Which navigation system capability is described as verifying GPS integrity?

Which navigation system capability is described as verifying GPS integrity?

• A. RAIM
• B. GNSS
• C. DME
• D. VOR

Answer: (A)

Integrity verification for GPS is provided by RAIM, short for Receiver Autonomous Integrity Monitoring. The idea is that a GPS receiver uses the extra measurements from multiple satellites to check for inconsistencies in the data. By testing the consistency of each satellite’s range measurement—often by removing one satellite at a time or using redundancy—the receiver can detect if a satellite is delivering faulty information and determine whether the overall solution can be trusted. If enough healthy satellites remain, RAIM can warn of a potential integrity issue and, in many cases, pinpoint the faulty source. When there aren’t enough satellites to provide redundancy, the receiver cannot guarantee integrity. This is different from GNSS as a whole, which is the set of satellite navigation systems, while DME and VOR are ground-based aids that don’t perform GPS integrity checks.

Integrity verification for GPS is provided by RAIM, short for Receiver Autonomous Integrity Monitoring. The idea is that a GPS receiver uses the extra measurements from multiple satellites to check for inconsistencies in the data. By testing the consistency of each satellite’s range measurement—often by removing one satellite at a time or using redundancy—the receiver can detect if a satellite is delivering faulty information and determine whether the overall solution can be trusted. If enough healthy satellites remain, RAIM can warn of a potential integrity issue and, in many cases, pinpoint the faulty source. When there aren’t enough satellites to provide redundancy, the receiver cannot guarantee integrity. This is different from GNSS as a whole, which is the set of satellite navigation systems, while DME and VOR are ground-based aids that don’t perform GPS integrity checks.