A method and an apparatus for detecting location of a movable body in a navigation
system comprising a map data detector for detecting map information of a region
corresponding to location information from an external digital map storage on the
basis of the location information of the movable body transmitted from sensors
sensing the location and traveling information of the movable body; a memory for
storing the map information detected from the map data detector; a filter for computing
an optimum location of the movable body including road error included in the map
information on the basis of the location and traveling information of the movable
body transmitted from the sensors; and a map-matching unit for receiving the optimum
location information of the movable body from the filter and correcting the optimum
location information by matching the optimum location information and the map information
stored in the memory. The method and apparatus can apply a constraint to the location
of the movable body by computing the location of the movable body including a width
of road, in comparison with a case using only direction of road as a measured value.
Further, the method and apparatus increases accuracy of location determination
of the movable body by performing real-time correction of the sensor information
including error whenever the sensor information is inputted, using the constraint
model including the map information.
