| Under the condition of internal waves, the stability of underwater acoustic channel becomes weak, accompanied by the difficulty in the reconstruction of sound velocity profile. Compared with other methods, the advantage of the empirical orthogonal decomposition method is that it can be reconstructed with a small number of parameters, instead of using a number of parameters. In this paper, the empirical orthogonal decomposition method is used to reconstruct the velocity profile in the northern South China Sea. The results show that it is feasible to reconstruct the sound velocity profile in the northern South China Sea by the empirical orthogonal decomposition method, with the cumulative contribution rate of the first three modes reaching up to 96.7%. As a result of analyzing the sample coverage influence on the reconstruction, the EOF analysis of the reconstruction of sound velocity profile indicates that the RMS error is less than 0.95 m/s, when the sample covers the complete tidal cycle. The result of sound speed profile reconstruction is relatively ideal; however, if samples did not cover the full cycle, it would have lager error. |
