happy medium with recent enough refresh
> rate to meet our
> positioning needs.
> 
> Smart beaconing means that you won't find my vehicle
> sitting at starbucks
> for an hour beaconing every 2 minutes :)  It also
> means that when I'm on the
> move, you have a very good idea of where I am, not
> where I was 5 minutes
> ago.
> 
> In our terrain, when I get to a curvy mountainous
> road, I beacon quite more
> frequently than a straight road, however, due to the
> canyons and hills the
> coverage is reduced, I don't get into a digi on
> every packet, so it seems to
> even itself out a bit.
> 
> Daron, N7HQR
> www.ocrg.org
> 
> 
> 
> 
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