Evaluation Test Result on Wave Direction Measurement Using GPS Buoy

In this paper, we apply the velocity integration method to measure a wave direction using buoys. A prototype system of the wave direction measurement with GPS buoys is proposed, and one simple observation method about wave direction is shown. Next, one test to evaluate this proposed system is described. Buoys equipped with GPS were moored in the observational sea area. As 3D movements of the buoys depend on the movement of seawater particles, we use the velocity integration method to get the precise velocity information of the buoys and apply the velocity to estimate the position of the buoys. As the test result, we can find the precise and reliable wave direction according to the horizontal displacement of the buoys with the 3D buoy movement analysis.