AIRCRAFT PILOTING AID SYSTEM USING A HEAD-UP DISPLAY

摘要

An aircraft piloting aid system mainly used during take-off and landing under adverse visibility conditions is disclosed. To make use of head-up displays which display artificial horizon line, aircraft pitch attitude and ground speed vector symbols without using an inertial reference system (IRS) to provide heading and attitude data, a non-inertial attitude heading reference system (AHRS) combined with a compass is used and data therefrom is periodically corrected in order to display attitude symbols by means of corrected data rather than raw data from the AHRS. Correction is provided by two GPS receivers (GPS1, GPS2) connected to antennas (A1, A2) on top of the aircraft, and an interferometric RF carrier phase measurement is performed to determine an aircraft direction vector. The system is useful for modernising aircraft fitted with non-inertial AHRSs to enable take-off and landing under all conditions, including conditions of very poor visibility.