Apparatus for transmitting positioning signal, positioning system including the apparatus, and system for transmitting positioning signal
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United States of America Patent
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Oct 19, 2010
Grant Date -
Jan 11, 2007
app pub date -
Jul 3, 2006
filing date -
Jul 5, 2005
priority date (Note) -
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status (Latency Note)
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Abstract
An apparatus that can transmit a signal enabling higher accuracy of calculating positional information is provided. A transmitting apparatus transmitting a positioning signal includes an oven controller crystal oscillator (OCXO) having a thermostatic oven that keeps the temperature of a quartz resonator constant and oscillates such that variation in output frequency caused by the ambient temperature change is minimized, a voltage controlled oscillator (VCO) outputting a signal modulated in accordance with the signal from OCXO, multipliers, a code generator outputting code patterns for respectively identifying each of artificial satellites on which the transmitting apparatus is mounted to multiplier, a memory storing a navigation message, a transmitting portion, and an antenna.
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