Abstract: A navigation aid method to determine an improved trajectory between points of departure and arrival as a function of a trajectory cost, comprises: determining a grid of nodes, loading meteorological data at the nodes, determining for each node, an average instantaneous cost from a first instantaneous cost as a function of a ground speed taking into account meteorological data loaded at the node concerned, and from a second instantaneous cost as a function of a ground speed that does not take into account the loaded meteorological data, determining a length of a trajectory passing through the node and arriving at the point of arrival, determining a cost grid assigning, at each of the nodes of the grid, a local cost determined from the average instantaneous cost and the length, determining an improved trajectory from the cost grid, and graphically representing the improved trajectory and/or the cost grid to a crew.

Abstract: A method for computing a setpoint trajectory of an aircraft comprising at least two subsets comprises the formulation and the solving of an optimization problem for the trajectory, and the formulation of the problem comprises at least the formulation of a constraint related to a transition of legs on at least one first subset of the trajectory, and the formulation of a constraint related to a transition of vertical flight phases on at least one second subset of the trajectory. The invention also relates to a system and a computer program for the computation of a trajectory.

Abstract: A navigation aid method to determine an improved trajectory between points of departure and arrival as a function of a trajectory cost, comprises: determining a grid of nodes, loading meteorological data at the nodes, determining for each node, an average instantaneous cost from a first instantaneous cost as a function of a ground speed taking into account meteorological data loaded at the node concerned, and from a second instantaneous cost as a function of a ground speed that does not take into account the loaded meteorological data, determining a length of a trajectory passing through the node and arriving at the point of arrival, determining a cost grid assigning, at each of the nodes of the grid, a local cost determined from the average instantaneous cost and the length, determining an improved trajectory from the cost grid, and graphically representing the improved trajectory and/or the cost grid to a crew.

Abstract: The present invention relates to a method for computing a setpoint trajectory of an aircraft comprising at least two subsets. It is characterized in that it comprises the formulation and the solving of an optimization problem for the trajectory, and that the formulation of the said problem comprises at least the formulation of a constraint related to a transition of legs on at least one first subset of the trajectory, and the formulation of a constraint related to a transition of vertical flight phases on at least one second subset of the trajectory. The invention also relates to a system and a computer program for the computation of a trajectory.

Abstract: A computer equipment comprises a trackball used to point to objects on a screen of the equipment. A method for driving the computer equipment is also provided. The trackball comprises a moving part and a body inside which the moving part can be displaced, the computer being configured to display at least one object and a pointer on the screen. The trackball comprises means making it possible to exert a tangential force on the moving part, means driven by the computer. The computer is configured to modulate the force according to the shape of the object displayed and the position of the pointer relative to the object.

Abstract: A method implemented by computer for optimizing the cruising trajectory of an aircraft comprises the steps consisting in receiving the parameters of a reference trajectory, the trajectory comprising one or more plateaus and the transitions between these plateaus, the transitions being ascending or descending; and determining, in response to a request received in the course of the flight, at least one candidate alternative trajectory; and determining one or more indicators associated with the candidate alternative trajectory such as determined. Developments comprise the optional display of at least one indicator, indicators associated with the fuel consumption, with a difference in flight time or with the operational cost of the flight of the aircraft, the use of ratios of indicators, the inhibition of descending transitions, particular plateau length transitions as well as economical modes of transition. System aspects are described, comprising avionic or non-avionic means.