Positional information transmitter, communication terminal, and positioning system using position data

A positional information transmitter comprising:

• a radio transmitter configured to transmit repeatedly a positional information signal from a plurality of antennas spaced apart from each other, the positional information signal compatible with a satellite positioning signal that is a radio signal for positioning transmitted from an artificial satellite, the positional information signal being a radio signal containing position data indicative of a particular position,
• the positional information transmitter signal informing a communication terminal of the particular position specified by the position data when the communication terminal receives the positional information signal,
• the radio transmitter configured to transmit from each of the antennas through one of a plurality of channels the positional information signal containing the position data, the positional information signal being transmitted either simultaneously from the antennas through channels of the plurality of channels which are different between the antennas or sequentially in a time-shifted manner from one antenna to another antenna through any one of the plurality of channels,
• wherein the radio transmitter comprises a plurality of mixers corresponding to the antennas, respectively, and each of the mixers is configured to mix two signals to generate the positional information signal to be transmitted from the corresponding antenna, the two signals being selected from signals generated by sampling transmission bit strings at two different sampling periods, the transmission bit strings containing the position data of one channel or of a plurality of channels, and modulating the sampled transmission bit strings respectively into carrier waves in predetermined frequency bands.