浅海水平线阵接收海底混响序列仿真

Simulation of reverberation sequence received by horizontal array in shallow water

混响序列仿真作为海上实验的替代手段,可为声呐设计及抗混响技术研究提供数据支撑。借助简正波理论研究海底散射声场,将海底散射场视为海洋传输网络形成的传递函数,在此基础上将海底散射微元按方位角均匀划分,依据阵元间的相位关系给出了水平线阵接收海底混响序列的仿真方法。以负梯度浅海环境为例进行了混响仿真,并对仿真序列的频谱特征、统计特征、空间相关特征进行了验证,结果表明该方法获得的混响序列特性与理论预测相符,可以为抗混响技术研究提供参考。

As an alternative means of experiments at sea, reverberation signal simulation supports the studies on sonar design and anti-reverberation techniques. In this paper, scattering acoustic field of seabed in shallow water is studied by means of normal-mode method, which is treated as a transfer function formed by ocean transmission network. On this basis, scattering region is divided into many cells according to azimuth angles, and the phase differences between seabed cells are taken into account. Then, a simulation method of reverberation sequence received by horizontal array is put forward. Finally, the method is illustrated in the case of shallow water with negative gradient and the results show that the spectrum characteristics, statistical characteristics and spatial correlation characteristics of simulation signals are in accordance with theoretical predictions, which are useful for the research on anti-reverberation techniques.