JAMX01 SSDV on Windows
[JAMX01 Current Operational Status]
435.075 MHz = BPSK 9600
435.075 MHz = SSDV B
435.500 MHz = SSDV A
435.500 MHz = Also serves as the downlink for FM voice repeater.
SSDV imaging has become a hot topic at Libre_Space, and beautiful kaleidoscope-like images
are indeed being obtained. According to the information, Lilacsat-soundmodem-CLi.zip and
ASRTU-1-EN.exe appear to be required. However, ASRTU-1.exe is flagged as a virus on Windows,
preventing it from being downloaded. So, I am currently exploring other methods.
The following visualization application was developed. "ASRTU_Series_Receiver_Setup_1.5.4"
[Initial Concept] Windows + Radioconda + gr-satellites v5.9.0
[Install radioconda-2025.03.14-Windows-x86_64]
[Install gr_satellites v5.9.0]
> Open Windows - Start Menu
> Find "Anaconda Prompt"
> Right click on "Anaconda Prompt"
> Select "Run as administrator"
> conda install -c conda-forge gnuradio-satellites=5.9.0
> C:\ProgramData\radioconda>gr_satellites --version
> gr_satellites v5.9.0
[Excerpt from ChatGPT's response]
How can I convert a WAV recording of the SatNOGS JAMX01 satellite's SSDV signal into
a JPG image using gr-satellites?
If you can capture the JAMX01 SSDV signal as a WAV file via SatNOGS, the best approach is
to first extract the 223-byte JAMX01's frames from WAV file using "gr-satellites", and
then convert the proprietary JAMX01 format into the standard SSDV for conversion into
a JPEG image.
Regarding JAMX01, recent analysis has reported that a standard SSDV packet can be obtained
by taking 223-byte CCSDS telemetry packet, removing the initial 5-byte CCSDS Primary Header,
and prepending the sequence "55 + 4-byte callsign + 66". In fact, they have successfully
reconstructed images from SatNOGS captures. First, they extract frames from the WAV file.
The issue here is that v5.9.0 cannot recognize JAMX01 as a satellite. Therefore, you need to
provide the configuration for JAMX01 to gr_satellites. Since there is no satellite definition
for JAMX01 in v5.9.0, you cannot simply run "gr_satellites JAMX01...". First, you need to
demodulate the signal from WAV file and extract the 223-byte JAMX01 packets.
SatNOGS, #14907288
Duration:217 seconds
Stream #0:
Audio samplr size:16 bit
Bit rate:768 kbps
Sample rate:48.000 kHz
Channels:1
In fact, the current JAMX01 analysis has confirmed that imaging is possible using
the following transformation.
SatNOGS WAV
:
gr_satellites
:
223-byte CCSDS telemetry packet
:
Remove the leading 5 bytes (CCSDS Primary Header).
:
0x55 + 4-byte callsign + 0x66, Add this to the beginning.
: -> See [note]
Standard SSDV packet
:
SSDV decoder
:
JPEG
[note] JAMX01 uses a CRC initial value of "0x6AAAC1C5"
[ASRTU_Series_Receiver_Setup_1.5.4]
JAMX01 SSDV, #14907288
