Many thanks for the TLEs. They help a lot for the Genesis comisioning efforts. Congratulation to QUBIK and Fossasat teams for the success.
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Downlinks from QUBIK 3 & 4 easily visible but a full 3 minutes ahead of 2022-122D on the 0510utc pass over the U.S. So, I assume we’re missing some object TLEs or the existing TLEs need adjustment. Time will tell.
Tweet w/ pictures → https://twitter.com/scott23192/status/1576825649045549056
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Quick update on QUBIK 3 & 4. Great news! UZ7HO has created a custom SoundModem for those 9k6 packets. The download is at → uz7.ho.ua/qubik.zip
Here is my tweet w/ info & screen shots → https://twitter.com/scott23192/status/1576833986759839744
I would still like to get the GNU Radio decoder working (test/flowgraphs · master · librespacefoundation / Qubik / COMMS Software · GitLab) but have not had any luck yet - it’s quite complex.
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The problem/challenge is, that it fully depends on the SatNOGS OOT modules.
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Yes, had to install a few dependencies but have all that working. As written, the RX flowgraph is for ‘live’ capture from an SDR w/ doppler correction. I’ve been trying to enhance that to work w/ recordings and/or audio files, but have not had success yet. Will keep trying!
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You only need to change the virtual input, here is the altered .grc
And you also removed some blocks that aren’t used. As you can see I also added a message block and a QT gui.
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Thanks so much! I had taken similar steps but do not have any decodes yet.
Will try again!
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I’ve just marked all the pocketqubes as re-entered in DB. Unfortunately it was sorter journey that we expected (couple of weeks).
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Thanks so much to PE0SAT so that I could get JSON decodes for the strongest packet I received last night! The gr-satnogs flowgraph is now configured so that I can replay my .RAW I/Q files from GQRX.
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That single QUBIK decode that I posted previously was from the last recording I had from 0629utc on 03-Oct-2022. It occurred to me that now that there was a flowgraph able to process I/Q recordings, I should also check the earlier pass I had from 0458utc on 03-Oct-2022. To my delight, that produced TWO decodes! Sorry that those sats were so short-lived.
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Qubik-3 “life”
I found this tle for Qubik3
qubik3
1 53958U 22122D 22276.12648951 .06815912 -35961-5 13724-2 0 9995
2 53958 136.8146 139.9788 0028428 135.0544 225.2109 16.28958072 225
It would be interesting to calculate the “life” of such satellite on low orbit.
I run the satevo prog, to see it. It has only one parameter, influences the decay process, this is the 10.7 cm radio flux.
On the sapceweather.com site the actual values is 155 sfu
Based on this the decay time of the Qubik3 is:
Final decay at 22276.855699, October 3.
The whole orbits are in the log file:
Orbital evolution for object 22122D
Decays after 0.7292 days on date = 22276.8557 (2022 October 3)
10.8 cm flux = 155.000000
qubik3 214 x 177 km
1 53958U 22122D 22276.12648358 .06815869 24332-1 13756-2 0 99996
2 53958 136.8146 139.9788 0028428 135.0544 225.1762 16.28957991 228
qubik3 211 x 175 km
1 53958U 22122D 22276.18777714 .07289279 28080-1 13609-2 0 99993
2 53958 136.8144 140.3798 0027532 135.5103 224.7110 16.29821842 233
qubik3 208 x 173 km
1 53958U 22122D 22276.24903699 .07815933 30583-1 13400-2 0 99995
2 53958 136.8142 140.7810 0026586 135.9666 224.2453 16.30746850 249
qubik3 205 x 171 km
1 53958U 22122D 22276.31026075 .08428329 36756-1 13157-2 0 99994
2 53958 136.8139 141.1827 0025593 136.4233 223.7790 16.31740207 251
qubik3 201 x 169 km
1 53958U 22122D 22276.37144565 .09157408 43045-1 12882-2 0 99996
2 53958 136.8137 141.5846 0024546 136.8803 223.3120 16.32815125 265
qubik3 197 x 167 km
1 53958U 22122D 22276.43258838 .10044103 53854-1 12572-2 0 99996
2 53958 136.8134 141.9869 0023425 137.3378 222.8441 16.33987048 275
qubik3 193 x 164 km
1 53958U 22122D 22276.49368489 .11233367 75690-1 12308-2 0 99998
2 53958 136.8131 142.3896 0022199 137.7957 222.3752 16.35282402 286
qubik3 188 x 161 km
1 53958U 22122D 22276.55472976 .12879493 10379+0 12070-2 0 99996
2 53958 136.8127 142.7927 0020835 138.2541 221.9049 16.36748950 291
qubik3 183 x 157 km
1 53958U 22122D 22276.61571546 .15236740 15261+0 11812-2 0 99999
2 53958 136.8123 143.1964 0019277 138.7131 221.4327 16.38454239 303
qubik3 176 x 153 km
1 53958U 22122D 22276.67663113 .18946816 27611+0 11021-2 0 99996
2 53958 136.8116 143.6007 0017437 139.1727 220.9580 16.40517659 315
qubik3 167 x 147 km
1 53958U 22122D 22276.73745931 .25998996 60290+0 87894-3 0 99998
2 53958 136.8110 144.0057 0015118 139.6333 220.4790 16.43198438 323
qubik3 154 x 139 km
1 53958U 22122D 22276.79816519 .45387817 22332+1 73465-3 0 99996
2 53958 136.8100 144.4118 0011746 140.0950 219.9914 16.47289776 330
Final decay at 22276.855699
t.janos, hg5apz
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Here is an analysis on GENESIS-J signal caught on October 4th.
https://twitter.com/gaoterop/status/1577435590261297152
and this is the discussion we had here:
It seems that the pocketqubes were a little more alive than I thought, however without having an accurate TLE it was very difficult to track them and have more accurate results.
PS Just to be clear, my decision to mark them as re-entered was based on the TLE sets we had available which were the latest ones published by space-track.org and the last ones published for these objects. With those TLE sets Network stations weren’t able to be scheduled for more observations, so I marked the satellites as re-entered.
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