| 摘要 |
A mobile station ( 1 ) is provided having a GPS positioning unit ( 11 ) that receives electric waves from GPS satellites and computes the coordinates of an approximate location of a point to be positioned, performs interferometric positioning on the point to be positioned using correction data used for making a correction to the point to be positioned, which are transmitted from a positioning server apparatus ( 30 ), so as to compute the coordinates in the world geodetic system of the point to be positioned, and a transformation unit ( 12 ) that transforms the coordinates in the world geodetic system of the point to be positioned into those in the existing geodetic system using transformation parameters transmitted from the positioning server apparatus ( 30 ) when the coordinates in the world geodetic system of the point to be positioned are located in the interior of a graphic region transmitted from the positioning server apparatus ( 30 ).
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