With the 44th anniversary of the launch of Voyager 1, [Daniel] Decided to use GNU Radio Decoding Voyager DataThe data is not real-time, but records from the Green Bank Telescope. The 16 GB file is in GUPPI format and is used to store the original IQ samples.
The file contains 64 channels, each of which is slightly below 3MHz. The signal of interest is in one channel, so it is easy to discard the rest of the data.
Python blocks manipulate files and provide data sources. Once you have it, the rest is pretty standard processing, although as you would expect, the signal is very weak even with a 100-meter antenna. The big Fourier transform can solve the problem.
Then there is the problem of decoding, although some obscure keys are required to extract the data correctly. In the end, it all appeared, and this is a great detective story about how to browse through the data step by step.
What Voyager has done with old technology is surprising. If you need a bootloader for GNU Radio, please check our series.