Patent ID: 7505773

Claim:
A positioning system comprising: a terminal device having signal receiving section being configured to receive position-related signals from a plurality of position information satellites; and a positioning device being configured to position a current position of said terminal device, said terminal device having a positioning basic information generating section being configured to generate positioning basic information containing pseudo ranges between said respective positioning information satellites and said terminal device based on said position-related signals, a positioning basic information storing section being configured to store said positioning basic information, a timing section being configured to measure time lapse from a previous generation time at which said positioning basic information at a previous time is generated, a calculated positioning basic information generating section being configured to generate calculated positioning basic information indicating a calculated value of current positioning basic information as positioning basic information at the present time based on previous positioning basic information and time lapse from the previous generation time, a within or without allowable range determining section being configured to determine 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 being configured to generate estimated basic information based on a determination result of said within or without allowable range determining section for said positioning device to generate estimated positioning basic information based on the previous positioning basic information, and an information for positioning transmitting section being configured to transmit information to position containing the actually measured current positioning basic information and/or the estimated basic information to said positioning device, and said positioning device having an information for positioning receiving section being configured to receive the information for positioning from said terminal device, an estimated positioning basic information generating section that generates estimated positioning basic information based on the estimated basic information, a positioning calculating section being configured to generate positioning result information by performing positioning calculation of the current position of said 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 being configured to transmit the positioning result information to said terminal device.