GPS position by the velocity integration method is applied to find the buoy positions that were set up to estimate the precise wave direction. There are two positioning cases by the velocity integration method. One case is a point positioning and the other is a differential positioning. In this paper, on the basis of the experimental results of five buoys on the sea, some comparative results between the vertical point positioning by the velocity integration method and the position by the kinematic GPS are shown respectively. Additionally, the effect of differential positioning by the velocity integration method is examined. From these experimental results, the 3D displacements of movable body by the velocity integration method could be obtained over 0.07 Hz accurately.
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