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针对海洋声速空间非均匀和时变条件下的声场不确定性快速预报问题,根据海洋-声学耦合模式预报声速场时空变化过程,获取声速垂直结构不确定性分布规律,提出经验正交函数-随机多项式展开方法,以降低不确定参数维度,得到声场不确定性分布.数值计算表明该方法在保证同等精度的同时可大幅减少计算量,相比常规随机多项式展开方法计算效率可提高2个数量级,且计算量不随声速剖面复杂程度变化而改变.经海上实验验证,结果表明该方法可实现环境不确定性条件下的声场及其不确定性的快速预报。
Aiming at the problem of rapid prediction of sound field uncertainty under the condition of non-uniform and time-varying sound velocity in ocean, the uncertainty of vertical structure of sound velocity is obtained by predicting the temporal-spatial variation of the sound velocity field based on the ocean-acoustical coupling model. An empirical orthogonal function Polynomial expansion method to reduce the uncertain parameter dimension and obtain the sound field uncertainty distribution.The numerical calculation shows that this method can reduce the amount of computation while ensuring the same precision and can improve the computational efficiency by two orders of magnitude compared with the conventional stochastic polynomial expansion method, And the calculation does not change with the change of velocity profile complexity.According to the experimental verification at sea, the results show that this method can realize the fast prediction of the sound field and its uncertainty under the conditions of environmental uncertainty.