Arrayed GPS-buoys wave observation system

Since the period of the long period gravity wave is so long and its amplitude is relatively small, the accurate measurement by the conventional technique was often so difficult. At 2002 Techno-Ocean conference, we had proposed the wave direction finding system using the GPS buoy array using the multiple signal classification method for the wave signal analysis, and it was verified practically enough in the simulation test. After that conference, we had four experiments in order to prove the useful validity of our proposed system. We describe the method and some results of our three experiments and show the excellent accuracy to estimate wave directions.