Imaging from Passing Satellites Using a $10 SDR by Decoding 137 MHz Signals

A hobbyist demonstrates how to turn inexpensive hardware into a satellite imaging tool. The approach uses a $10 software‑defined radio (SDR) tuned to the 137 MHz band. Signals from passing satellites are captured as raw radio data. Custom decoding software extracts image information from the captured signals. The method produces visual pictures without needing costly ground stations. It showcases the potential of low‑budget hardware for remote sensing. The project is documented on the author’s personal site. Readers can replicate the setup using the provided code and hardware list.