Two nearly identical 1U CubeSats are waiting to be deployed from the ISS:
SiriusSat-1 call sign RS13S frequency 435,570 MHz.
SiriusSat-2 call sign RS14S frequency 435,670 MHz.
The modulation is GMSK 4800, AX.25 G3RUH protocol.
Our best info about the deployment time at the moment:
The start of EVA 2018-08-15T15:58Z.
SiriusSats deployment from T+00:10:00 to T+00:18:00.
CubeSats will start to transmit in 15 mins after RBF is removed.
So our best guess now is they will start beaconing about 2018-08-15T16:23Z every 30 secs.
We’ll post updates on date/time/delays in case of new info.
It’ll be great to get temporary NORAD ids. We are planning to observe first crucial hours/days with help of network.satnogs.org and db.satnogs.org. Software for telemetry decoding/forwarding and more info on the way.
One more question: As far as we know there is no decoding in 4800 G3RUH mode right now. Would it be hard to add such support? We are ready to write the code and test it. Which way it better be done? Should it be a separate entity like satnogs_fsk9600_g3ruh_ax25 or more generic solution?
Thanks in advance.
– SPUTNIX team | http://sputnix.ru | R2ANF
– Educational Center “Sirius”
– Skobeltsyn Institute of Nuclear Physics(SINP MSU)
Good luck with your deployment! Currently, there is no GMSK 4800, but your case is a good opportunity to add a series of more generic AX 25 flowgraphs. I will start asap. Meanwhile, do you have any signal recording from your birds to start play with?
Thanks for the info! We are glad to help observing these CubeSats.
I’ve just added SiriusSat-1 and SiriusSat-2 in db and their transmitters. I gave them temporary norad ids, 99970 and 99971.
They will be visible in network in the next hours, however scheduling will not be available until we manually add TLEs (some hours before their deployment). The first TLEs will be the ones of ISS and they will be updated as soon as we have newer ones. After norad id assignment, their TLE will be automatically updated.
Let me know if you have any questions or if you need any help.
Thanks for quick responses. We have uploaded test signal recordings and telemetry decoding software for Windows to our website: http://sputnix.ru/en/satellites-en/siriussat-2-en. We are working on Linux version and more updates. Please let us know if app crashes or any bugs/suggestions or recordings not good.
BTW, what is relations between demoded/decoded telemetry from network.satnogs.org and submitted through SiDS to db.satnogs.org? Does all telemetry from network go to the db with source == ‘network’ and availiable for download in CSV from db.satnogs.org? Is it possible to relate telemetry received by our network station to our other station(R2ANF-KO85qq at https://db.satnogs.org/stats/) which submits to db through SiDS?
Not yet. There is a disconnect between telemetry decoded in network.satnogs.org and telemetry decoded in db.satnogs.org. We are working on a pipeline which will move data from network to db, but for now you may have success finding data in both sources.
Is your telemetry frame data format available somewhere?
Current versions of linked software show bit offsets of all fields in GUI or you can dig straight into resources/devices/*.xml. There is also 8-byte header after AX.25 header, offsets in GUI and *.xml are from the end of that extra header. Only beacon descriptions translated to English ATM. We don’t provide more descriptions of data formats right now, but we can help and answer questions. If you are thinking about parsing telemetry for web interface it’s probably an overkill in case satellites fail.
Thanks for clarifications about network/db matter.
Linux version of telemetry decoding software is available on our site now. http://sputnix.ru/en/satellites-en/siriussat-2-en. If there are any bugs or crashes we will try to fix it. Any questions or contact reports are welcome to email siriussat ta sputnix.
If you know people who can help us observing first days please share info with them. Both network.satnogs people and all others are welcome.
There is some info that satellites could be deployed some minutes later. Which can make the first North America pass silent. But it’s better to start early than later. Watch live, good luck with reception! We believe in you!
We’ve tried the second TLE set 2020-12-02. It was better than AMSAT/CelesTrak/SpaceTrack/NORAD. Thanks a lot! Then TLEs got updated again, and now they are old again. We hope to get new TLEs for tomorrow 2020-12-05 Moscow passes. Any help much appreciated!
There are a lot of experiments going on with sats these days, hope you all understand. We are swamped with upcoming launches to be honest, but we hope to get back in touch with SatNOGS, IARU and all RF/amateur/sat community soon!