一种基于低频水声传播特性的浅海地声参数反演方法研究

A Study on the Acoustic Parameter Inversion Method based on Acoustic Propagation Characteristics in Low Frequency

针对浅海海底声学参数的获取问题,本文研究了一种基于低频水声传播特性的地声参数反演方法。以单水听器接收到各距离点上的复声压为研究对象,通过快速场方法(Fast Field Method,FFM)计算曲线预报结果,依据似然函数建立其与实测数据间的目标函数,最后应用模拟退火算法(Simulated Annealing,SA)寻优得到实测环境下参数最优解。数值模拟与水池实验处理结果均验证了本方法的有效性。

To obtain geo-parameters in shallow water, an inversion method based on acoustic propagationcharacteristics under low frequency is studied in this paper. The complex sound pressure received bya singlehydrophone at different distance is taken as the study object, and the prediction results are calculated by thefast field method. In view of a likelihood-based cost function between prediction results and measured data,the optimal solution for measured environment can be obtained by using simulated annealing algorithm. Theresults of numerical simulation and tank experiment verify the effectiveness of this method.