What is RAIM and FDE mean in relation to GPS receivers?
In very general terms, RAIM (Receiver Autonomous Integrity Monitoring) and FDE (Fault Detection and Exclusion) are means to provide a GPS receiver with a cross check function and exclusion of an unreliable satellite for navigation purposes. In VOR navigation, there is a flag on most CDIs that will warn pilots when a VOR signal is not valid or not available. RAIM provides the means for the GPS receiver to indicate a problem with a satellite. FDE then checks each satellite against each other and exclude the failed satellite when a problem is detected. RAIM is always required in GPS receivers that are certified to TSO C129A or better. This certification, in most cases, allows the GPS receiver to be operated and utilized for IFR navigation. If a GPS receiver has the FDE feature, then, in most cases, it may be used as the sole navigation source in oceanic and remote flying operations. Information such as dates, times, route, waypoint, speed, etc is entered by the pilot into the GPS or FMS t
Answer In very general terms, RAIM (Receiver Autonomous Integrity Monitoring) and FDE (Fault Detection and Exclusion) are means to provide a GPS receiver with a cross check function and exclusion of an unreliable satellite for navigation purposes. In VOR navigation, there is a flag on most CDIs that will warn pilots when a VOR signal is not valid or not available. RAIM provides the means for the GPS receiver to indicate a problem with a satellite. FDE then checks each satellite against each other and exclude the failed satellite when a problem is detected. RAIM is always required in GPS receivers that are certified to TSO C129A or better. This certification, in most cases, allows the GPS receiver to be operated and utilized for IFR navigation. If a GPS receiver has the FDE feature, then, in most cases, it may be used as the sole navigation source in oceanic and remote flying operations. Information such as dates, times, route, waypoint, speed, etc is entered by the pilot into the GPS o
