| 摘要 |
PURPOSE:To enable accurate detection of a vehicle position, by correcting the correction value of residual magnetism based on a current position data and a locality data at a starting point for a vehicle when the vehicle returns to the starting point. CONSTITUTION:A locality data at a starting point is inputted from a keyboard 1 when a vehicle is at a starting point. A correction value computing circuit 3 calculates the correction value of residual magnetism based on a magnetism horizontal component data in the longitudinal and horizontal way of the vehicle, detected with a flux gate type bearing sensor 2 as given when the vehicle makes a turn. A correction value computing circuit 4 corrects the correction value of residual magnetism using the current position data and the starting point data of the vehicle and the resulting value is used as such in the subsequent running. The ongoing azimuth of the vehicle is calculated with a direction computing circuit 5 and the current position data thereof, with a vehicle position computing circuit 7. |
