ADS-B surveillance involves aircraft automatically providing, via datalink, data derived from on-board navigation and position fixing systems.

ADS-B surveillance involves aircraft automatically providing, via datalink, data derived from on-board navigation and position fixing systems.

• A. Radar-based surveillance
• B. Surveillance in which aircraft automatically provide via datalink data derived from on-board navigation and position fixing systems
• C. Ground-based sensor only
• D. Weather data transmission

Answer: (B)

ADS-B surveillance works by having the aircraft automatically broadcast data that comes from its own navigation and position-fixing systems through a datalink. The airplane uses its on-board sensors (often GPS) to determine its position, altitude, and other flight information, and then continually transmits that data to air traffic control and other aircraft. This is what enables real-time tracking without relying on radar scans from the ground. The other concepts describe different methods—radar-based surveillance relies on ground radar to detect position, ground-based sensors alone don’t capture the aircraft’s own position data via broadcast, and weather data transmission is a separate function. In short, the surveillance system is defined by the aircraft generating and broadcasting its own position-derived data.

ADS-B surveillance works by having the aircraft automatically broadcast data that comes from its own navigation and position-fixing systems through a datalink. The airplane uses its on-board sensors (often GPS) to determine its position, altitude, and other flight information, and then continually transmits that data to air traffic control and other aircraft. This is what enables real-time tracking without relying on radar scans from the ground. The other concepts describe different methods—radar-based surveillance relies on ground radar to detect position, ground-based sensors alone don’t capture the aircraft’s own position data via broadcast, and weather data transmission is a separate function. In short, the surveillance system is defined by the aircraft generating and broadcasting its own position-derived data.