The method uses a fleet of aircraft being equipped with at least one radar sensor, it includes at least: a step of collective collection of radar images by a set of aircraft (A1, . . . AN) of the fleet, the radar images being obtained by the radar sensors of the aircraft (A1, . . . AN) in nominal landing phases on the runway, a step wherein each image collected by an aircraft is labelled with at least information on the position of the runway relative to the aircraft, the labelled image being sent to a shared database and stored in the database; a step of learning by a neural network of the runway from the labelled images stored in the shared database, at the end of the step the neural network being trained; a step of sending of the trained neural network to at least one of the aircraft (A1).