[aprssig] Fwd: Cleaning up the Global APRS Satellite ground station network?- New Symbol

Andrew Rich vk4tec at internode.on.net
Mon Aug 7 21:07:26 CDT 2017


Separate APRS-IS for space packets ?

 

A

 

From: aprssig [mailto:aprssig-bounces at tapr.org] On Behalf Of Robert Bruninga
Sent: Tuesday, 8 August 2017 5:13 AM
To: TAPR APRS Mailing List <aprssig at tapr.org>
Subject: [aprssig] Fwd: Cleaning up the Global APRS Satellite ground station network?- New Symbol

 

APRS Authors,

 

Back in 2008 we proposed depricating about a dozen of the original Weather symbols and moving them to specific OVERLAYS such as the 8 different forma of Participation shold have only ONE precipitation symbol and then define the others as Overlays:

 

This is all detailed at the bottom of this web page since 2008:

http://aprs.org/symbols/symbols-new.txt

 

HAVE authors followed this?  Are those dozen original alternate symbols now fully depricated so we can move on to use some of the new available symbl space.  FOr example, I want a BASE symbol for APRS Satellite Netowkr and then the overlays can describe the variety of ground stations feeing the APRS-IS.

 

In particlar, has Lightening moved from the \J symbol to the new LI symbol?

 

If we bgine using #J overlays for APRS-IS satelite ground stations, what conflicts will arise?

 

With now cubesats going up 100 at a time per launch. there is a pwoer ful future use of this symbol.

 

Here is the full proposal I sent to AMSAT-bb, though the exact symbol base is still TBD...

 

Bob

 

---------- Forwarded message ----------
From: Robert Bruninga <bruninga at usna.edu <mailto:bruninga at usna.edu> >
Date: Mon, Aug 7, 2017 at 2:11 PM
Subject: Cleaning up the Global APRS Satellite ground station network?
To: amsat bb <amsat-bb at amsat.org <mailto:amsat-bb at amsat.org> >
Cc: Robert Bruninga <bruninga at usna.edu <mailto:bruninga at usna.edu> >



I think we should better organize our autmoatied automatic APRS satelite  ground stations. We found about 330 unique IGATES feeding the APRS-IS and the two APRS satellite networks:

http://pcsat.findu.com  and http://ariss.net

 

For decades a hot topic at SmalSat conferences has been remote ground station networks.  Some costing $100,000 or more but with only a half dozen other stations that seem to always be just one more software, and one more receiver upgrade to actualy be operating.

 

Meantime, APRS has had global ground stations by the hundreds. They all work fine for APRS donwlinks on 145.825.

 

I am not really interested (for now) in diluting this always-listening network by spinnning off stations that can be remotely tuned to go listend to the other hundreds of small sats and their UHF downlinks which require tracking AND Doppler tuning,  For now, I'd rather encourage more AMSATS to  use our network and provide more APRS transponders!

 

In addition, I'd like to at least see about making this ground station netwrok to be TWO_WAY just like APRS was designed, so that small satellite control operators with satellites on 145.825 can send APRS message back to their spacecraft for control anywhere anytime. The inherent protocol does this already (once a fground station has heard the satelite at least once on that pass).

 

I do think this transmit path might need to be available only to valid control operators, though,,,

 

Remember, with this many stations I have not encouraged AZ/EL active trackign but just omni receivers.  After seeign all the problems when Yaesu rotators are run full time, I do not think that is a strong idea for hams at home...  But maybe universities who have budgets to replace warn out equipment?

 

So here are just some initial thoughts about this network we already have:

 

PHASE 1:

 

Lets choose a unique set of APRS symbols to clearly identify this network.  In 2008 we expanded the APRS symbol set.  FOr example the \& gateway symbol has plenty of vacancies we can use for this purpose.  Here are the existing Gateway overlays:

 

/& = HF Gateway  <= the original primary table definition
I& = Igate Generic (please use more specific overlay)
R& = Receive only IGate (do not send msgs back to RF)
P& = PSKmail node
T& = TX igate with path set to 1 hop only)
W& = WIRES-X as opposed to W0 for WiresII
2& = TX igate with path set to 2 hops (not generally good idea)

 

We could; define additional overlays for this Satellite ground station network:

 

A& for Omni "AMSAT" ground station (2-way, 50W radio)

L& for Omni "AMSAT" low power or other wise less than optimum sky view

O& for Omni receive Only

H& for HFSAT (that will be our next one in a few years)

Y& for Yaggi oscar class (Gernerallyh tracks APRS sats of current interest)

U& for UHF downlinks chanel (TBD)

S& for Schools and University class (always on and can track on demand?) and can QSY when we figure out how we want to do this... (and can afford to wear out their stuff)

 

V& for Various?  Since APRS has a FREUENCY SPEC already, we can assume that all stations using these symbols are on 145.825, UNLESS they include a different frequency in their STATUS text.  A V station might be VARIOUS and that indicates that it is auto tracking and auto tuning any satellite in view and is beaconing that frequency in its status each time it changes frequency.

 

 

THen lets come up with some well defined way to categorize capablities so that it all fits in the station's STATUS packet in a consistent way.

 

I know there are LOTS of ideas of all kinds of automated linked ground stations.  I am not trying to disrupt all those ideas, but simple clean up what I think is what APRS already has?

 

Does this seem like a plan?

 

Bob, WB4apr 

 

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