混响背景下双基地声呐的探测范围分析

为了讨论混响对双基地声呐探测范围的影响,利用经验证的三维散射模型,讨论在不同入射、散射掠射角和散射方位角约束下的海底散射强度分布.根据双基地配置的几何特性,分析对混响有贡献的界面散射面积.以浅海为例分析比较不同基线长度时,混响与噪声限制下不同位置的目标在接收基地阵元输入端所形成的信干比.结果表明,混响限制下,双基地声呐的探测范围与混响强度相关.由于面临较强前向散射和侧向散射的影响以及直达波的强干扰,在近距离上,将出现探测盲区.

Analysis of detectable region for the bistatic sonar in reverberation background

The distribution of sea-floor scattering strength held in the incident grazing angle,scattering graze angle,and scattering azimuthal angle was analyzed using a 3-D model that was validated.A mathematical model of the area contributing to the reverberation was derived.Quantitative analysis was made by accounting for bistatic reverberation and mask effect of the "direct blast." The signal-to-interference at receiver was determined and the detectable area for the different bistatic configuration may be examined.Results show that in reverberation background,the detectable region of bistatic sonar is related to reverberation strength,and there is a mask region within it due to the influence of forward(in-plane) and out-of-plane scattering.