NAVIGATION DEVICE
First Claim
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1. A navigation device for detecting a position so as to perform positional guidance, comprising:
- a first detection device for detecting the position based on Global Positioning System and for detecting a running direction and a running speed based on a plurality of positions sequentially detected at different times;
a second detection device for detecting a bearing thereof based on geomagnetism;
a bearing correction unit for correcting the bearing of the second detection device by use of a difference between the running direction detected by the first detection device and the bearing detected by the second detection device, thus producing a corrected bearing; and
a position calculation means for calculating a present position based on the corrected bearing as well as the position and the running speed previously detected by the first detection device.
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Abstract
In a navigation device, the position PGPS, the running speed V, and the running direction φ are detected based on the Global Positioning System (GPS), while the bearing θ is detected based on geomagnetism. The bearing θ is corrected using the difference δ=θ−φ so as to produce the corrected bearing θc. The present position PMAG is calculated based on the corrected bearing θc as well as the position PGPS and the running speed V which are previously detected. Thus, it is possible to precisely detect the present position PMAG without errors due to deviations between the running direction φ and the bearing θ.
58 Citations
7 Claims
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1. A navigation device for detecting a position so as to perform positional guidance, comprising:
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a first detection device for detecting the position based on Global Positioning System and for detecting a running direction and a running speed based on a plurality of positions sequentially detected at different times; a second detection device for detecting a bearing thereof based on geomagnetism; a bearing correction unit for correcting the bearing of the second detection device by use of a difference between the running direction detected by the first detection device and the bearing detected by the second detection device, thus producing a corrected bearing; and a position calculation means for calculating a present position based on the corrected bearing as well as the position and the running speed previously detected by the first detection device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification