ADS-B: What is it, and How does it work?
ADS-B — Operational Briefing ADS-B: What is it, and How does it work? What it is, how it works, the transponder modes it builds on, where each is required — and exactly how ADS-B sits alongside TCAS on the flight deck. Aviation2day · April 2026 · 10 min read GND STATION ATC ICAO: 4CA2B1 ALT: FL340 GS: 468kt CALLSIGN: KQ101 ADS-B OUT · 1090 MHz · AUTOMATIC BROADCAST ADS-B — Automatic Dependent Surveillance–Broadcast — is the surveillance technology that has fundamentally changed how air traffic control sees you, and how you can see other traffic. Unlike radar, which relies on ground equipment to interrogate your transponder an...