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Oliver Jowett oliver.jowett at gmail.comOn Fri, 19 Jul 2019 at 15:58, Brad Walker <bwalker at musings.com> wrote: > I've been studying the rtl_adsb.c code and it's very interesting how it > works.. > > But, I have question. > > I noticed that if I request verbose output using the "-V" option, then the > CRC is printed out. But, it doesn't look like the code actually does any > Reed-Soloman error correction to the data the ADS-B specification > documents. > 1090MHz (Mode S extended squitter) ADS-B does not use R-S error correction, it's just a 24-bit CRC (or an xor of that with the aircraft address for some message types). Maybe you are thinking of 978Mhz (UAT) ADS-B, which is not handled by rtl_adsb at all? There is some error correction that's possible even with just the CRC but it's not particularly reliable. Oliver -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.osmocom.org/pipermail/osmocom-sdr/attachments/20190720/e535493a/attachment.htm>