Method of correcting distance error of navigation apparatus and

Details Method of correcting distance error of navigation apparatus and Method of correcting distance error of navigation apparatus and

1993-10-18

1998-04-21

Louis-Jacques, Jacques H.

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

701201, 701205, 701210, 701217, 701224, 73178R, 340988, 342357, 342457, G06G 778

Patent

active

057429235

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.

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