Position information providing system indoor transmitter and method for providing position information
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United States of America Patent
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Dec 31, 2013
Grant Date -
Mar 3, 2011
app pub date -
Nov 27, 2008
filing date -
Nov 30, 2007
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Provided is a position information providing system which can reduce a time required for acquiring position information. An indoor transmitter is adapted to provide position information by using a second positioning signal compatible with a first positioning signal which is a spread spectrum signal from each of a plurality of satellites. The indoor transmitter includes an EEPROM which stores therein position data for identifying an installation location thereof, an FPGA operable to generate a second positioning signal including the position data as a spread spectrum signal, and a transmitting section operable to transmit the spread spectrum signal. The second positioning signal is generated to repeat the same content in a cycle shorter than that of the first positioning signal.
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