Ocean reverberation is an important issue in underwater acoustics due to the significant influence on working performance of the active sonars. In this paper, a uniform bottom-reverberation model is proposed based on ...Ocean reverberation is an important issue in underwater acoustics due to the significant influence on working performance of the active sonars. In this paper, a uniform bottom-reverberation model is proposed based on ray theory, which can calculate monostatic and bistatic reverberation intensity and explain the generation process of deep-water reverberation. The mesh meth-od is firstly used in this model by dividing bottom scatterers into a number of grids. Then reverberation is calculated based on the exact time of scattering signal generated on each grid. Due to exact arrival time, the presented model can provide more accurate result than classical models, in which scatterers are usually treated as circular rings or elliptical rings. Numerical results are compared with reverberation data collected from the South China Sea deep-water experiment with different receiving distances and depths. The simulated and experimental results agree well overall.展开更多
针对电磁混响室难以仿真的问题,分析了平面波叠加模拟混响室场分布的合理性,根据理想混响室特征给出了叠加平面波的幅值、极化角度等参数设置的细节信息。在此基础上,利用Matlab调用FEKO的混合编程方法进行了场环境模拟,检验结果表明,...针对电磁混响室难以仿真的问题,分析了平面波叠加模拟混响室场分布的合理性,根据理想混响室特征给出了叠加平面波的幅值、极化角度等参数设置的细节信息。在此基础上,利用Matlab调用FEKO的混合编程方法进行了场环境模拟,检验结果表明,叠加场环境特性与混响室场分布特性保持了一致。利用该方法,对某开缝矩形腔体的屏蔽效能进行了仿真测试,并取得了与实测数据相符的结果,其屏蔽效能约为15 d B。该方法有效避免了对混响室的精确建模,大大降低了混响室条件下相关测试仿真的难度与计算量,同时为深入分析混响室场环境特性提供了一条捷径。展开更多
文摘Ocean reverberation is an important issue in underwater acoustics due to the significant influence on working performance of the active sonars. In this paper, a uniform bottom-reverberation model is proposed based on ray theory, which can calculate monostatic and bistatic reverberation intensity and explain the generation process of deep-water reverberation. The mesh meth-od is firstly used in this model by dividing bottom scatterers into a number of grids. Then reverberation is calculated based on the exact time of scattering signal generated on each grid. Due to exact arrival time, the presented model can provide more accurate result than classical models, in which scatterers are usually treated as circular rings or elliptical rings. Numerical results are compared with reverberation data collected from the South China Sea deep-water experiment with different receiving distances and depths. The simulated and experimental results agree well overall.
文摘针对电磁混响室难以仿真的问题,分析了平面波叠加模拟混响室场分布的合理性,根据理想混响室特征给出了叠加平面波的幅值、极化角度等参数设置的细节信息。在此基础上,利用Matlab调用FEKO的混合编程方法进行了场环境模拟,检验结果表明,叠加场环境特性与混响室场分布特性保持了一致。利用该方法,对某开缝矩形腔体的屏蔽效能进行了仿真测试,并取得了与实测数据相符的结果,其屏蔽效能约为15 d B。该方法有效避免了对混响室的精确建模,大大降低了混响室条件下相关测试仿真的难度与计算量,同时为深入分析混响室场环境特性提供了一条捷径。
