Positional information providing system, positional information providing apparatus and transmitter
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United States of America Patent
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May 24, 2011
Grant Date -
May 7, 2009
app pub date -
Apr 2, 2007
filing date -
Apr 4, 2006
priority date (Note) -
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Abstract
Positional information is provided at a place out of reach of radio wave. The process executed by a positional information providing apparatus includes the steps of: obtaining a received positioning signal; specifying an emission source of the positioning signal; obtaining, when the emission source of the positioning signal is outdoors, a navigation message included in the positioning signal; executing a process for calculating the position based on the signal; obtaining, when the emission source of the positioning signal is indoors, message data from the positioning signal; obtaining coordinate values from the data; and displaying positional information based on the coordinate values.
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