The TUBIN satellite takes infrared pictures and transmits them on S-band using the "HiSPiCO" transmitter. Decoding this without a matching hardware receiver was hindered by the use of an undocumented forward error correction scheme, making it inaccessible to radio amateurs. Using a "known-plaintext" pair of I/Q data and decoded data provided by TU Berlin, I've managed to reverse engineer the FEC and implemented a software receiver using GNU Radio and Rust :3

📷 Las Vegas, 2025-11-07