Position determining system using transmitted position information
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United States of America Patent
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Nov 29, 2005
Grant Date -
Apr 10, 2003
app pub date -
Jan 2, 1997
filing date -
Jan 2, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention is a system and method for automated position location using RF signposting. The present invention comprises a plurality of transmitting units placed throughout a service area. Each transmitting unit repeatedly transmits a signal including position information related to a position associated with the transmitting unit. The position information may be an absolute position or an encoded position based on the structure of a building in which the transmitting unit is located. A receiving unit receives the signal transmitted from a transmitting unit and determines the position of the receiving unit, based on the received indication. The transmitting units are placed to provide uniform coverage of the service area, thus providing position location indoors and in urban areas where GPS does not function properly.
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