Positioning system, terminal device, positioning device, control method for terminal device, control program for terminal device, and computer-readable recording medium for recording control program for terminal device

摘要

A positioning system including: a terminal device having signal receiving section that receives position-related signals from plural position information satellites; and a positioning device for positioning a current position of the terminal device, wherein the terminal device has: a positioning basic information generating section that generates positioning basic information containing pseudo ranges between the respective positioning information satellites and the terminal device based on the position-related signals; a positioning basic information storing section that stores the positioning basic information; a timing section that measures time lapse from a previous generation time at which the positioning basic information at a previous time is generated; a calculated positioning basic information generating section that generates calculated positioning basic information indicating a calculated value of current positioning basic information as positioning basic information at the present time based on the previous positioning basic information and the time lapse from the previous generation time; a within or without allowable range determining section that determines whether a difference between the pseudo range of the actually measured current positioning basic information and the pseudo range of the calculated positioning basic information falls within an allowable range or not; an estimated basic information generating section that generates estimated basic information based on a determination result of the within or without allowable range determining section for the positioning device to generate estimated positioning basic information based on the previous positioning basic information; and an information for positioning transmitting section that transmits information for positioning containing the actually measured current positioning basic information and/or the estimated basic information to the positioning device, and the positioning device has: an information for positioning receiving section that receives the information for positioning from the terminal device; an estimated positioning basic information generating section that generates the estimated positioning basic information based on the estimated basic information; a positioning calculating section that generates positioning result information by performing positioning calculation of the current position of the terminal device based on the actually measured current positioning basic information and/or the estimated positioning basic information; and a positioning result information transmitting section that transmits the positioning result information to the terminal device.