Navigation system and method using map data

Details Navigation system and method using map data Navigation system and method using map data

G - Physics

01

C

343/81

G01C 21/22 (2006.01) G01C 21/20 (2006.01) G01C 21/30 (2006.01)

Patent

CA 1338882

In a vehicle navigation system that has sensors for detecting a travel distance, an azimuth, etc. of the vehicle, and a memory for storing map data; a probability density of the position of the vehicle is calculated on the basis of the sensor outputs and the map data for each of quantization units, by which a probability computation determined by detection accuracies of the sensors and quantization of the map data can be executed. A final stage calculation of DP matching between trajectory data obtained from the on-board sensor data from a start point of the vehicle until a current time, and a candidate route estimated from the road map data is iteratively executed. As a result, a plurality of estimated vehicle positions and uncertainties (costs) corresponding to the respective estimated positions are iteratively evaluated. The correct position is estimated by selecting an estimated vehicle position of low uncertainty (cost).

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