Research On Sound Field Prediction Method Based On Argo And WOA Data

Even today,when marine science has made great progress,problems such as difficulties in observing three-dimensional current in the actual ocean and lack of flow field data still exist.Therefore,it is of great practical significance for further exploration and development of the ocean to fuse the existing ocean databases and establish more refined three-dimensional grid ocean data.This paper mainly fuses the existing marine databases and studies the influence of mesoscale vortex on the acoustic propagation characteristics.The feasibility is verified by simulation and the software design is completed.The research content of this paper mainly includes the following aspects:1?The observation mode and data characteristics of the existing ocean database are studied.Argo real-time observation data and WOA historical average data are fused by two methods of optimal interpolation and empirical orthogonal function to obtain finer three-dimensional gridded ocean data.The simulation results show that optimal interpolation needs to fuse temperature and salinity respectively,and then the analysis value of sound velocity is obtained by empirical formula.The empirical orthogonal function is to fit the sound velocity profile by selecting 3rd-6th order empirical orthogonal functions.The feasibility of the two methods is well proved by studying each target point in the research sea area.The deep sea area is processed by isothermal layer method,and the three-dimensional sound velocity data of the whole sea depth in the research sea area are obtained.2?The Gaussian acoustic beam algorithm is derived,and BELLHOP 3D model is used to calculate the three-dimensional sound field.Through the analysis of convergence area,propagation loss,multi-path arrival structure and time domain waveform of broadband signals,the influence law of mesoscale phenomenon on acoustic propagation characteristics and its three-dimensional effect are summarized,which provides a basis for hydroacoustics research in this area and also provides a reference for other mesoscale phenomena research.3?Based on VS 2015,Qt and MATLAB,the design of underwater sound field calculation software based on ocean database is completed.The software effectively integrates various modules of sound field calculation and enhances its operability.