Method and device for automatic protection of an aircraft against a risk of collision with the ground

摘要

A protection device including a unit for implementing a protection function that prevents the aircraft from flying under a given height with respect to the ground. The device includes a unit for determining the current values of parameters, and at least the current position of the aircraft and a current heading deviation of the aircraft with respect to a landing strip. A calculation unit is provided for calculating, during a landing on the landing strip, from data including said current values, a current longitudinal distance defined in the horizontal plane and necessary for bringing the aircraft into a position for deactivating the protection function. A checking unit is provided for checking whether a condition dependent on the current longitudinal distance is met, the protection function being automatically deactivated if the checking unit concludes that this condition is met.

主权项

1. A method of automatic protection of an aircraft against a risk of collision with the ground, comprising the steps:
implementing on the aircraft at least one protection function, said protection function preventing the aircraft from flying under a given height with respect to the ground, said protection function being capable of being activated and deactivated, automatically and repetitively, during a landing on a landing strip, at least when the protection function is activated, performing the following successive steps: determining a plurality of data including the current values of parameters related to the flight of the aircraft, namely at least the current position of the aircraft and a current heading deviation of the aircraft with respect to the landing strip, as well as at least one target point; calculating, from some of these data, a current longitudinal distance, this current longitudinal distance being defined in the horizontal plane and being necessary and sufficient for bringing the aircraft into a position for deactivating the protection function; and checking whether at least the following first condition is met:
XAC+D4·sign(cos(Δχ))_>_XTGT in which:
XAC illustrates a longitudinal coordinate of the current position of the aircraft, this longitudinal coordinate having a negative value and being defined along a longitudinal axis of the landing strip in the horizontal plane, with respect to a reference point; sign represents the sign; D4 is the current longitudinal distance, Δχ is the current heading deviation of the aircraft with respect to the landing strip; and XTGT is a longitudinal coordinate of a target position dependent on said target point, said method including an additional step comprising deactivating the protection function if at least said first condition is met.