Terminal device and elevation value acquisition method
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United States of America Patent
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Aug 14, 2018
Grant Date -
Oct 20, 2016
app pub date -
Jan 15, 2014
filing date -
Jan 15, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A terminal receives a GPS signal and a GPS correction signal, and a first elevation value calculation unit calculates an elevation value from the GPS signal and the GPS correction signal. The terminal includes an atmospheric pressure information detection unit that detects ambient atmospheric pressure information, and a second elevation value calculation unit for calculating an elevation value from the atmospheric pressure information. If a GPS correction signal can be received, the elevation value calculated by the first elevation value calculation unit is used as the elevation value of the current position and the calculated elevation value is used to calibrate the second elevation value calculation unit. If a GPS correction signal cannot be received, the elevation value calculated by the calibrated second elevation value calculation unit is used as the elevation value of the current position to acquire an accurate elevation value even when inside a building or tunnel.
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