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View Code? Open in Web Editor NEWReverse Engineering of the Vaisala RS41 Radiosondes Data Frame Format
Reverse Engineering of the Vaisala RS41 Radiosondes Data Frame Format
Hi,
i have written fsk demod and not very finished frame decoder in python. It might be used as "possible" implementation if someone is interested in signal processing. I just thought i share :-)
https://gist.github.com/robots/ae3e7286d408c901836666418597ea86
Hi!
Thanks for sharing your knowledge and code. It may not be worth a pull/merge request, but I had some difficulties getting started.
It seems that both recordings in rs41/wav are inverted. The rs41/README.md mentions inverted signals and could be expanded by the following example to be used with the wav file from the repository out of the box:
$ sox ./wav/20140717_402MHz.wav -t wav - lowpass 2800 2>/dev/null | ./rs41ptu --ecc --crc -vx -i
Cheers
Just a FYI that @rs1729 added support for decoding of RS41-SGM unencrypted telemetry in his rs41mod decoder here: https://github.com/rs1729/RS/blob/master/demod/mod/rs41mod.c#L1265
We added support into radiosonde_auto_rx, and have been able to track and recover quite a few RS41-SGM sondes that were launched near Adelaide.
The example frame field 7D - GPSRAW
has two bit errors, which lead to a checksum error if CRC is applied. Byte 0x0DA
should be 0x46
and byte 0x100
should be 0xde
. Both errors originate in a single bit error. With those changes applied to the field, the correct checksum 0xbd9e
will be calculated.
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