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2 votes
1 answer
1k views

How to extract the interrogator ID from a DF11 message?

I've written a class which decodes raw Mode S messages. Whilst browsing the ICAO specs the other day I noticed that the Interrogator ID is sent back in the DF11 message. I thought that it would be a ...
Philip Lee's user avatar
5 votes
2 answers
2k views

Can ADS-B DF-17 messages with a non-zero remainder after CRC check be used?

For fun I've been using an AirSPy SDR (Software Defined Radio) to receive and decode ADS-B packets, primarily DF-11 and DF-17 messages. The code is written in C++ and works reasonably well. It ...
Max van Daalen's user avatar