Latest Update 2024-08-15 10:00 UTC
Temporary NORAD ID
Satellite
Frequency
Notes
Deployed
AMATEUR UHF
98866 SR-0 DemoSAT
437.400 MHz
IARU Coordinated Directly
Latest Update 2024-08-15 10:00 UTC
ORIGINAL POST:
New Satellite Alert
Space Rickshaw-0 DemoSat Mission (SR-0), planned for launch onboard SSLV-D3 from SHAR, India. NET July 10.
IARU Coordination: IARU Sat Coordinator
Orbital Parameters: 480km circular, 37.2 degree Inclination.
Carrier Frequency: 437.4 Mhz Bandwidth: 125.0 kHz Spreading Factor: 9 Coding Rate: 7 Output Power: 22 dBm / 30 dBm Preamble Length: 8 Symbols Sync Word: 0x12 Gain: 0
LORA:
Carrier Frequency: 437.4 Mhz
AX.25/FSK
Frequency: 437.4 Mhz
Predicted TLE and webpage will be available soon.
Looking forward to all your support in tracking. Thank you.
Co-passenger: IITMSAT - IARU Sat Coordinator
7 Likes
fredy
June 20, 2024, 11:36am
2
Thanks for the info, in the next days we will prepare for this launch.
fredy
July 6, 2024, 7:20am
3
@riftron is the 10th of July still valid for the launch?
I can not find any official reference online for that date.
fredy
July 7, 2024, 6:56pm
5
Thanks for the update, then Iāll let it a little behind to focus to Ariane 6 which is on July 9th.
1 Like
fredy
July 26, 2024, 7:37am
6
2 Likes
Hello Everyone, the updated launch date is Aug 7th.
2 Likes
ENSFNM
August 1, 2024, 10:56pm
8
Latest post today mentions a date of August 15th now.
1 Like
ENSFNM
August 8, 2024, 3:43am
9
2 Likes
fredy
August 12, 2024, 9:41am
10
First post is updated with the satellite table. @riftron please confirm the differences from the IARU coordination page of SR-0 DemoSAT:
No SSDV transmission
FSK is at 1k2 instead of 9k6
2 Likes
K4KDR
August 14, 2024, 3:16am
11
Since the SR-0 Team hasnāt had a chance to reply to your question, I didnāt want to leave it un-answered.
I donāt have any info on the SSDV mode, but the FSK is definitely 1k2. The sample file that I was provided:
https://www.qsl.net/k/k4kdr//sample-files/SR-0/
ā¦ decodes fine as 1k2 FSK AX.25:
ā¦ if anyone would like my GNU Radio flowgraph as a starting point to adjust to their own preferences, youāre welcome to that at:
https://www.qsl.net/k/k4kdr//grc/SR-0/
6 Likes
fredy
August 14, 2024, 8:58am
12
According to this tweet the new launch date is 2024-08-16 03:47 UTC
2 Likes
Hello Everyone.
Sorry for the delayed response. We were stuck with the launch integration and operations here.
Weāre facing some small issues with our faketle creation tool, and trying to fix that, meanwhile, posting the orbital elements themselves here, so you can try to generate it with your own faketle tool and share the preliminary TLE. The transmission will begin T+30.00 minutes after spacecraft separation. Will keep you all updated.
ORBITAL ELEMENTS:
SEMI MAJOR AXIS (KM) : 6849.998542
ECCENTRICITY : 0.00055435
INCLINATION (DEG) : 37.394644
RAAN (DEG) : 299.230504
ARG. OF PERIGEE (DEG) : 342.314137
TRUE ANOMALY (DEG) : 217.861578
PERIGEE(KM) : 468.064223
APOGEE (KM) : 475.658861
1 Like
Thereās No SSDV in this mission, we have to move to the next one due to a change in mission configuration. Both 1k2 and 9k6 AX.25 are available but 1k2 has been kept as default because of itās simplicity in receiving setup.
Note: IITMSat has been offloaded from this launch due to some technical issues that we donāt know of yet, so a mass simulator is flying instead. Their next launch slot would be updated on their website sometime later.
1 Like
fredy
August 15, 2024, 10:14am
15
Thanks for the info! Iāll update DB and first post accordingly.
For the TLE Iāll take a look later today, except if someone else chime in.
fredy
August 15, 2024, 10:17am
16
Hmā¦ just to be clear, does this mean that 1k2 will remain the active one for the whole flight or there is a chance to be changed?
If the latter Iām going to add one more āinactiveā transmitter for 9k6 which could be changed later to āactiveā if there is a change.
9k6 can be requested via telecommand. more details on that we will announce soon.
dl7ndr
August 15, 2024, 2:40pm
18
*1 98866U 24229.18036921 .00000000 00000-0 50000-4 0 08*
*2 98866 37.3946 299.2305 0005544 342.3141 218.0000 15.31325089 05*
Generated using the tool fakeTLE from sattools .
./faketle -q 468.064223 -Q 475.658861 -I 37.394644 -n 299.230504 -w 342.314137 -m 218.00 -t 2024-08-16T04:03:09 -i 98866 -d 994.9
The value for the last parameter (-d 994.9) [āTime offset from epoch (s)ā] comes from page 4 of the SSLV-D3 Mission Brochure .
The TLE above are probably wrong due to a misinterpretation of āEpoch ā as āLift offā (as it is used for faketle).
If lift off is at 2024-08-16 03:47 UTC as fredy stated (I cannot find this launch time on the mentioned tweet), please use the following TLE :
1 98866U 24229.16915394 .00000000 00000-0 50000-4 0 06
2 98866 37.3946 299.2305 0005544 342.3141 218.0000 15.31325089 05
./faketle -q 468.064223 -Q 475.658861 -I 37.394644 -n 299.230504 -w 342.314137 -m 218.00 -t 2024-08-16T03:47 -i 98866 -d 994.9
Please make sure you also copy the spaces between the numbers.
3 Likes
dl7ndr:
Epoch
Please use the separation event as an epoch and no need to add any delay in the last. since it is the epoch of separation event by itself.
Weāre getting errors while installing sattools, if somebody could help, would be deeply appreciated. please feel free to DM.
1 Like
fredy
August 16, 2024, 3:28am
20
Everything ready for the launch! Network has been scheduled for the first 12 hours to track SR-0!
1 Like
