| 摘要 |
A technique whereby paths in insufficient-GPS-signal segments are computed with high precision is provided. In one embodiment, a GPS receiver (2), a gyroscope (3), an acceleration sensor (4), and a vehicle-speed sensor (5) are used to obtain vehicle driving information at prescribed time intervals. A control device (1) computes a driving path from said vehicle driving information. Insufficient-GPS-signal segments are either set in advance or set on the basis of angular acceleration. Outside of the insufficient-GPS-signal segments, the control device (1) computes the driving path on the basis of stable GPS signals. In the insufficient-GPS-signal segments, i.e. segments in which GPS signals are erratic, the control device (1) performs interpolation using nth-order approximation. In said insufficient-GPS-signal segments, the control device (1) performs drift determinations and interpolates using dead reckoning when not in a drift state but using nth-order approximation when in said drift state. |
