El 09/08/16 a las 04:31, Scott escribió:
Telemetry from both of those satellites is quite active; while it's fun receiving the RF and pulling out the raw hex data, unfortunately there is currently NOT a decoder that I am aware of to display meaningful values.
The bulk of the work to get us this far was done by Dani Estevez. His work is extraordinary and is documented at:
http://destevez.net/2016/06/trying-to-decode-data-from-nusat/
Thanks for linking my blog, Scott. Unfortunately that's all we can do by now.
The satellite uses CBOR to compress the telemetry into small binary packets. Some of the guys at Satellogic (the company that operates the satellites) were going to send me some details, but nothing received so far. Probably it's not so easy and they're busy enough.
The downside is that we don't even have a way to check that the packets are received without bit errors. The last 4 bytes of the packet seem to be the ones which vary the most, so kudos if someone can recognise that as a CRC of the packet. I tried for a while, but got nothing.
By the way, it's 40k baud, not 38k4. It eats a huge chunk of spectrum (about 80kHz).
73,
Dani.