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METHOD AND DEVICE FOR GENERATING A YAW SPEED ORDER FOR AN AIRCRAFT DURING A TAXIING

  • US 20090150010A1
  • Filed: 12/08/2008
  • Published: 06/11/2009
  • Est. Priority Date: 12/11/2007
  • Status: Active Grant
First Claim
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1. A method of generating a yaw rate command for an aircraft (A) rolling on the ground along a trajectory (TR), according to which method the following successive steps are carried out in a repetitive and automatic manner:

  • a) the current position, the current heading, the current lateral speed, and the current longitudinal speed of said aircraft (A) are measured;

    b) a current curvature at a current target point (H) of the trajectory (TR) is determined on the basis of said trajectory (TR) and of said measured current position;

    c) a current lateral deviation (yc) is determined on the basis of said trajectory (TR) and of said measured current position;

    d) a current angular deviation (ψ

    c) is determined on the basis of said trajectory (TR) and of said measured current heading; and

    e) a yaw rate which represents said yaw rate command allowing the aircraft (A) to follow said trajectory (TR) is calculated on the basis of said measured current lateral and longitudinal speeds, as well as on the basis of said current curvature, of said current lateral deviation (yc) and of said current angular deviation (ψ

    c),wherein in step e), said yaw rate command rc is calculated with the aid of the following expression;


    rc=(tgβ

    ·

    Vx−

    Vy
    )/LRA in which;

    Vx is the measured current longitudinal speed of the aircraft (A);

    Vy is the measured current lateral speed of the aircraft (A);

    LRA is a parameter illustrating the longitudinal wheelbase of the aircraft (A); and

    β

    is an angular parameter.

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