浅海复杂环境下等效声速剖面的构建方法

A method of constructing equivalent sound speed profile in complex shallow water

针对浅海复杂环境声速剖面水平变化情况下的声传播损失预报及目标定位问题,提出了一种基于遗传算法的等效声速剖面重构算法。首先,将声速剖面进行时间和空间上的分解,从而将声速剖面抽象为对声速剖面前三阶正交函数系数的反演;其次,利用遗传算法,以先验声速剖面集为基础,进行参数反演。仿真结果表明,在浅海复杂条件下,传播损失预报受声速剖面及海洋参数的影响,不能直接运用接收或发射位置处的声速剖面进行传播损失预报,否则会对预报结果造成误差。通过构建具有声传播累积效应的等效声速剖面可以提高匹配场定位精度,完成目标定位,且在构建等效声速剖面时,接收位置处即本地声速剖面所占权重较大。

Aiming at the problem of acoustic transmission loss prediction and target localization under the condition of sound speed profile in shallow water horizontal change environment, an algorithm for equivalent sound speed profile reconstruction based on genetic algorithm is proposed. Firstly, the sound speed profile is decomposed in time and space, so that the sound speed profile is abstracted into the inversion of the first 3rd order orthogonal function coefficients of the sound speed profile. Secondly, the genetic algorithm is used to inverse the parameters based on the a priori sound speed profile. The simulation results show that under the complex conditions of shallow water, the prediction of transmission loss is affected by the sound speed profile and ocean parameters. The sound speed profile at the receiving or transmitting position cannot be directly used to predict the transmission loss, which will cause errors in the prediction results. By constructing the equivalent sound speed profile with the cumulative effect of acoustic propagation, the accuracy of the matched field localization can be improved, and the target localization can be completed. When constructing the equivalent sound speed profile, the local sound speed profile, at the receiving position has a larger weight.