Patent ID: 8355861

Claim:
A method to carry out in a computer for automatically determining an avoidance manoeuvre in an automatic collision avoidance system of an aircraft, the method comprising: determining, by said computer, a maximum kinematic acceleration envelope for a number of avoidance manoeuvre angles by determining a corresponding number of corresponding kinematic accelerations in a kinematic acceleration plane, hereby defining a number of points, and interpolating the gaps between the points, thus creating the maximum kinematic acceleration envelope; forming, by said computer, an adjusted kinematic acceleration envelope in said aircraft by forming a new envelope, the new envelope at each point laying closer to or at the same distance from the origin as the points of the maximum kinematic acceleration envelope and such that for a given avoidance manoeuvre angle (ε), there is one value of the kinematic acceleration (a); receiving, by said computer, a desired avoidance manoeuvre angle (ε); determining, by said computer, the magnitude of the kinematic acceleration (a) corresponding to the adjusted kinematic acceleration envelope for the avoidance manoeuvre angle (ε), by reading the adjusted envelope curve; determining, by said computer, a normal load (n z ), and a bank angle (φ) based on the kinematic acceleration (a), and the avoidance manoeuvre angle (ε); and guiding the aircraft in accordance with the generated avoidance manoeuver.