| 摘要 |
PROBLEM TO BE SOLVED: To obtain a DGPS position locating system which can compute a relative position while a moving station designated as a master station is used as a reference, by a method wherein position data whose time is identical for the master station and a slave station is used, the relative position is computed and the position of every mobile using the master station as a reference is displayed on a digital map. SOLUTION: By a computer 5 in a master station 2a, an input device 6 is used, and the master station 2a is set. Then the master station 2a executes a processing operation. When a GPS receiver 4 outputs an own position, the sampling time Tp and the position Pp (t) of the master station 2a are updated. Then the position Pp (t) is smoothing-processed, and a reference position Ps (t) is obtained. In addition, as data on the master station 2a, the reference position Ps (t), the position Pp (t), the sampling time Tp and a capturing satellite number SNp (t) are transmitted via a communication device 7. At the same time, a digital map is read out from an external storage device, and the computed position Ps (t) is displayed on the digital map as the position of the master station 2a. The communication device receives position data on a slave station 2b. When the sampling time Tc of the position data on the slave station 2b is equal to the time Tp of the master station 2a, the relative coordinates RPc of the slave station 2b is computed. |
