Instrument Rating Exam · Practice

How does FDE (Fault Detection and Exclusion) differ from basic RAIM in a GNSS receiver?

• A.FDE provides a more accurate position by averaging additional satellites, whereas basic RAIM uses only the minimum
• B.FDE monitors vertical (glideslope) signal integrity while RAIM monitors lateral integrity only
• C.FDE stands for Frequency Deviation Elimination and corrects ionospheric errors
• D.FDE detects a faulty satellite AND excludes it so the approach can continue; basic RAIM only detects the fault and alerts the pilot