PURPOSE: To provide a dead reckoning position correcting method in dead reckoning navigation capable of corresponding a dead reckoning position even when travel on an area where no remarkable feature is in road shape and is outside a road is performed by the dead reckoning navigation. ;CONSTITUTION: When the travel by the dead reckoning navigation by using a three-dimensional navigation system 1 equipped with an optical fiber gyro 2, an earth magnetic sensor 3, and a wheel rotary sensor 4 is performed, its own dead reckoning position P1' calculated in time series from a travel start position P0 by posture angle data and speed data obtained from the sensors 2-4 of the three-dimensional navigation system 1 is compared with its own actual position P1 obtained from a three-dimensional map 6 which holds altitude Z as the function of a horizontal directional coordinate, and the horizontal directional coordinate at its own dead reckoning position P1' is corrected based on the altitude Z at its own actual position.;COPYRIGHT: (C)1995,JPO
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