| 摘要 |
In a navigation device, the position P GPS , the running speed V, and the running direction Õ are detected based on the Global Positioning System (GPS), while the bearing ¸ is detected based on geomagnetism. The bearing ¸ is corrected using the difference ´=¸-Õ so as to produce the corrected bearing ¸c. The present position P MAG is calculated based on the corrected bearing ¸c as well as the position P GPS and the running speed V which are previously detected. Thus, it is possible to precisely detect the present position P MAG without errors due to deviations between the running direction Õ and the bearing ¸. |
