| 摘要 |
PURPOSE:To make it possible to correct the magnetization of a vehicle body on the basis of a small quantity of data within a short time, by calculating the quantity of magnetization of the vehicle body from the advance azimuth of a vehicle calculated from the position of the vehicle calculated by a radiowave navigation operating part, the magnetic field calculated by an earth magnetism sensor and the magnitude of the horizontal component of a predetermined magnetic field. CONSTITUTION:An earth magnetism sensor 1 converting the horizontal component of earth magnetism to two X- and Y-voltages according to the direction of a vehicle, a distance sensor 2 generating a signal at each time when a vehicle moves over a definite distance and a relative position operating circuit 3 calculating an advance azimuth from X- and Y-data from the earth magnetism sensor 1 and calculating the relative position of the vehicle on the basis of said advance azimuth and the distance data from the distance sensor 2 are provided. A GPS position operating circuit 4 receives the radiowave from a GPS satellite to operate the absolute position of the vehicle. A magnetization correcting operation circuit 5 operates the quantity of magnetization of the vehicle on the basis of the advance azimuth data from the position operating circuit 4, the magnetic data from the earth magnetism sensor 1 and the magnitude of the horizontal component of the magnetic field of earth magnetism to apply the same to the relative position operating circuit 3. |
