To provide an "on-vehicle navigation device" for accurately calculating one's own vehicle position at a point where a GPS signal cannot be received by calculating accurate vehicle speed without using a vehicle speed pulse.
The correlation (speed ratio K) between vehicle speed (first vehicle speed (a) calculated based on the GPS signal immediately before a GPS non-receiving period) and a video speed (video speed (b) calculated based on photographed video of an on-vehicle camera at the start time of the GPS non-receiving period) is considered to be kept even in the GPS non-receiving period. By multiplying the speed ratio K by a video speed (b') in the GPS non-receiving period, a second vehicle speed (a') is calculated as a false first vehicle speed, and the second vehicle speed (a') is used for autonomous navigation.
Takashi Ito
Yoshimi Hatanaka
Naoko Okura
Fumari Tamari
Takeyuki Suzuki
Shiro Isoda
Yohei Takahashi
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