RAIM accuracy limit for the Terminal phase is closest to what value?

RAIM accuracy limit for the Terminal phase is closest to what value?

• A. 2.0 NM
• B. 1.0 NM
• C. 0.3 NM
• D. 5.0 NM

Answer: (B)

RAIM accuracy limit tells you the maximum lateral error you can trust from the GPS solution during the terminal phase of flight. In the terminal segment, typical RAIM performance is evaluated with an accuracy limit around 1 nautical mile. This level reflects the balance between satellite geometry, receiver algorithms, and the need for reliable position information when you're near the runway and making approaches. Why this value fits best: 1.0 NM represents a practical, safety-oriented bound for terminal operations, where you need reasonably precise position information to align with the final approach path and maintain obstacle clearance, while still accounting for normal GNSS errors and integrity checks. Why the other options don’t fit as well: 0.3 NM would demand unrealistically tight accuracy given usual GNSS errors and RAIM performance in the terminal area. 2.0 NM or 5.0 NM would be looser than typical terminal requirements and could undermine the safety margins needed near approach and landing.

RAIM accuracy limit tells you the maximum lateral error you can trust from the GPS solution during the terminal phase of flight. In the terminal segment, typical RAIM performance is evaluated with an accuracy limit around 1 nautical mile. This level reflects the balance between satellite geometry, receiver algorithms, and the need for reliable position information when you're near the runway and making approaches.

Why this value fits best: 1.0 NM represents a practical, safety-oriented bound for terminal operations, where you need reasonably precise position information to align with the final approach path and maintain obstacle clearance, while still accounting for normal GNSS errors and integrity checks.

Why the other options don’t fit as well: 0.3 NM would demand unrealistically tight accuracy given usual GNSS errors and RAIM performance in the terminal area. 2.0 NM or 5.0 NM would be looser than typical terminal requirements and could undermine the safety margins needed near approach and landing.