Space 23 June 2025 - 27 June 2025

Automatic Dependent Surveillance–Broadcast is an aircraft surveillance technology that has transformed how air traffic is monitored. In simple terms, ADS-B equips aircraft with GPS-based transponders that automatically broadcast their precise position, identity, altitude, velocity and other data to anyone with the proper receiver faa.gov aireon.com. The system is dependent on onboard navigation sources for accuracy and broadcasts its information periodically without any pilot or controller input faa.gov. ADS-B emerged in the early 2000s as part of aviation modernization efforts to replace or augment traditional radar. Unlike radar – which sends out radio waves and requires bulky ground antennas to detect reflected signals – ADS-B uses satellite navigation signals and direct broadcasts from aircraft faa.gov faa.gov. In effect, ADS-B leverages satellites for positioning instead of ground-based radar, allowing more precise and frequent updates faa.gov.