Apparatus for transmitting positioning signal, positioning system including the apparatus, and system for transmitting positioning signal

A system for transmitting a positioning signal, comprising:

• a plurality of transmitting apparatuses transmitting a positioning signal,
• wherein each of said plurality of transmitting apparatuses comprises:
• a data store configured to store data to be encoded,
• a time keeper configured to keep time, and
• a receiver configured to receive correction information for correcting information included in the positioning signal, and
• wherein the correcting information comprises:
• position correction data for correcting information representing position of the transmitting apparatus,
• time correction data for correcting time, and
• characteristic correction data for correcting information representing characteristic of a region in which the positioning signal propagates;
• a writer configured to write the correction information received by the receiver in the data store;
• a code generator configured to generate a code pattern based on a code for identifying a transmission source of the positioning signal;
• a signal generator configured to generate a periodic signal;
• a first signal multiplier configured to modulate a carrier wave with the code pattern generated by the code generator;
• an oscillator configured to generate the carrier wave, wherein the carrier wave is frequency modulated based on the periodic signal, the frequency of the modulated carrier wave changing between set frequencies;
• a second signal multiplier configured to modulate the stored data with the multiplied carrier wave to output the positioning signal;
• and
• a transmitter configured to transmit the outputted positioning signal.

A method for transmitting a positioning signal, comprising:

• generating a positioning signal by encoding data stored in a data store based on a code for identifying a transmission source of the positioning signal;
• generating a periodic signal;
• generating a carrier wave by an oscillator;
• frequency modulating the carrier wave by the periodic signal, the frequency of the modulated carrier wave changing between set frequencies;
• multiplying the carrier wave with the code for identifying a transmission source of the positioning signal to obtain a multiplied carrier wave;
• multiplying the encoded data with the multiplied carrier wave to output the positioning signal;
• and
• transmitting the outputted positioning signal based on the modulated carrier wave.