Which mechanisms provide GNSS integrity monitoring beyond RAIM in modern receivers?

Which mechanisms provide GNSS integrity monitoring beyond RAIM in modern receivers?

• A. RAIM is sufficient; no other integrity mechanisms exist.
• B. Fault Detection/Exclusion (FDE) and SBAS/GBAS integrity support in modern receivers.
• C. Ground-based augmentation is the only mechanism.
• D. GNSS integrity cannot be monitored.

Answer: (B)

Beyond internal consistency checks like RAIM, modern receivers rely on two additional mechanisms to ensure GNSS integrity: fault detection/exclusion and augmentation systems such as SBAS and GBAS. RAIM tests the measurements to see if a subset of satellites yields a coherent solution, but it doesn’t identify which satellite is faulty or provide external integrity data. Fault Detection/Exclusion explicitly detects faults and can exclude the offending satellite to maintain a reliable solution.augmentation systems take integrity a step further by delivering external integrity information and corrections: SBAS provides wide-area integrity messages and corrections, helping the receiver compute protection levels and issue alerts when needed, while GBAS offers localized, airport-area integrity and corrections to support precision approaches. Together, these mechanisms extend integrity monitoring beyond what RAIM alone can offer. Ground-based augmentation exists, but SBAS/GBAS integrity support alongside FDE is the broader, more complete approach; the idea that GNSS integrity cannot be monitored is incorrect.

Beyond internal consistency checks like RAIM, modern receivers rely on two additional mechanisms to ensure GNSS integrity: fault detection/exclusion and augmentation systems such as SBAS and GBAS. RAIM tests the measurements to see if a subset of satellites yields a coherent solution, but it doesn’t identify which satellite is faulty or provide external integrity data. Fault Detection/Exclusion explicitly detects faults and can exclude the offending satellite to maintain a reliable solution.augmentation systems take integrity a step further by delivering external integrity information and corrections: SBAS provides wide-area integrity messages and corrections, helping the receiver compute protection levels and issue alerts when needed, while GBAS offers localized, airport-area integrity and corrections to support precision approaches. Together, these mechanisms extend integrity monitoring beyond what RAIM alone can offer. Ground-based augmentation exists, but SBAS/GBAS integrity support alongside FDE is the broader, more complete approach; the idea that GNSS integrity cannot be monitored is incorrect.