Navigation apparatus

Details Navigation apparatus Navigation apparatus

1996-10-16

1999-05-11

Nguyen, Tan Q.

Data processing: vehicles, navigation, and relative location

Navigation

Determination of travel data based on the start point and...

701209, 701210, 340990, 340995, G06F165/00

Patent

active

059023490

ABSTRACT:
A navigation apparatus is provided which can search out, even if a vehicle goes off of a guide route, a route which allows the vehicle to return to the guide route so that the travel distance to a destination may be comparatively short. A guide route control unit calculates, when the vehicle is in an off-route condition, rectilinear distances from a vehicle position to nodes on the guide route and route distances from the nodes to the destination along the guide route. The control unit modifies the rectilinear distances and the route distances using first and second weighting coefficients, respectively, which are set so that the second weighting coefficient is greater than the first weighting coefficient, and calculates sums of the rectilinear and route distances modified with the first and second weighting coefficients, respectively. The control unit then determines one of the nodes which exhibits the lowest one of the sums as a return point, and searches for a route from the vehicle position to the return point. The navigation apparatus guides the vehicle to the return point along the route thus searched out.

REFERENCES:
patent: 5559511 (1996-09-01), Ito et al.
patent: 5652706 (1997-07-01), Morimoto et al.
patent: 5659476 (1997-08-01), Lefebvre et al.
patent: 5689423 (1997-11-01), Sawada
patent: 5774073 (1998-06-01), Mackawa et al.

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