SpaceX F9: 425 Project EO/IR - VSFB SLC-4E - 2023-12-01 18:19 UTC

fredy · December 2, 2023, 2:02am

Based on latest TLE set by @PE0SAT for EIRSAT-1, I’ve adjust them a little in order to propagate the epoch and be able to use the TLE set in DB and Network (latest TLE is the one with the biggest epoch):

EIRSAT-1
1 99320U          23335.90000000  .00000000  00000-0  50000-4 0    00
2 99320  97.4600  42.9329 0000695  42.4776  99.8279 15.15323734    08

sche321mish · December 2, 2023, 2:26am

I am trying to schedule observation of Hayasat 2023-12-02 19:30 to 2023-12-02 19:50 UTC, and getting this error: “Scheduling observation that starts at 2023-12-02 19:41:22 UTC exceeds scheduling limit for the period from 2023-11-30 21:01:59 UTC to 2023-12-02 21:01:49 UTC Reason for scheduling limit: Hayasat(99032) is frequency violator satellite”.
But my observation would be within the scheduling limits, why this error then?

I am new to this, so pardon me if I am missing something obvious.

What are the rules for satellites like this, is it not possible to observe them at all once we move out of certain post-launch window?

Disclosure I am not directly affiliated with the team, just a fan of the project.

K4KDR · December 2, 2023, 2:32am

EIRSAT-1 was much stronger than I expected for the first U.S. pass because the max elevation wasn’t even 20°! That Team should be very proud of getting off to such a good start. Thanks to everyone who helped identify the best TLE!

fredy · December 2, 2023, 2:34am

Hi @sche321mish and welcome to the SatNOGS and LSF community.

Hayasat’s frequency is on radio amateur band, according to its ITU entry, and not coordinated by IARU.

In such cases there are some limits on the scheduling, you can find more details in this thread. If you have further questions let me know.

sche321mish · December 2, 2023, 2:47am

Aha, got it. Makes sense.

fredy · December 2, 2023, 8:06am

There are already some TBA (to be assigned) TLE sets from space-track.org:

0 TBA - TO BE ASSIGNED
1 58462U 23185A   23335.89174235 -.00000060  00000-0  00000+0 0  9995
2 58462  97.6459  40.6839 0011371 245.3691 205.9455 15.01581509    16
0 TBA - TO BE ASSIGNED
1 58463U 23185B   23335.97325529  .00557363  00000-0  40440-1 0  9995
2 58463  97.6470  40.7588 0011084 249.2851 282.4577 15.01743474    21
0 TBA - TO BE ASSIGNED
1 58464U 23185C   23335.89534894 -.00000060  00000-0  00000+0 0  9998
2 58464  97.6459  40.6773 0010242 254.2680 216.7294 15.02094607    18
0 TBA - TO BE ASSIGNED
1 58465U 23185D   23335.95669727 -.00000066  00000-0  00000+0 0  9996
2 58465  97.4570  40.5120 0009512 254.1696 195.9820 15.15952127    39
0 TBA - TO BE ASSIGNED
1 58466U 23185E   23335.95940042 -.00000067  00000-0  00000+0 0  9990
2 58466  97.4552  40.5108 0011160 252.4359 212.6308 15.16297676    35
0 TBA - TO BE ASSIGNED
1 58467U 23185F   23335.96022360 -.00000067  00000-0  00000+0 0  9996
2 58467  97.4542  40.5087 0011842 256.7261 212.9008 15.16460255    32
0 TBA - TO BE ASSIGNED
1 58468U 23185G   23336.02393267 -.00000067  00000-0  00000+0 0  9992
2 58468  97.4553  40.5772 0012642 252.5383 204.8141 15.16643494    41

bcsak · December 2, 2023, 9:39am

… and a few decoded frames from EIRSAT-1 using our station (2380): SatNOGS Network - Observation 8636962

fredy · December 2, 2023, 9:41am

A status update, based on the space-track.org TLE sets, note that these TLE sets are still to be assigned and may describe a group of satellites, also we expect at least 18 (25 satellites - 7 objects) more TLE sets:

