Method of estimation of traffic information, device of estimation of traffic information and car navigation device
First Claim
1. A navigation device, comprising:
- an intersection retrieving section for retrieving an intersection connected with a road to which traffic information is added and another road to which no traffic information is added;
a complement originator retrieving section for tracking a road connected to the intersection retrieved by the intersection retrieving section and for which traffic information is added up to a predetermined distance to specify the road within the tracked range as a complement originator of traffic information;
a complement object retrieving section for tracking a road connected to the intersection retrieved by the intersection retrieving section and for which no traffic information is added up to a predetermined distance to specify the road within the tracked range as a complement object of traffic information; and
a traffic information complementing section for complementing traffic information to the complement object specified by the complement object retrieving section based on the traffic information added to the complement originator specified by the complement originator retrieving section.
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Accused Products
Abstract
There is provided a method and a device for accurately estimating traffic information of a link having no traffic information even if different types of roads are mixed. The device finds a parameter characterizing a damping curve of a quantity of change of relative speed based on stored traffic information for links on a city center side on a minimum-time cost route connecting the city center and suburbs, finds a quantity of change of relative speed of the link having no observed traffic information and estimates its traffic information based on the damping curve. The device also calculates a ratio of quantities of change of relative speed of two links whose road types change as a speed change similarity ratio and estimates traffic information of the link of a second road type from known traffic information of the link of a first road type by using that ratio.
22 Citations
6 Claims
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1. A navigation device, comprising:
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an intersection retrieving section for retrieving an intersection connected with a road to which traffic information is added and another road to which no traffic information is added; a complement originator retrieving section for tracking a road connected to the intersection retrieved by the intersection retrieving section and for which traffic information is added up to a predetermined distance to specify the road within the tracked range as a complement originator of traffic information; a complement object retrieving section for tracking a road connected to the intersection retrieved by the intersection retrieving section and for which no traffic information is added up to a predetermined distance to specify the road within the tracked range as a complement object of traffic information; and a traffic information complementing section for complementing traffic information to the complement object specified by the complement object retrieving section based on the traffic information added to the complement originator specified by the complement originator retrieving section. - View Dependent Claims (2, 3, 4, 5)
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6. A traffic information estimating method of a navigation device, comprising steps of:
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retrieving an intersection connected with a road to which traffic information is added and a road to which no traffic information is added; tracking the road connected to the intersection retrieved in the intersection retrieving step and to which traffic information is added up to a predetermined distance to specify the road within the tracked range as a complement originator of traffic information; tracking a road connected to the intersection retrieved in the intersection retrieving step and to which no traffic information is added up to a predetermined distance to specify the road within the tracked range as a complement object of traffic information; and complementing traffic information to the complement object specified in the complement object retrieving step based on the traffic information added to the complement originator specified by the complement originator retrieving step.
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Specification