| 摘要 |
A method of contributing to making safe a synthetic vision display of an aircraft for displaying on viewing means an at least partial view in perspective of the environment of the aircraft together with piloting symbology. During the method, at least one check point (P1, P2, P3) is defined that is situated in the environment and that co-operates with a reference point (Pr) of the aircraft to form a first straight line (DP). Thereafter, a first display function (F1) is used to calculate display coordinates (a1,b2), (a2,b2), (a3,b3) for each check point (P1, P2, P3) on the viewing means, and then the inverse (F2)−1 of a second display function (F2) is used together with the display coordinates (a1,b2), (a2,b2), (a3,b3) to calculate a second straight line (DS) passing through the reference point (Dr). Finally, the first and second lines (DP, DS) corresponding to a common check point (P1, P2, P3) are compared in order to define whether the synthetic vision display is trustworthy. |
| 主权项 |
1. A method of contributing to making safe a synthetic graphics representation of the view outside an aircraft, the aircraft having at least one viewing means on which it is possible to display firstly an at least partial view in perspective of the environment of the aircraft and secondly piloting symbology for the aircraft, a roll axis (X10) extending from the rear of the aircraft to the front of the aircraft, a yaw axis (Z10) extending upwards perpendicularly to the roll axis (X10), and a pitching axis (Y10) extending from right to left perpendicularly to the roll and yaw axes (X10, Z10), together forming a local reference frame (X10, Y10, Z10) tied to the aircraft,
the method including the following steps:
determining at least the heading and the attitude of the aircraft and determining a reference point (Pr) of the aircraft;defining at least one check point (P1, P2, P3) situated in the environment of the aircraft, each check point (P1, P2, P3) co-operating with the reference point Pr to form a respective first straight line (DP1, DP2, DP3), the position of each first line (DP1, DP2, DP3) being known in the local reference frame (X10, Y10, Z10) tied to the aircraft;using a first display function (F1) to calculate the display coordinates (a1, b1), (a2,b2), (a3,b3) of each check point (P1, P2, P3) on the viewing means;using the inverse (F2)−1 of a second display function (F2) together with the display coordinates (a1, b1), (a2,b2), (a3,b3) to calculate a second straight line (DS1, DS2, DS3) for each check point (P1, P2, P3), each second line (DS1, DS2, DS3) passing through the reference point (Pr) of the aircraft, the first display function (F1) and the second display function (F2) being distinct;comparing each first line (DP1, DP2, DP3) with each second line (DS1, DS2, DS3) corresponding to the same check point (P1, P2, P3); anddefining that the at least partial view in perspective of the environment of the aircraft is trustworthy if each first line (DP1, DP2, DP3) and each second line (DS1, DS2, DS3) corresponding to the same check point (P1, P2, P3) presents an angular difference that is less than or equal to a predetermined margin. |