Temporary NORAD ID	Satellite	NORAD ID to follow	Other NORAD IDs	Identified	Deployed	Last Update
RECEIVED AND DEMODULATED
98968	ION SCV Daring Diego	58463	58462, 58464	NO	YES	Received, changed to follow 58463, other possible 58462, 58464
99320	EIRSAT-1	58468	58467, 58466(unlikely)	NO	YES	Received, demodulated by 3rd parties, changed to follow 58468, other possible 58467, 58466(unlikely)
99011	SpIRIT	58468	58465, 58466, 58467	NO	YES	Received, demodulated by 3rd parties, changed to follow 58468, other possible 58465, 58466, 58467
98971	ENSO	58468	58465, 58466, 58467	NO	YES	Received, changed to follow 58468, other possible 58465, 58466, 58467
RECEIVED
98969	uHETSat	58466	58465(unlikely), 58467, 58468(unlikely)	NO	YES	Received, changed to follow 58466, other possible 58465(unlikely), 58467, 58468(unlikely)
NOT RECEIVED WITH FREQUENCY
99032	Hayasat	58465	all	NO	UNKNOWN	Randomly chosen to follow 58465, all the objects are possible candidates
98970	KOYOH	58465	all	NO	UNKNOWN	Randomly chosen to follow 58465, all the objects are possible candidates

deckbsd · December 2, 2023, 10:38am

Hello,

Has anybody get information about the AX25 frame structure of ENSO ? It would be nice to be able to have frames decoded once gr-satnogs will be setup for good demodulation.

Dereckt · December 2, 2023, 11:12am

Hi @deckbsd, thanks for your interest
We’re currently working on that, I’ll keep you informed on that, probably monday

See you

SA2KNG · December 2, 2023, 2:11pm

What is the reason for the -1 multiplier ?
the cli tool have at least two options that can take negative numbers to invert, --input_gain -1 and for the fsk modes --deviation -500 (or whatever the deviantion needs to be)

fredy · December 2, 2023, 2:30pm

More objects added in space-track.org list for this launch:

0 TBA - TO BE ASSIGNED
1 58462U 23185A   23335.89174235 -.00000060  00000-0  00000+0 0  9995
2 58462  97.6459  40.6839 0011371 245.3691 205.9455 15.01581509    16
0 TBA - TO BE ASSIGNED
1 58463U 23185B   23335.97325529  .00557363  00000-0  40440-1 0  9995
2 58463  97.6470  40.7588 0011084 249.2851 282.4577 15.01743474    21
0 TBA - TO BE ASSIGNED
1 58464U 23185C   23335.89534894 -.00000060  00000-0  00000+0 0  9998
2 58464  97.6459  40.6773 0010242 254.2680 216.7294 15.02094607    18
0 TBA - TO BE ASSIGNED
1 58465U 23185D   23335.95669727 -.00000066  00000-0  00000+0 0  9996
2 58465  97.4570  40.5120 0009512 254.1696 195.9820 15.15952127    39
0 TBA - TO BE ASSIGNED
1 58466U 23185E   23335.95940042 -.00000067  00000-0  00000+0 0  9990
2 58466  97.4552  40.5108 0011160 252.4359 212.6308 15.16297676    35
0 TBA - TO BE ASSIGNED
1 58467U 23185F   23335.96022360 -.00000067  00000-0  00000+0 0  9996
2 58467  97.4542  40.5087 0011842 256.7261 212.9008 15.16460255    32
0 TBA - TO BE ASSIGNED
1 58468U 23185G   23336.02393267 -.00000067  00000-0  00000+0 0  9992
2 58468  97.4553  40.5772 0012642 252.5383 204.8141 15.16643494    41
0 TBA - TO BE ASSIGNED
1 58469U 23185H   23336.29103778 -.00000060  00000-0  00000+0 0  9991
2 58469  97.6460  41.0767 0010832 246.3979 202.2507 15.01697850    72
0 TBA - TO BE ASSIGNED
1 58470U 23185J   23336.26995339 -.00000067  00000-0  00000+0 0  9999
2 58470  97.4562  40.8209 0013089 250.4589 109.5211 15.16782945    81
0 TBA - TO BE ASSIGNED
1 58471U 23185K   23336.26996775 -.00000067  00000-0  00000+0 0  9995
2 58471  97.4570  40.8243 0013059 249.4288 110.5734 15.16745637    89
0 TBA - TO BE ASSIGNED
1 58472U 23185L   23336.26998885 -.00000067  00000-0  00000+0 0  9990
2 58472  97.4551  40.8178 0013018 250.3205 109.7674 15.16729794    80

from @PE0SAT 58470 seems to be the best much for now for EIRSAT-1:

