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SV: [aprssig] Another kind of SmartBeaconing?

Rikard Sohlberg rikard.sohlberg at home.se
Sat Aug 25 21:43:08 UTC 2007


OK, no, as the trackers are merely an add-on, they do not need any
certification. The official racing timing is done via the IGC (The Gliding
arm of FAI) approved loggers. We are currently using the PocketTracker and
the new MicroTrak 300. And they work just fine!
Check out todays flight!

http://aprs.he.fi/?call=SEUNA&mt=m&z=9&timerange=21600

Or via your favourite site. 133 km today in difficult wind.  
I use tactical callsign SEUNA (my gliders registration is SE-UNA) and our
club signal in the status message.

My guess is that many applications would benefit from a geofence/box-type
switching option. Please consider it!

73 de Rikard/SM0JWX

Me and my glider: http://www.pilotmagazinet.se/search.asp?search=SE-UNA

 
 

-----Ursprungligt meddelande-----
Från: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
För Scott Miller
Skickat: den 21 augusti 2007 23:01
Till: TAPR APRS Mailing List
Ämne: Re: [aprssig] Another kind of SmartBeaconing?

I considered adding some geofencing-based profile switching options to 
the OpenTracker, but so far I haven't gotten around to it.  I can 
probably manage it on the Tracker2.  It'd most likely take the form of a 
series of conditions (inside box, outside box, etc) that'd trigger 
configuration commands (e.g, INTERVAL 10).

The trackers don't need to be certified by the FAI, do they?  I know 
they have some requirements for loggers.  The hardware that ran the 
first OpenTracker (and its NMEA parsing code) were originally built as 
part of a paraglider datalogger project.

Scott
N1VG

Rikard Sohlberg wrote:
> I would like to throw out a question.
> 
> I use APRS for tracking gliders (sailplanes). From humble beginnings 
> here in Sweden, it has grown into a big success, almost turning a niche 
> sport/event into a spectator sport. Watching a sport where the track is 
> anywhere from 150 to 500 km (when will you boys go metric
 ;.) used to 
> be a problem. Now we have some 25 trackers active in Swedish gliders, 
> and everybody loves it. And, yes, it is perfectly legal, even when there 
> is no ham onboard. Of course I can’t speak for all jurisdictions, but at 
> least in Sweden, we are OK.
> 
>  
> 
> Now to my problem or question. We have tried SmartBeaconing and fixed 
> interval beacons. Neither one serves a glider particularly well. A 
> glider (when it leaves to vicinity of the airfield), typically circles 
> in a thermal to gain altitude and then flies in a straight line to get 
> around the track. Tests of SmartBeaconing has shown that it is not well 
> suited to this kind of motion. In fact, it gives the exact opposite of 
> what we want, se below. Also, to have an exact fix when the glider is 
> 200 km away is not needed. What is needed, though is fast updating at 
> the end of the track. Incredible as it may seem, many competitions end 
> up with the gliders chasing each other within a few meters (ehh
 feet 
> any one
;-) apart in the race to the finish line. And that is often the 
> case after flying a track of, say 300 km and 3-4 hours. Speeds are 
> typically up to 250 km/h (mph..?) at the race for the finish line.
> 
>  
> 
> So after this wordy preamble
 What I see needed is some kind of 
> Geofence/box-type beaconing.
> 
> The algorithm being something like:
> 
>  
> 
> If (tracker.lat<N60.5 and tracker.lat >59.8 and tracker.long<E16.5 and 
> tracker.long>15.9) then beacon every 10 secs
> 
> If (tracker.distance-to-goal-line < 5 km) beacon every 2 secs
> 
>  Else
> 
> Beacon every 3 minutes
> 
>  
> 
> I’m not a programmer (any more), but you are clever guys, you get my 
> idea. When inside the box (including the starting gate and finish line) 
> beacon often, outside the box fall back to once every 3 min or so not to 
> clutter up the QRG.
> 
>  
> 
> Does anyone know of some tracker code/application for this?
> 
>  
> 
> Of course, what would also be handy would be a Glider specific mode:
> 
>  
> 
> If(course .changes. more than 15 seconds) stop beaconing    ./ When 
> entering a thermal and starting to circle /.
> 
> When (course .eq. last.course(15 sec))) beacon                    ./ 
> When leaving the thermal and flying in a straight line  /.
> 
>  
> 
> Any one out there doing something like this?
> 
>  
> 
> Thanks for any thoughts and ideas.
> 
>  
> 
> 73 de SM0JWX/Rikard
> 
>  
> 
> (Go metric before Burma, please
)
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> ------------------------------------------------------------------------
> 
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