Abstract: The invention is situated in the field of displaying on board an aircraft geostationary elements of the navigation database on a screen having different display resolutions for the purpose of this data display, and its subject is a method for simplifying the display of stationary elements of this onboard database. This method is characterized in that it consists in precalculating a “decluttering” during the process of producing the onboard database by meshing the Earth with a Cartesian grid oriented along the latitudes and longitudes of the Earth, and by allowing only the most pertinent obstacle to appear in each rectangle of this grid.

Abstract: This building method concerns building of at least one aircraft guideline in an airport navigation network. The navigation network includes a plurality of polygons and is associated with an airport area including taxiways, each guideline connecting two distinct sides of a corresponding polygon, the navigation network being configured to be stored in a memory of a computer system. The method is implemented by a computer and includes the following steps creating nodes at each intersection between an existing guideline and a side of a corresponding polygon, or at the middle of a side shared by two polygons when no guideline is secant with said side, detecting at least one pair of nodes not connected by a guideline, computing, for each detected pair of nodes, a guideline in the form of a polynomial curve, and storing the computed guidelines in the memory of the computer system.

Abstract: The invention is an automatic method making it possible to determine the characteristic points of a bridge as well as their correct ordering on the basis of an airport database, with a view to allowing the correct graphical representation of the said bridge on a digitized airport map. One of the main advantages of the invention resides in its automatic character.

Abstract: A navigation database comprises a first set of elements comprising airports, beacons and waypoints; a second set of elements comprising procedures; and a third set of elements comprising routes. The method comprises a step of creating a pair of indices comprising an index comprising the elements of the three sets; identifier, a type and a functional identifier; a first list of pointers to the memory address where the elements are stored; a pre-index comprising a list of code, each code corresponding to the first characters of each element, the codes being indexed by a family of attributes of elements; a second list of pointers to the identifier of the first element in the first index.

Abstract: A method and device checks the conformity of a trajectory calculated by a flight management system of an aircraft in relation to reference data comprising a reference map. The method includes: geo-referencing of a reference map; determination of a reference trajectory from the geo-referenced reference map; detection of nonconformity in the trajectory calculated by the flight management system by comparison of the trajectory calculated by the flight management system with the reference trajectory; and emission of a warning if a nonconformity is detected.

Abstract: A device for access to data by clients aboard an aircraft, each of the clients being associated with an avionics application. Each of the clients includes a facade allowing access by the avionics applications to the data stored on the server. The facade includes means for signing up of the avionics application associated with the client to a subscription to a modification of a data item, and means for filtering notifications of modifications on the data sent by the data server as a function of the subscriptions of the avionics application associated with the client, and for warning the avionics application associated with the client of a modification of a data item to which it has subscribed.

Abstract: A device for access to data by clients aboard an aircraft, each of the clients being associated with an avionics application. Each of the clients includes a facade allowing access by the avionics applications to the data stored on the server. The facade includes means for signing up of the avionics application associated with the client to a subscription to a modification of a data item, and means for filtering notifications of modifications on the data sent by the data server as a function of the subscriptions of the avionics application associated with the client, and for warning the avionics application associated with the client of a modification of a data item to which it has subscribed.

Abstract: A navigation database comprises a first set of elements comprising airports, beacons and waypoints; a second set of elements comprising procedures; and a third set of elements comprising routes. The method comprises a step of creating a pair of indices comprising an index comprising the elements of the three sets; identifier, a type and a functional identifier; a first list of pointers to the memory address where the elements are stored; a pre-index comprising a list of code, each code corresponding to the first characters of each element, the codes being indexed by a family of attributes of elements; a second list of pointers to the identifier of the first element in the first index.

Abstract: A method and device checks the conformity of a trajectory calculated by a flight management system of an aircraft in relation to reference data comprising a reference map. The method includes: geo-referencing of a reference map; determination of a reference trajectory from the geo-referenced reference map; detection of nonconformity in the trajectory calculated by the flight management system by comparison of the trajectory calculated by the flight management system with the reference trajectory; and emission of a warning if a nonconformity is detected.

Abstract: A display system includes information sources containing information relating to an aircraft and its surrounding environment. A processor constructs a three-dimensional synthesis image of the aircraft environment, using the information from the information sources, so as to display the position of the aircraft, the environment through which the aircraft is moving, and the terrain to be flown over. The synthesis image is coherent with information relating to another display. A display unit displays the synthesis image on one area of a display screen.

Abstract: A method for filtering anti-collision alarms for aircraft, the said aircraft comprising means for calculating its speed and extrapolated positions on its trajectory, the said extrapolated positions being calculated over a fixed maximum time period, called extrapolation time, and a topographical database of the terrain, the said database comprising, within a given perimeter, data on the density of obstacles, comprises a calculation of a weighting coefficient for the extrapolation time of the calculated extrapolated trajectories of the aircraft as a function of the density of obstacles within a surface area included within the perimeter.

Abstract: The invention is an automatic method making it possible to determine the characteristic points of a bridge as well as their correct ordering on the basis of an airport database, with a view to allowing the correct graphical representation of the said bridge on a digitized airport map. One of the main advantages of the invention resides in its automatic character.

Abstract: The invention is situated in the field of displaying on board an aircraft geostationary elements of the navigation database on a screen having different display resolutions for the purpose of this data display, and its subject is a method for simplifying the display of stationary elements of this onboard database. This method is characterized in that it consists in precalculating a “decluttering” during the process of producing the onboard database by meshing the Earth with a Cartesian grid oriented along the latitudes and longitudes of the Earth, and by allowing only the most pertinent obstacle to appear in each rectangle of this grid.

Abstract: A method for filtering anti-collision alarms for aircraft, the said aircraft comprising means for calculating its speed and extrapolated positions on its trajectory, the said extrapolated positions being calculated over a fixed maximum time period, called extrapolation time, and a topographical database of the terrain, the said database comprising, within a given perimeter, data on the density of obstacles, comprises a calculation of a weighting coefficient for the extrapolation time of the calculated extrapolated trajectories of the aircraft as a function of the density of obstacles within a surface area included within the perimeter.

Abstract: This method makes it possible to plot, from a terrain elevation database, a map of the distances of the points accessible to a moving object subject to constraints (inaccessible reliefs, unnegotiable obstacles, weather disturbances, path with an imposed vertical profile, etc.), the distances being measured only along paths that are practical for the moving object. It employs a chamfer distance transform applied to the image consisting of the projection on the horizontal plane of a 3D representation of the flying space of the moving object, which is likened to a mesh of elementary cubes associated with specific negotiation danger levels. It lists the typical paths without exceeding an acceptable danger threshold, going from a target point, the distance of which is to be estimated, to a source point, the origin of the distance measurements, and likens the distance of the target point to the length of the shortest practicable path or paths.

Abstract: The invention relates to an aircraft display system (1A). The inventive system consists of: a display device (2) comprising information sources (3) which contain information relating to the aircraft and the surrounding environment; information-processing means (4) which can construct an image of the aircraft environment using the information from the information sources (3) and which construct a three-dimensional synthesis image in order to display the position of the aircraft and the environment through which the aircraft is moving, including the terrain to be flown over, said synthesis image being coherent at least with information relating to another display, e.g. a two-dimensional display; and display means (6) which display the synthesis image on at least one area (9A) of a display screen (7).