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| Number | Title | Issue Date |
| 7616152 | Relative position measurement method and relative position measurement system using satellites A positioning system wherein radio waves from a GPS satellite (4) are received by a reference station (1), the absolute position of which is already known, and a plurality of mobile stations (3) to perform relative positioning among particular s... | 11/10/2009 |
| 7609202 | Relative measurement method and relative measurement system using satellite A measuring system wherein radio waves from a GPS satellite (4) are received by a reference station (1) and a plurality of mobile stations (3) to perform relative measuring among particular stations, thereby measuring the shift amounts of the mo... | 10/27/2009 |
