An improved empirical orthogonal functions(EOF) on the forecast of ocean sound speed profile

Based on empirical orthogonal functions(EOF), the article gave a prediction method of sound speed profile, the depth of which is below the thermocline.First, it improved the method to get the solution of covariance matrix and mix the position information of the original data and the time information together into the covariance matrix;and then, gave several empirical time function formulas calculated with a lot of real statistics.It could predict the acoustic speed profile.Compared with the traditional prediction method with the real statistics, the precision of the improved method could make a better improvement than the prediction that used the traditional EOF.