What does FDE stand for and what is its purpose?

What does FDE stand for and what is its purpose?

• A. Fault Detection/Exclusion; detects and excludes GNSS faults to maintain integrity.
• B. Flight Data Encryption.
• C. Frequency Domain Evaluation.
• D. Fault Diagnostics Engine.

Answer: (A)

Fault Detection and Exclusion means a GNSS integrity feature that spots bad measurements and removes them from the navigation solution. The idea is to keep the position, velocity, and timing data trustworthy by continuously monitoring satellite signals and comparing measurements for consistency. When a fault is detected—such as an anomalous pseudorange or carrier measurement, or a satellite that's not contributing reliably—the offending data are excluded from the solution, often keeping the rest of the satellites to maintain the required integrity level. This prevents faulty signals from degrading accuracy and is crucial for safe aviation operations that depend on GNSS. The other terms don’t describe this specific safety function: Flight Data Encryption is about securing data, Frequency Domain Evaluation is a broader signal-processing concept, and a Fault Diagnostics Engine isn’t the standard term used for maintaining GNSS integrity through fault exclusion.

Fault Detection and Exclusion means a GNSS integrity feature that spots bad measurements and removes them from the navigation solution. The idea is to keep the position, velocity, and timing data trustworthy by continuously monitoring satellite signals and comparing measurements for consistency. When a fault is detected—such as an anomalous pseudorange or carrier measurement, or a satellite that's not contributing reliably—the offending data are excluded from the solution, often keeping the rest of the satellites to maintain the required integrity level. This prevents faulty signals from degrading accuracy and is crucial for safe aviation operations that depend on GNSS. The other terms don’t describe this specific safety function: Flight Data Encryption is about securing data, Frequency Domain Evaluation is a broader signal-processing concept, and a Fault Diagnostics Engine isn’t the standard term used for maintaining GNSS integrity through fault exclusion.