【摘要】 在浅海环境中,声速剖面和海底深度在水平方向上的变化都会对声传播产生较大的影响。将声速剖面用前几阶经验正交函数来表示,在一定范围的海域各阶经验正交函数系数可以近似为随水平距离线性变化,提出了一种非分层海洋中的声线计算方法,可以计算到达接收水听器的本征声线和传播时间。该方法计算速度快,计算精度较高,可以用于海洋中的声速剖面快速反演。更多还原

【Abstract】 The horizontal variations of sound speed profile and ocean water depth have a significant effect on acoustic propagation in shallow sea water. Here,a method for calculating sound travel time based on the ray theory in unstratified ocean was proposed. An efficient algorithm was applied to seek eigen acoustic rays arriving at hydrophones.The sound speed profile could be described approximately using empirical orthogonal functions( EOFs) with a proper precision. The coefficients of EOFs vary linearly with horizontal distance in a certain sea area. It was shown that the proposed method can be used to calculate the travel time of eigen-acoustic rays arriving at hydrophones rapidly with a higher precision,it can be used for fast inversion of sound speed profile in ocean.更多还原