ADS-B transmissions are derived from which data sources?

ADS-B transmissions are derived from which data sources?

• A. Ground-based weather sensors
• B. Ground radar data
• C. On-board navigation and position fixing systems
• D. Pilot communications

Answer: (C)

ADS-B transmissions come from on-board navigation and position fixing systems. The “dependent” aspect means the aircraft determines its own position using its onboard sensors—typically a GNSS receiver (like GPS) complemented by other instruments for altitude, heading, and speed—and then broadcasts that information. Because the position data originate from the aircraft itself, ADS-B Out provides surveillance independent of ground radar or ground sensors. Ground-based weather sensors or ground radar supply separate information to controllers, not the data that ADS-B transmits, and pilot communications are unrelated to generating ADS-B position data.

ADS-B transmissions come from on-board navigation and position fixing systems. The “dependent” aspect means the aircraft determines its own position using its onboard sensors—typically a GNSS receiver (like GPS) complemented by other instruments for altitude, heading, and speed—and then broadcasts that information. Because the position data originate from the aircraft itself, ADS-B Out provides surveillance independent of ground radar or ground sensors. Ground-based weather sensors or ground radar supply separate information to controllers, not the data that ADS-B transmits, and pilot communications are unrelated to generating ADS-B position data.