Development and Experimental Results of GPS Wave Direction Finding System

H. Fujii, N. Kouguchi, H. Ishida, I. Deguchi

Abstract:	Since the period of the long period gravity wave is from some tens seconds to some tens minutes and so long and its amplitude is relatively small, the accurate measurement by the conventional observation technique is often so diffcult. When the perturbation of the water surface of propagating waves is considered to be a narrowband signal, authors have showed that the propagation direction of the waves could be estimated accurately by applying the Multiple Signal Classi?cation (MUSIC) method to the wave signal on the basis of simulation and observation results when the observation buoys installed with the GPS system were arrayed in the double-triangle formation and the wave height could be measured in millimeter level. By this research, the propagation direction of a swell in Osaka Bay propagating from the typhoon, which can be considered to be a narrowband signal, was measured by the GPS buoy array wave direction observation system. The observation results showed that this proposed GPS buoy system was very effective, practical, and useful to measure the propagation direction of the long period gravity wave. Furthermore, the minimum distance between the buoys and the relationship between S.N.R. and the accuracy are also examined by the numerical simulation. It is concluded that the propagation direction of the long period gravity wave estimated by this system is quite effective and accurate.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	75 - 83
Cite this article:	Fujii, H., Kouguchi, N., Ishida, H., Deguchi, I., "Development and Experimental Results of GPS Wave Direction Finding System," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 75-83.
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