Car navigation system and car navigation control method
First Claim
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1. A car navigation apparatus comprising:
- a current position detection device that detects a current position of a vehicle; and
a control device that detects a plurality of roads as candidates used for map matching based upon roadmap information containing road data used for navigation of the vehicle and the current position detected by the current position detection device, and execute the map matching with a most appropriate road among the plurality of roads, the map matching being executed for a current position display of the vehicle, wherein;
the control device makes a decision as to whether or not a road among the plurality of roads as the candidates used for the map matching forms a circular crossroad and does not execute the map matching when a road among the plurality of roads used as the candidates used for the map matching is judged to form a circular crossroad.
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Abstract
A car navigation apparatus includes: a current position detection device that detects a current position of a vehicle; and a control device that detects a plurality of roads as candidates used for map matching based upon road map information containing road data used for navigation of the vehicle and the current position detected by the current position detection device, and execute map matching with a most appropriate road among the plurality of roads, and the control device does not execute map matching when a road among the plurality of roads as the candidates used for the map matching is judged to form a circular crossroad.
19 Citations
10 Claims
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1. A car navigation apparatus comprising:
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a current position detection device that detects a current position of a vehicle; and
a control device that detects a plurality of roads as candidates used for map matching based upon roadmap information containing road data used for navigation of the vehicle and the current position detected by the current position detection device, and execute the map matching with a most appropriate road among the plurality of roads, the map matching being executed for a current position display of the vehicle, wherein;
the control device makes a decision as to whether or not a road among the plurality of roads as the candidates used for the map matching forms a circular crossroad and does not execute the map matching when a road among the plurality of roads used as the candidates used for the map matching is judged to form a circular crossroad. - View Dependent Claims (2, 7, 8)
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3. A car navigation control method comprising:
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a first step in which a current position of a vehicle is detected;
a second step in which a plurality of roads as candidates used for map matching are detected based upon roadmap information containing road data used for navigation of the vehicle and the current position of the vehicle having been detected, the map matching being executed for a current position display of the vehicle;
a third step in which a decision is made as to whether or not a road forming a circular crossroad is included in the plurality of roads as the candidates used for the map matching; and
a fourth step in which map matching is executed with a most appropriate road among the plurality of roads having been detected when no road among the plurality of roads as the candidates used for the map matching is judged to form a circular crossroad and no map matching is executed when a road among the plurality of roads as the candidates used for the map matching is judged to form a circular crossroad. - View Dependent Claims (9, 10)
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4. A computer-readable computer program product having a car navigation control program, the control program comprising:
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a first instruction code for detecting a current position of a vehicle;
a second instruction code for detecting a plurality of roads as candidates used for map matching based upon roadmap information containing road data used for navigation of the vehicle and the current position of the vehicle having been detected, the map matching being executed for a current position display of the vehicle;
a third instruction code for making a decision as to whether or not there is a road forming a circular crossroad among the plurality of roads as the candidates used for the map matching; and
a fourth instruction code for executing the map matching with a most appropriate road among the plurality of roads having been detected when no road among the plurality of roads as the candidates used for the map matching is judged to form a circular crossroad, and executing no map matching when a road among the plurality of roads as the candidates used for the map matching is judged to form a circular crossroad. - View Dependent Claims (5, 6)
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Specification
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Current AssigneeClarion Co., Ltd. (Faurecia SA)
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Original AssigneeXanavi Informatics Corporation (Hitachi, Ltd.)
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InventorsSato, Hiroyuki
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Primary Examiner(s)Camby, Richard M.
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Application NumberUS10/487,418Publication NumberTime in Patent Office1,291 DaysField of Search701/23, 701/24, 701/25, 701/200, 701/207, 701/208, 701/209, 701/210, 701/213, 701/300, 701/301, 342/357.06, 342/357.08, 342/357.09US Class Current701/207CPC Class CodesG01C 21/30 Map- or contour-matchingG08G 1/0969 having a display in the for...
