Signals decoder

FlightDecode

Raw ADS-B transponder frames - the 1090 MHz Mode S extended-squitter that every airliner broadcasts - decoded in pure C#. Three real captured frames from three different aircraft become a callsign, a position on the globe, an altitude, and a velocity vector.

How to read it: each 112-bit frame is 14 bytes of hex. The decoder checks its CRC-24 (a match, shown OK, proves the frame is intact), reads the type code to learn what the frame carries, then extracts the fields. Airborne position needs an even and an odd frame decoded together (CPR).