Method and apparatus for determining a route and correction values for heuristic values
First Claim
1. A method for determining a route for at least one of a navigation system and a driver assistance system with an associated storage unit in a vehicle for storing digital map data for at least one of a route network and a path network in a predefined area, the digital map data comprising:
- respective nodes in the predefined area and connections between the respective nodes in the predefined area,respective edge costs for the respective connections between the nodes, andpredefined correction values for the respective nodes,wherein the method comprises the acts of;
determining, by an apparatus including a processor programmed to determine the route, the route from a predefined starting node to a predefined destination node on the basis of the digital map data stored in the storage unit wherein, for a possible expansion of a respective current node, total costs are determined for the current node based on;
(i) a sum of edge costs (g) of an optimum route from the starting node to the current node and a destination-node-based heuristic value (h) for the current node, which represents respectively estimated costs from the current node to the destination node, and(ii) a predefined destination-node-based correction value (k) which is representative of a mean value of cost ratios (Cost) of respective nodes in a predefined set, wherein the respective cost ratios (Cost) are dependent on;
the edge costs of the connections, which lie between the current node and the respective node in the set and represent an optimum route between the current node and the respective node in the set, anda heuristic value for the current node with respect to the respective node in the set; and
forwarding the determined route to the at least one of the navigation system and the driver assistance system for at least one of indicating the determined route and controlling the vehicle.
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Abstract
The route from a prescribed starting node to a prescribed destination node is determined on the basis of digital map data stored in a memory unit such that, for possible expansion of a respective current node, total costs are determined for the current node on the basis of a sum of edge costs for an optimum route from the starting node to the current node and a destination-node-related heuristic value for the current node and a prescribed destination-node-related correction value. The destination-node-related correction value is in this case representative of a mean value for cost ratios for respective nodes in a prescribed set, wherein the respective cost ratios are dependent on the edge costs of the connections that are situated between the current node and the respective node in the set and that represent an optimum route between the current node and this node in the set and on a heuristic value for the current node in relation to this node in the set.
18 Citations
20 Claims
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1. A method for determining a route for at least one of a navigation system and a driver assistance system with an associated storage unit in a vehicle for storing digital map data for at least one of a route network and a path network in a predefined area, the digital map data comprising:
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respective nodes in the predefined area and connections between the respective nodes in the predefined area, respective edge costs for the respective connections between the nodes, and predefined correction values for the respective nodes, wherein the method comprises the acts of; determining, by an apparatus including a processor programmed to determine the route, the route from a predefined starting node to a predefined destination node on the basis of the digital map data stored in the storage unit wherein, for a possible expansion of a respective current node, total costs are determined for the current node based on; (i) a sum of edge costs (g) of an optimum route from the starting node to the current node and a destination-node-based heuristic value (h) for the current node, which represents respectively estimated costs from the current node to the destination node, and (ii) a predefined destination-node-based correction value (k) which is representative of a mean value of cost ratios (Cost) of respective nodes in a predefined set, wherein the respective cost ratios (Cost) are dependent on; the edge costs of the connections, which lie between the current node and the respective node in the set and represent an optimum route between the current node and the respective node in the set, and a heuristic value for the current node with respect to the respective node in the set; and forwarding the determined route to the at least one of the navigation system and the driver assistance system for at least one of indicating the determined route and controlling the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining correction values for a route calculation algorithm based on digital map data for at least one of a route network and a path network in a predefined area, the digital map data comprising:
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respective nodes in the predefined area and connections between the respective nodes in the predefined area, and respective edge costs for the respective connections between the nodes, the method comprising the acts of; predefining, by an apparatus including a processor programmed to determine a route, at least one reference set of nodes for at least some of the nodes in the predefined area for the respective node, and for the at least one predefined reference set of nodes; determining, by the apparatus including the processor programmed to determine the route, a cost ratio for the respective node in the reference set based on; the edge costs of the connections, which lie between the node, for which a correction value is determined, and the respective node in the reference set and represent an optimum route between the node, for which the correction value is determined, and the node in the reference set, and a heuristic value for the node, for which the correction value is determined, with respect to the node in the reference set, determining, by the apparatus including the processor programmed to determine the route, a mean value based on the determined cost ratios of the nodes in the reference set, and determining, by the apparatus including the processor programmed to determine the route a correction value based on the mean value. - View Dependent Claims (11, 12, 13, 14, 15)
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16. An apparatus for determining a route for at least one of a navigation system and a driver assistance system with an associated storage unit for storing digital map data for at least one of a route network and a path network in a predefined area, the digital map data comprising:
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respective nodes in the predefined area and connections between the respective nodes in the predefined area, respective edge costs for the respective connections between the nodes, and predefined correction values for the respective nodes, wherein the apparatus comprises a processor that executes a program to; determine the route from a predefined starting node to a predefined destination node on the basis of the digital map data stored in the storage unit such that, for a possible expansion of a respective current node, total costs are determined for the current node based on; (i) a sum of edge costs (g) of an optimum route from the starting node to the current node and a destination-node-based heuristic value (h) for the current node, which represents respectively estimated costs from the current node to the destination node, and (ii) a predefined destination-node-based correction value (k) which is representative of a mean value of cost ratios (Cost) of respective nodes in a predefined set, wherein the respective cost ratios (Cost) are dependent on; the edge costs of the connections, which lie between the current node and the respective node in the set and represent an optimum route between the current node and the respective node in the set, and a heuristic value for the current node with respect to the respective node in the set.
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17. A system, comprising:
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a storage unit that stores digital map data for at least one of a route network and a path network in a predefined area, the digital map data comprising; respective nodes in the predefined area and connections between the respective nodes in the predefined area, respective edge costs for the respective connections between the nodes, and predefined correction values for the respective nodes; an apparatus for determining a route, the apparatus being coupled with the storage unit and being configured to read the digital map data from the storage unit, wherein the apparatus comprises; a processor that executes program code to; determine the route from a predefined starting node to a predefined destination node on the basis of the digital map data stored in the storage unit such that, for a possible expansion of a respective current node, total costs are determined for the current node based on; (i) a sum of edge costs (g) of an optimum route from the starting node to the current node and a destination-node-based heuristic value (h) for the current node, which represents respectively estimated costs from the current node to the destination node, and (ii) a predefined destination-node-based correction value (k) which is representative of a mean value of cost ratios (Cost) of respective nodes in a predefined set, wherein the respective cost ratios (Cost) are dependent on the edge costs of the connections, which lie between the current node and the respective node in the set and represent an optimum route between the current node and the respective node in the set, and a heuristic value for the current node with respect to the respective node in the set. - View Dependent Claims (18, 19, 20)
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Specification