| 摘要 |
PCT No. PCT/FR97/00058 Sec. 371 Date Jul. 20, 1998 Sec. 102(e) Date Jul. 20, 1998 PCT Filed Jan. 14, 1997 PCT Pub. No. WO97/26553 PCT Pub. Date Jul. 24, 1997The invention relates to systems for aiding the piloting of aircraft, mainly for take-off and landing under poor conditions of visibility. In order to benefit from the contribution of head-up displays, which exhibit symbols for the artificial horizon line, aircraft longitudinal attitude and ground speed vector, without using an IRS inertial unit to supply the heading and attitude information, it is proposed to use a non-inertial AHRS unit associated with a compass, and periodically to correct the information which it supplies, in order to exhibit the attitude symbols with the aid of the corrected information rather than the raw information from the AHRS unit. The correction is given by two GPS receivers (GPS1, GPS2) associated with antennas (A1, A2) on the top of the aircraft, an interferometric measurement of radiofrequency carrier phase being made to determine a direction vector of the aircraft. Application to the modernisation of aircraft equipped with non-inertial AHRS units so as to allow landings and take-offs in all conditions, including conditions of very poor visibility. |
