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forum.funcube.org.uk • View topic - XML and JSON interfaces to satellite database

XML and JSON interfaces to satellite database

An area to discuss the design and development of a system to maintain information on satellites and their characteristics

Moderators: pa3weg, g4dpz, admin

XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:11 pm

Hi all,

please find below a starting point for discussing a generic format for applications to ingest satellite information.
We would envisage having a central server (or servers) to serve XML and JSON data to the world about satellites.
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Re: XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:12 pm

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Re: XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:13 pm

Hi Graham,

Yes, we had a small chat about it at the colloquium.
The problem is getting a good schema set up. Dave was looking into this for AmsatDroid already, since he can also distribute KEPS.

@Dave: I suppose we could push the keps into XML and serve them with the satellite?

Getting a good schema set-up is the first thing. Serving it to the world is not the problem. I can also offer the hosting or a mirror / pool of servers.
Lets see how we get on.

We would certainly need to define:
- Sat name
- Sat object no
- State (active / non-active / debris / decayed)
- TLE?
- uplink radio frequencies
- downlink radio frequencies
- beacon frequency
- A way to specify multiple transponders / pairs
- maybe website link for more info (info field, does not need to be http site)

The main problem is to come up with a list of requirements to specify the link (transponder, packet, main downlink, modulation, coding, CW beacon...).

Please add, we can think about the structure and extensions later


Wouter PA3WEG
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Re: XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:15 pm

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Re: XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:16 pm

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Re: XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:17 pm

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Re: XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:17 pm

Hi Mike,

Yes to that and AMEN. The management interface would be the most important thing. Also, I would think something like the OSCAR status page could feed into this XML, but that could be an optional extension that you may or may not choose to show (or even a secondary XML file).

I like QSL contact option.

The trouble I have with the downlink specs is that it can be quite diverse/layered
For instance we would need the following for Delfi-C3 / FUNcube / ISS

Delfi-C3
bitrate 1200
modulation BPSK
coding none
packet format ax.25

FUNcube
bitrate 1200
modulation BPSK
coding AO-40 FEC
packet format FUNcube

ISS
bitrate 1200
modulation AFSK
coding none
packet format ax.25

And may more options may be needed....
But hey, its XML!
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Re: XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:18 pm

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Re: XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:19 pm

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Re: XML and JSON interfaces to satellite database

Postby pa3weg » Tue Nov 18, 2014 3:19 pm

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