NAVIGATION SIGNAL TRANSMITTING APPARATUS, NAVIGATION SIGNAL TRANSMISSION METHOD AND POSITIONAL INFORMATION PROVIDING APPARATUS
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United States of America Patent
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Issued Date -
May 23, 2013
app pub date -
May 11, 2011
filing date -
May 13, 2010
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Abstract
A navigation signal transmitting apparatus, provided on ground, for transmitting a navigation signal to a receiver capable of positioning by receiving a spread spectrum satellite positioning signal from a satellite has first and second transmission antennas; a message generating unit that generates a message signal of positional information included in the navigation signal, and a modulating unit that modulates the message signal by a modulation process including spectrum spreading, based on spread codes of the same sequence as the satellite positioning signal allotted in advance to the navigation signal transmitting apparatus, for generating first and second navigation signals. The modulating unit executes the modulating process using either one of the first and second navigation signals as an object of demodulation at each time of reception by the receiver.
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