Which system provides integrity information that can indicate GPS availability?

Which system provides integrity information that can indicate GPS availability?

• A. RAIM
• B. SBAS
• C. GBAS
• D. WAAS

Answer: (D)

Integrity information is what lets a user know whether GPS data can be trusted in a given area. WAAS provides that kind of data for the North American region by broadcasting integrity information along with corrections through its SBAS messages. This integrity data indicates whether the GPS service is considered available and trustworthy in the coverage area, so pilots and receivers can decide whether to rely on the GPS signals. RAIM is a receiver-based check that uses redundant measurements to verify consistency; it doesn’t broadcast an integrity status to indicate overall availability. SBAS is the broader family of systems that provide integrity and corrections, but WAAS is the specific system within that family that gives explicit integrity information about GPS availability in its domain. GBAS offers local, ground-based augmentation for precision approaches and isn’t used to indicate wide-area GPS availability.

Integrity information is what lets a user know whether GPS data can be trusted in a given area. WAAS provides that kind of data for the North American region by broadcasting integrity information along with corrections through its SBAS messages. This integrity data indicates whether the GPS service is considered available and trustworthy in the coverage area, so pilots and receivers can decide whether to rely on the GPS signals.

RAIM is a receiver-based check that uses redundant measurements to verify consistency; it doesn’t broadcast an integrity status to indicate overall availability. SBAS is the broader family of systems that provide integrity and corrections, but WAAS is the specific system within that family that gives explicit integrity information about GPS availability in its domain. GBAS offers local, ground-based augmentation for precision approaches and isn’t used to indicate wide-area GPS availability.