K4KDR · December 2, 2023, 3:13pm

It was trial & error… I remembered the instruction:

Note: these recordings do need to be played back with a gain of -1 in gr-satellites

that the team mentioned at

github.com

ucd-eirsat-1/beacon/blob/main/README.md

# EIRSAT-1 Beacons (and other data)

## Downlink

EIRSAT-1 downlinks data to Earth in the UHF amateur band at 437.1 MHz. This frequency has been coordinated by the [International Amateur Radio Union](http://www.amsatuk.me.uk/iaru/finished_detail.php?serialnum=639).

### The Technical Standards Stuff
The downlink is GMSK modulated at a data rate of 9600bps. Downlinked data is made up of PUS (Packet Utilisation Standard) packets contained in CCSDS (Consultative Committee on Space Data Systems) frames. The frames are 892 bytes long but are Reed-Solomon encoded with a dual basis and an interleaving depth of 4. A CCSDS scrambler is used on the frame and Reed-Solomon bytes to help clock-recovery of the signal on the ground.

This means that EIRSAT-1 transmits a CCSDS-standard 4-byte ASM (Attached Synchronisation Marker) of 1ACFFC1D, followed by the 892 bytes of the CCSDS frame, followed by 128 bytes of Reed-Solomon Forward Error Correcting bytes, for a total of 1024 bytes.

EIRSAT-1 also supports convolutional (also known as Viterbi) encoding and will launch with this enabled. Convolutional encoding improves the Bit Error Rate but halves the data throughput, so once the link budget has been demonstrated to have positive margin on orbit, convolutional encoding will be disabled. The polynomials used in the encoding are [79, 109]. Note that this is similar to the CCSDS specification but the second polynominal is not inverted as it should be in the CCSDS spec.

### I don't understand any of that!

That's okay! When we started building EIRSAT-1 we didn't understand any of that stuff either!

As we developed the EIRSAT-1 Ground Station, we relied heavily on [GNU Radio](https://www.gnuradio.org/) and in particular, the excellent [gr-satellites](https://gr-satellites.readthedocs.io/) module. The result is that we can express the full knowledge required to decode an EIRSAT-1 downlink signal into a single file known as a SatYAML file which gr-satellites can use. You'll find this file in the SatYAML folder.

This file has been truncated. show original

… so I didn’t know if that would apply to the file being used to test or not. No idea if that will apply to every recording source

K4KDR · December 2, 2023, 3:15pm

#58470 did indeed track pretty close for EIRSAT-1 doppler correction on the pass over the U.S. East Coast this morning (02-Dec-2023), but at this elevation I didn’t QUITE have enough SNR to decode. Will look forward to higher passes another time!

fredy · December 3, 2023, 12:10am

A status update with the new TLE from space-track.org, that are now assigned. While in some cases we have very good fits, we expect more sets (we have 11 from at least 25 for now), so we are going to delay identification for a couple of days.

