Method and device for calculating a conjugated airport navigation graph, related method and system for generating a taxi routing of an aircraft, related computer program product

1. A method for generating a taxi trajectory of an aircraft in an airport domain,

the method being implemented by a computer and comprising:

acquiring a clearance including a sequence of elements of the airport domain that the aircraft must successively follow, and

generating the taxi trajectory of the aircraft in the airport domain as a function of the acquired clearance,

wherein the taxi trajectory of the aircraft is generated from a conjugated airport navigation graph from an initial airport navigation graph corresponding to an airport navigation network by,

(1) acquiring the initial airport navigation graph, said initial graph including a plurality of navigation arcs, each navigation arc including two end nodes, having at least one authorized navigation direction and being identified by its two end nodes,

(2) determining a conjugated node for each navigation arc and for each authorized navigation direction of said arc, each conjugated node corresponding to a single authorized navigation direction and representing said arc of the initial graph associated with said authorized navigation direction, and

(3) computing the conjugated graph, the conjugated graph including conjugated nodes which are connected depending on the connections between the arcs of the initial graph and the authorized navigation directions, two conjugated nodes being connected to one another when they correspond to two successive arcs of the initial graph and to a same authorized navigation direction.

2. The method according to claim 1 , wherein the method further comprises the classification of the determined conjugated nodes into first and second distinct subsets, the first subset including the conjugated node(s) corresponding to navigable arcs for any clearance and the second subset including the conjugated node(s) corresponding to navigable arcs only for one or more clearances, each clearance including a sequence of elements of the airport domain that a respective aircraft must successively follow during taxiing.

3. The method according to claim 2 , wherein the second subset includes one or more conjugated nodes corresponding to arcs associated with runway crossings of the airport domain.

4. The method according to claim 2 , wherein the second subset includes one or more conjugated nodes corresponding to arcs associated with parking areas of the airport domain.

5. The method according to claim 1 , wherein the method comprises acquiring a minimum curve radius corresponding to the maximum steering of a considered aircraft, and

during computing the conjugated graph, two conjugated nodes are connected to one another only when two successive arcs of the initial graph, identified by said conjugated nodes, form a curve radius between them higher than the minimum curve radius.

6. The method according to claim 1 , wherein the method comprises acquiring at least one dimension relative to the bulk of a considered aircraft, and

during determining the conjugated nodes, a conjugated node is determined for a respective arc of the initial graph only if said arc is compatible with each required dimension.

7. The method according to claim 1 , wherein the method comprises acquiring the mass of the considered aircraft, and

during determining the conjugated nodes, a conjugated node is determined for a respective arc of the initial graph only if said arc is compatible with the acquired mass.

8. The method according to claim 1 , wherein computing the conjugated graph includes deleting a node conjugated with a single preceding conjugated node and a single following conjugated node, the preceding conjugated node and the following conjugated node then being directly connected to one another.

9. A non-transitory computer-readable medium including a computer program product including software instructions which, when implemented by a computer, implement a method according to claim 1 .

10. An electronic system for generating a taxi trajectory of an aircraft in an airport domain, the system comprising:

a device for acquiring a clearance, the clearance including a series of elements of the airport domain that the aircraft must successively follow;

a device for generating the taxi trajectory of the aircraft in the airport domain as a function of the acquired clearance, the generating device being configured to generate the taxi trajectory of the aircraft from a conjugated airport navigation graph; and

an electronic device for computing the conjugated airport navigation graph from an initial airport navigation graph corresponding to an airport navigation network, the airport navigation network being associated with the airport domain,

the electronic device further comprising:

a module for acquiring the initial airport navigation graph, said initial graph including a plurality of navigation arcs, each navigation arc including two end nodes, having at least one authorized navigation direction and being identified by its two end nodes;

a module for determining a conjugated node for each navigation arc and for each authorized navigation direction of said arc, each conjugated node corresponding to a single authorized navigation direction and representing said arc of the initial graph associated with said authorized navigation direction; and

a module for computing the conjugated graph, the computing module being configured to create the conjugated graph by including conjugated nodes which are connected depending on the connections between the arcs of the initial graph and the authorized navigation directions, two conjugated nodes being connected to one another when they correspond to two successive arcs of the initial graph and to a same authorized navigation direction.