The Namigata direction spectrum and the system and the method of measuring wave crest

摘要

(57) Abstract Making use of the multiplex bimusona system (100), one in liquid environment or it is the system and the method of measuring the direction spectrum of the plural waves. Regarding typical execution form, in order to offer the speed data, the range which are provided inside the plural acoustic beams (104) & the cell which are sampled. With option, also height of the wave surface and the data of the water pressure are obtained in the same way. This speed, as for the data of wave crest, and the water pressure, Fourier being converted inside the system (100) one or by the plural signal processing devices (178), the water surface high spectrum is formed. Also the piled spectrum factor matrix at each observation frequency, is formed from this data. It solves wave equality at each frequency, in order to form the frequency specific Namigata direction spectrum, with maximum likelihood method (MLM), repetitive maximum likelihood method (IMLM) or other similar method, it can use the sensitivity vector which especially it is related to the transmitter array (103) form of ADCP. Finally, the frequency specific spectrum is connected in order to form the complete two dimensional Namigata direction spectrum. The system (100) can also measure flux profile with direction and wave crest of the wave, as a function of the depth of water.