Flight Management System (FMS) navigation is sometimes disturbed by certain events in the form of (un)intentional jamming and spoofing of Global Navigation Satellite System (GNSS) signals. Often through Radio Frequency Interference (RFI). Due to the growing use and dependence on GNSS in aviation a loss of navigation could be a safety issue. It is for that reason that it is needed to investigate if, and for what duration GNSS signal occurs in the Dutch flight region. The primary goal is knowing what the reliability of the GNSS signals is, as received and reported by the aircraft.
By the use of data analysis, the reliability can be tested. Messages are downlinked by aircraft using ADS-B or Mode-S links. Some of those messages contain data related to the GNSS quality, these are the so-called NIC/NAC values. This research aims to get a clear insight of the quality of the GNSS signals in the Dutch airspace.
Graduated: July 2025