Abstract: A position information transmitter including: a digital processing device including a CPU and a position information database storing position information of the position information transmitter and information of channels used by other position information transmitters; and a radio transmitting device executing a signal modulation, wherein the digital processing device generates spread spectrum signals from the position information of the position information transmitter and information of channels used by other position information transmitters, by using the C/A code, and the radio transmitting device modulates the spread spectrum signals and transmits modulated signals as a radio signals.

Abstract: A position information transmitter including: a digital processing device including a CPU and a position information database storing position information of the position information transmitter and information of channels used by other position information transmitters; and a radio transmitting device executing a signal modulation, wherein the digital processing device generates spread spectrum signals from the position information of the position information transmitter and information of channels used by other position information transmitters, by using the C/A code, and the radio transmitting device modulates the spread spectrum signals and transmits modulated signals as a radio signals.

Abstract: In a positioning system comprising a position information transmitter that transmits a position information signal containing position information indicative of a position as a signal compatible with a satellite positioning signal transmitted from an artificial satellite and a communication terminal that when receiving the satellite positioning signal, finds a current position of the communication terminal by finding a position of the artificial satellite and that when receiving the position information signal, finds a current position of the communication terminal based on the position information, the position information transmitter transmits the position information signal containing a boundary flag that determines which of the satellite positioning signal or the position information signal each of correlators of the communication terminal is to receive, and the communication terminal sets which of the satellite positioning signal or the position information signal each of the correlators is to receive ba

Abstract: A positioning information transmitter transmits a positioning identifier instead of directly transmitting position information. A positioning information management server stores and manages the positioning identifier and the position information while correlating them with each other. In response to a position information request with a positioning identifier, the positioning information management server converts the positioning identifier into position information according to the aforementioned correlation. Furthermore, the positioning information management server updates the positioning identifier to be transmitted from the positioning information transmitter in a certain time by using predetermined means.

Abstract: In a positioning system comprising a position information transmitter that transmits a position information signal containing position information indicative of a position as a signal compatible with a satellite positioning signal transmitted from an artificial satellite and a communication terminal that when receiving the satellite positioning signal, finds a current position of the communication terminal by finding a position of the artificial satellite and that when receiving the position information signal, finds a current position of the communication terminal based on the position information, the position information transmitter transmits the position information signal containing a boundary flag that determines which of the satellite positioning signal or the position information signal each of correlators of the communication terminal is to receive, and the communication terminal sets which of the satellite positioning signal or the position information signal each of the correlators is to receive ba