Three-dimensional Complex Sea Area Sound Field Characteristics And Software Realization

Due to the existence of complex boundary conditions and complex sound velocity field environment,the sound field propagation in the actual ocean environment has a three-dimensional effect.Two-dimensional sound field propagation often cannot characterize the complexity of the real ocean environment,including seabed conditions,sea surface conditions,sound velocity profiles,and sound scatterers.Among them,complex conditions such as sea surface,internal waves,and fish schools are greatly affected by time changes.Although the commonly used sound field calculation models can also calculate the arrival time of the signal,the marine environment has not changed with time.Therefore,it is necessary to establish a three-dimensional sound field model that can update the marine environment over time to analyze the sound field characteristics of the complex marine environment.This paper mainly uses the two-dimensional and three-dimensional models of ray and parabolic theory to analyze the characteristics of the sound field of the complex ocean environment,and demonstrate the impact of the complex ocean environment on sound propagation,including soliton internal waves,mesoscale vortices,complex sea surfaces and complex seabeds.In addition,for the time-varying internal wave environment,a ray theory with time interval as a variable is established,so that the marine environment is updated every time the calculation is performed,and then the sound pressure in the sound field is calculated,and the three-dimensional model of the ray is applied to the sound field characteristics of the complex marine environment Perform analysis and comparison to verify the accuracy of the three-dimensional ray model based on time variables.In order to facilitate the realization of sound field numerical calculations,this paper uses Qt to program the three-dimensional ray theory based on time scales,and develops sound field prediction software,introduces real sea conditions,and realizes sound pressure,propagation loss,sound ray trajectory,sound velocity profile,emission signal,Interface display of received signal and sound field characteristics.The software has the characteristics of easy operation,comprehensive functions,friendly interface,fast calculation speed,etc.