| 摘要 |
PURPOSE:To make it possible to perform accurate position detection, by performing correction of magnetization in consideration of an elliptic locus, thereby detecting the direction of the magnetic field highly accurately. CONSTITUTION:The direction of a magnetic field vector detector 11 is arbitrarily changed at least four or more time for every vehicle. Then, the magnetic vector for every direction is measured. The result is temporarily stored in a memory 18. A processing part 13 processes the stored data and computes the coordinates (Ox and Oy) of the center of an ellipse, elliptic rate alpha and a radius R of a circle, which is contacted with the ellipse. The values are stored in an error correcting value memory 16. When the vehicle is inclined, the value of the magnetic field vector detector 11 is corrected by the values of an inclinometer 14 in the forward and backward directions and an inclinometer 14' in the right and left directions, and the results are sent to the processing part 13. The data, which is sent to the processing part 13 through an A/D converter 12, is corrected by the correcting data from the error correcting value memory 16 and sent to a display part 17. |
