<p>➀ The article provides a step-by-step guide to building a flight tracker using a Raspberry Pi and an SDR receiver, leveraging ADS-B signals from aircraft;</p><p>➀ It details configuring software like FlightRadar24 or OpenSky to decode flight data and display real-time tracking via web interfaces;</p><p>➂ The setup involves antenna optimization, signal filtering, and sharing flight data with global networks for enhanced coverage and accuracy.</p>