Appeal No. 96-2418
Application 08/137,267
application.
The invention relates to a method and apparatus for
correcting a distance error of a navigation apparatus which
corrects the shift between a measured present position and an
actual position on a road on which the movable body is
travelling, so as to improve the accuracy of the present position
on an electronic map.
The independent claim 1 is reproduced as follows:
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
2
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