Aircraft piloting aid system using a head-up display
First Claim
1. A system for aiding piloting of an aircraft, comprising:
- a head-up display (HUD);
a computer (HUDC) associated with the head-up display, the computer comprising means for controlling the head-up display to display an aircraft attitude symbol;
a non-inertial attitude and heading unit (AHRS) configured to supply heading, attitude, acceleration and vertical velocity information to the computer;
a plurality of satellite positioning receivers having antennas substantially aligned with a principal axis of the aircraft, the receivers supplying signals to the computer; and
means for contrasting measurements supplied by the receivers to establish aircraft heading and attitude information based upon phase comparisons of signals received by the receivers from a common satellite,wherein the computer further comprises means for computing an average of deviations between the attitude and heading information calculated from the signals of the satellite positioning receivers and the attitude and heading information supplied by the AHRS unit, and means for correcting, on the basis of the computed average of the deviations, the heading and attitude information supplied by the AHRS unit, the head-up display displaying symbols based upon the corrected heading and attitude information.
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Accused Products
Abstract
The 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.
50 Citations
15 Claims
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1. A system for aiding piloting of an aircraft, comprising:
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a head-up display (HUD); a computer (HUDC) associated with the head-up display, the computer comprising means for controlling the head-up display to display an aircraft attitude symbol; a non-inertial attitude and heading unit (AHRS) configured to supply heading, attitude, acceleration and vertical velocity information to the computer; a plurality of satellite positioning receivers having antennas substantially aligned with a principal axis of the aircraft, the receivers supplying signals to the computer; and means for contrasting measurements supplied by the receivers to establish aircraft heading and attitude information based upon phase comparisons of signals received by the receivers from a common satellite, wherein the computer further comprises means for computing an average of deviations between the attitude and heading information calculated from the signals of the satellite positioning receivers and the attitude and heading information supplied by the AHRS unit, and means for correcting, on the basis of the computed average of the deviations, the heading and attitude information supplied by the AHRS unit, the head-up display displaying symbols based upon the corrected heading and attitude information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification