负梯度浅海混响条件下吊放声纳主动探测深度研究

Research on the Dipping Sonar Active Investigation Depth in Negative Gradient Shallow Water Reverberation

摘要:

负梯度浅海条件下,吊放声纳主动工作时混响呈现“峰”现象,且随吊放声纳深度变化。为此,建立浅海混响模型,采用 Bellhop模型计算吊放声纳与海底散射元之间的传播,并依据 Jackson模型推导海底反向散射强度的计算方法。结合海底散射面积的估算与吊放声纳主动工作满足小掠射角的特点,对浅海混响进行了仿真和分析。

Abstract:

Active working dipping sonar reverberation peaked at a specified time under negative gradient sound speed profile conditions in shallow water. The peak time varied according to dipping sonar investigation depth. The shallow water reverberation was modeled. Bellhop model was used to compute the reverberation propagation factor between dipping sonar and seafloor. The seafloor backscattering intensity calculation was threshed accord. ing to Jackson model. Because active dipping sonar satisfied demand of small grazing angles, combined with sea. floor backscattering area estimation, shallow water reverberation was studied and emulated.