Post-obs script not getting arguments

SatNOGS Software
1

I am trying to set up my post-obs script in such a way that it only runs for some specific satellites. I found a solution on these forums written in bash that extracts the NORAD ID from the TLE but when I tried using the same code it didn’t get anything; Modified "upload IQ files to Dropbox script" selecting satellites with linear transponders - #2 by mfalkvidd

I wanted to implement the same functionality in python as that is easier for me to work with, but starting even with a single command to display the arguments passed to the script by satnogs already fails, as it appears that the script is getting no arguments whatsoever…
This is what my post-obs “script” currently looks like;

#!/usr/bin/python3
import sys
print("Running post-obs script")
print(sys.argv)
print("End of post-obs script")

And this is what I get in the output;

Aug 28 14:30:05 raspberrypi satnogs-client[770]: Running post-obs script
Aug 28 14:30:05 raspberrypi satnogs-client[770]: ['/home/pi/post-obs/main.py']
Aug 28 14:30:05 raspberrypi satnogs-client[770]: End of post-obs script

Instead of the arguments such as TLE, obs ID, etc it gets nothing.
I am assuming the exact same issue was happening back when I was using the bash sh script, though I couldn’t check for that as I have no idea how to use bash and list all arguments for debug like this.

I have already spent most of the weekend trying to get this to work, I am a bit overwhelmed with the way satnogs works, so any tips would be appreciated

2

SatNOGS Client Setup - SatNOGS Wiki lists the variables that are available (search for SATNOGS_POST_OBSERVATION_SCRIPT on that page)

Did you configure the post observation script with the variables in satnogs-setup? This is what mine looks like:

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3

Yeah that was it, I had no idea I had to pass the arguments, thanks. Seems to be working now (or at least it managed to differentiate between XW-2F and a NOAA satellite). Hopefully now I can safely allow my station to track other satellites without trying to process them as APT.
I think this was about the biggest hurdle I had to overcome, now I just have to figure out how to get the raw IQ file from the observation at a specific sample rate and I should be able to add any custom decoders I want

1 Like
4

The path to the IQ file will be available in the IQ_DUMP_FILENAME environment variable.

The sample rate will vary depending on the transmitter, but you can probably convert to your desired rate with sox.

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5

If you haven’t already, you need to enable output of the IQ file. Uploading compressed IQ files to Dropbox (or any other cloud storage provider) describes how to do that.

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