Method of guidance for aircraft trajectory correction

摘要

Guidance for an aircraft correcting a trajectory deviation due to wind computes a roll command during trajectory alignment according to imposed alignment passing through a determined point, via a current angular divergence between a line through the point and aircraft and direction of alignment and of a current estimated ground speed of the aircraft with respect to a frame of reference. The current estimated ground speed is computed via a current air speed and stored wind speed. The stored wind speed is obtained via at least one wind speed computed via a first value of a first speed equal to the speed of the said aircraft with respect to a frame of reference originating from a satellite navigation system and a second value of a second speed equal to the air speed. The first and second value are simultaneously accounted earlier than or at the instant at the alignment phase.

主权项

1. A guidance method of an aircraft for correcting a trajectory deviation due to a presence of wind during a phase of alignment of a trajectory according to an imposed direction of alignment passing through a determined point comprising the steps of:
determining an instant at which the aircraft starts the alignment phase with a guidance system; determining a stored wind speed on a basis of at least one wind speed computed by the guidance system on the basis:
of a first value of a first speed equal to a speed of the aircraft with respect to a frame of reference tied to the ground originating from a satellite navigation system, andof a second value of a second speed equal to the air speed with respect to the surrounding air,wherein the first and second values being taken into account simultaneously at at least one instant earlier than or equal to the instant at which the aircraft starts the alignment phase, loading a current air speed of the aircraft with respect to the surrounding air to the guidance system; determining a current estimated ground speed of the aircraft with respect to a frame of reference tied to the ground on the basis of the current air speed and of the determined stored wind speed with the guidance system; loading a current angular divergence to the guidance system between a straight line passing through the determined point and the aircraft on the one hand and the direction of alignment on the other hand; and computing a roll command of the aircraft with the guidance system during said phase of alignment on the basis of said current angular divergence and said current estimated ground speed, the computing of the roll command being thus performed without using the satellite navigation system during the alignment phase for determining a current ground speed.