Temporary NORAD ID	Satellite	NORAD ID to follow	Other NORAD IDs	Identified	Deployed	Last Update
RECEIVED AND DEMODULATED
98968	ION SCV Daring Diego	58469	-	NO	YES	Received, changed to follow 58469, removed 58462, 58463, 58464
99320	EIRSAT-1	58470	58471, 58472	NO	YES	Received, changed to follow 58470, other possible 58471, 58472, removed 58468, 58467, 58466(unlikely)
99011	SpIRIT	58467	58466(unlikely), 58468, 58470(unlikely), 58471(unlikely), 58472(unlikely)	NO	YES	Received, demodulated by 3rd parties, changed to follow 58467, other possible 58466(unlikely), 58468, 58470(unlikely), 58471(unlikely), 58472(unlikely), removed 58465
98971	ENSO	58471	58468(unlikely), 58470, 58472	NO	YES	Received, changed to follow 58471, other possible 58468(unlikely), 58470, 58472, removed 58465, 58466, 58467
RECEIVED
98969	uHETSat	58466	58465(unlikely), 58467, 58468(unlikely)	NO	YES	Received, no change
99032	Hayasat	58472	58465(unlikely), 58467(unlikely), 58468, 58470, 58471	NO	YES(?)	Received, not demodulated there is a chance not to be it. changed to follow 58472, other possible 58465(unlikely), 58467(unlikely), 58468, 58470, 58471
NOT RECEIVED WITH FREQUENCY
98970	KOYOH	58465	all	NO	UNKNOWN	Randomly chosen to follow 58465, all the objects are possible candidates

Note: While the status above is based on ikhnos results, several of them are just confirmations of @PE0SAT more accurate checks using strf observations and tools.

bcsak · December 3, 2023, 11:48am

58470 still looks very decent for EIRSAT-1: SatNOGS Network - Observation 8639988

fredy · December 3, 2023, 2:16pm

Indeed but it is very close to 58471 and 58472, it will need a couple of days for a better separation.

By the way I’ve seen in nasaspaceflight thread that D-Orbit has published info for this mission of ION

4 cubesats and one alba orbital deployer with 4 pocketqubes, plus some hosted paylaods:

LOGSATS (3U, Patriot Infovention, Thailand)

NanoFF A/B (2x 2U, TU Berlin, Germany)

ALISIO-1 (6U, IACTEC, Spain)

RECS (hosted, Politecnico di Milano, Italy)

Z01™ SuperTorquer (hosted, Zenno Astronautics, New Zealand)

MI:1 (hosted, TRL11, US)

Pono 1 (hosted, Privateer, US)

Albapods (hosted, Alba Orbital, UK) carrying the three Unicorns and MDQubesat-1 by Miota Space (weirdly different to the previously announced MDQUBESAT-2 by Innova Space)

Beyond Mission Bookletpdf.pdf (5.2 MB)

fredy · December 3, 2023, 3:55pm

Two updates on transmitters of satellites for this launch:

HAYASAT uses FSK 9k6 and it is received and demodulated.

uHETSat (confirmed only by frequency) signal is 38k4 but we still try to confirm the modulation, probably FSK.

PE0SAT · December 3, 2023, 3:58pm

For those that want to decode HAYASAT with gr-satellites:

There is the assumption that the callsign EK6xxx tells us this is indeed HAYASAT, no 100% confirmation yet.

name: HAYASAT
norad: 99032
data:
  &tlm AX25 telemetry:
    telemetry: ax25
transmitters:
  9k6 G3RUH FSK downlink:
    frequency: 437.020e+6
    modulation: FSK
    baudrate: 9600
    framing: AX.25 G3RUH
    data:
    - *tlm

-> Packet from 9k6 G3RUH FSK downlink
Container: 
    header = Container: 
        addresses = ListContainer: 
            Container: 
                callsign = u'EK6TWD' (total 6)
                ssid = Container: 
                    ch = True
                    ssid = 0
                    extension = False
            Container: 
                callsign = u'EK1HYS' (total 6)
                ssid = Container: 
                    ch = True
                    ssid = 0
                    extension = True
        control = 0x03
        pid = 0xF0
    info = b'\x01\x11\x013\x01\x01\x01\x10\x00\x01\x0b\x01 \x00\x00\x00Q\x07:\x00\x00\x00\x19\x00\x01$\x00\x00\x00\x00\x00\x00\x1c\x00\x00\x00\xe5~\x01\x08\x07=\x03$\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xa5\xe8\x03\x1b\x00\x00.\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00' (total 77)

bcsak · December 3, 2023, 10:04pm

Indeed, now there is a little drift: SatNOGS Network - Observation 8644203, EIRSAT-1 is a bit behind of 58470.