Method and device for generating a resulting setpoint trajectory of an aircraft, related computer program product and aircraft

A method for generating a resulting setpoint trajectory of an aircraft, intended for at least one receiving system from among at least a guiding system of the aircraft, the resulting setpoint trajectory including at least one trajectory segment for at least one axis from among a lateral axis, a vertical axis and a longitudinal axis associated with the aircraft, the guiding system being configured to control the trajectory of the aircraft relative to said resulting setpoint trajectory,

• the aircraft comprising an electronic generating devices for generating said setpoint trajectory, a flight management system and the guiding system, the generating device (comprising a trajectory computing module,
• the method being implemented by a said generating device and comprising:
• selecting at least one operating mode from among a plurality of operating modes,
• acquiring a setpoint trajectory prepared by the flight management system, the prepared setpoint trajectory including one or several trajectory segments for at least one axis among the lateral axis, the vertical axis and the longitudinal axis,
• obtaining an alternative setpoint trajectory from an element among the trajectory computing module and an external system for generating a setpoint trajectory, said external generating system being separate from the flight management system, the alternative setpoint trajectory including one or several trajectory segments for at least one axis among the lateral axis), the vertical axis and the longitudinal axis, and
• generating the resulting setpoint trajectory, the resulting setpoint trajectory including the segment(s) of the prepared setpoint trajectory acquired for the period of time corresponding to the selection of a first operating mode, and the segment(s) of the alternative setpoint trajectory obtained for the period of time corresponding to the selection of another operating mode.