抄録
There has been a great progress in position measurement capability of well-known Global Positioning Systems (GPS) and the accuracy has been remarkably improved, especially in a kinematic GPS which is based on the phase identification of GPS carrier waves. The authors have carried out the detailed measurement of the distances between two fixed positions on land, and later between a fixed position on land and moving one on board of the training ship "Kojima" and the accuracy in both measurements is evaluated about 2cm horizontally and 5cm vertically. The sea trials of the coastal cargo ship have been carried out by use of the kinematic GPS and the precise measurement of ship motions has been successfully achieved. The real time kinematic system can supply the good monitoring data of ship position with longitudinal and lateral velocities and after the trials, accelerations in surging, swaying and yawing of every instance can be estimated by the KGPS. It is finally concluded that the KGPS is an excellent tool for sea trials as well as navigation.
