Communications: electrical – Vehicle position indication – Map display
Patent
1991-08-28
1994-05-10
Swarthout, Brent A.
Communications: electrical
Vehicle position indication
Map display
73178R, 340988, 364449, G08G 1123
Patent
active
053111737
ABSTRACT:
In a navigation system which has sensors for detecting a running distance, an azimuth, etc. of a vehicle, and a memory for storing map data; a probability density of a position of the vehicle is calculated on the basis of the sensor outputs and the map data for each of quantization units with which a probability computation determined by detection accuracies of the sensors and quantization of the map data can be executed. In addition, 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, whereby a plurality of estimative vehicular positions and uncertainties (costs) corresponding to the respective estimative positions are iteratively evaluated, and a correct vehicular position is estimated by selecting at least one estimative vehicular position of low uncertainty (cost).
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Hirayama Yoshikazu
Homma Koichi
Kagami Akira
Kato Makoto
Komura Fuminobu
Hitachi , Ltd.
Swarthout Brent A.
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