Method of correcting distance error of navigation apparatus and navigation apparatus
First Claim
1. A method of correcting a distance error of a navigation apparatus for displaying at least a present position and an advance direction of a movable body on map information including road position information, said apparatus including a measuring means for detecting a travelling distance and the advance direction and periodically measuring an advanced position, to which the movable body is assumed to have advanced from the present position, to update the present position by the advanced position,said method comprising the steps of:
- setting the present position as a first present position candidacy;
positioning a plurality of second present position candidacies on positions corresponding to the road forward and backward of the first present position candidacy;
measuring the advanced position with respect to each of the first and second present position candidacies as a standard position, on the basis of the detected travelling distance and advance direction;
calculating a correction amount of each measured advanced position, to correct each measured advanced position onto a position corresponding to the road according to the road position information;
selecting one of the first and second present position candidacies, which calculated correction amount is the minimum; and
updating the present position by the corrected advanced position of the selected one candidacy.
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Accused Products
Abstract
A navigation apparatus displays a present position and an advance direction of a movable body on map information including road position information, and includes a measuring device for detecting a travelling distance and the advance direction and periodically measuring an advanced position, to update the present position. A method of correcting a distance error of the navigation apparatus includes the steps of: setting the present position as a first present position candidacy; positioning a plurality of second present position candidacies on positions corresponding to the road forward and backward of the first present position candidacy; measuring the advanced position with respect to each of the first and second present position candidacies as a standard position, on the basis of the detected travelling distance and advance direction; calculating a correction amount of each measured advanced position, to correct each measured advanced position onto a position corresponding to the road according to the road position information; selecting one of the first and second present position candidacies, which calculated correction amount is the minimum; and updating the present position by the corrected advanced position of the selected one candidacy.
63 Citations
10 Claims
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1. A method of correcting a distance error of a navigation apparatus for displaying at least a present position and an advance direction of a movable body on map information including road position information, said apparatus including a measuring means for detecting a travelling distance and the advance direction and periodically measuring an advanced position, to which the movable body is assumed to have advanced from the present position, to update the present position by the advanced position,
said method comprising the steps of: -
setting the present position as a first present position candidacy; positioning a plurality of second present position candidacies on positions corresponding to the road forward and backward of the first present position candidacy; measuring the advanced position with respect to each of the first and second present position candidacies as a standard position, on the basis of the detected travelling distance and advance direction; calculating a correction amount of each measured advanced position, to correct each measured advanced position onto a position corresponding to the road according to the road position information; selecting one of the first and second present position candidacies, which calculated correction amount is the minimum; and updating the present position by the corrected advanced position of the selected one candidacy. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A navigation apparatus comprising:
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a memory means for storing map information including road position information; a display means for displaying at least a present position and an advance direction of a movable body on the map information; a detecting means for detecting a travelling distance and the advance direction; and a controlling means for setting the present position as a first present position candidacy, positioning a plurality of second present position candidacies on positions corresponding to the road forward and backward of the first present position candidacy, measuring an advanced position to which the movable body is assumed to have advanced from each of the first and second present position candidacies as a standard position on the basis of the detected travelling distance and advance direction, calculating a correction amount of each measured advanced position to correct each measured advanced position onto a position corresponding to the road according to the road position information, selecting one of the first and second present position candidacies, which calculated correction amount is the minimum, and updating the present position by the corrected advanced position of the selected one candidacy. - View Dependent Claims (10)
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Specification