Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Michihisa Komatsu0
Date of Patent
June 16, 2009
0Patent Application Number
112435130
Date Filed
October 4, 2005
0Patent Primary Examiner
Patent abstract
A navigation apparatus and a map matching method are provided. An acceleration sensor detects an acceleration of the vehicle. A gradient determination section determines an angle of inclination of the road link being currently traveled or a value corresponding to the inclination angle. A gradient determination section determines a vertical distance traveled based on the inclination angle and the speed of the vehicle. The accumulated value of the vertical distance is then compared to a set value to determine whether a road link is a downgrade link or an upgrade link. A map matching processor performs map matching processing using a result of the determination and the gradient information.
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