US Patent 7330781 Method to determine and guide aircraft approach trajectory

A method to determine, and guide an aircraft on, an intermediate trajectory between a first trajectory, for low-altitude flight, and a second trajectory, from which a tactical landing is carried out, may include determining a point of transition which lies on the first trajectory. The point of transition represents the start of the intermediate trajectory and corresponds to the point where the aircraft must exit the first flight trajectory so as to reach an initial point of the second flight trajectory, under predetermined flight conditions. Upon determining the point of transition, the aircraft is guided along the intermediate trajectory interconnecting the point of transition and the initial point of the second trajectory.