| 摘要 |
PROBLEM TO BE SOLVED: To perform accurate correction with a reverse system at all times by adding information specifying a GPS satellite acquiring pseudo-distance data to the data and transmitting the data from a mobile station to a managing device. SOLUTION: When data to a data receiver 20 from a mobile station 1 are received, a positioning operating part 23 reads satellite number information, the information of a navigation data number and the receiving time information of the data which are obtained by receiving the data. Pseudo-distance correction value corresponding to a satellite number, a navigation data number and a receiving time which are the same as these information are extracted from a correction value storing part 22, and pseudo-distance data is corrected with this DGPS (differential GPS) correction data. In addition, a positioning operation is performed with the corrected pseudo-distance data by using navigation data, the same navigation data number extracted from the part 22 and the navigation data at the same receiving time, and the current position of the station 1 is calculated and is shown on a position displaying part 24. A DGPS with high accuracy is realized by making the combinations of GPS satellites received by the mobile station and a reference station coincide all the times. |
