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混响是限制主动声纳性能的主要因素之一。人们利用接收阵的指向性来提高信号/混响比。垂直指向性可用于抑制边界混响。本文利用浅海简正波混响模型进行建模分析,通过仿真计算,研究了海底类型、海深、声速梯度对海底混响的影响。仿真结果表明:海底类型对混响影响最为严重;利用实测的平均声速建模的Pekeris信道的预测海底混响与利用实测SSP的预测海底混响相差很小;海深越深,海底混响越小,海深对海底混响的影响介于上述两种因素之间。在仿真分析的基础上,论文主要进行了浅海混响实验数据垂直指向性的建模分析。对东中国海60元垂直阵采集的混响数据进行了波束形成,并对单个水听器和部分波束的混响曲线与浅海混响模型预测数据进行了比较。经初步分析表明,实验数据与模型吻合得较好。
Reverberation is one of the main factors that limit active sonar performance. People use the receiver array directivity to improve the signal / reverberation ratio. Vertical directivity can be used to suppress boundary reverberation. In this paper, the shallow sea simple geo-reverberation model is used for modeling and analysis, and the effects of seabed type, sea depth and sound velocity gradient on the seafloor reverberation are studied through simulation calculation. The simulation results show that the seafloor type has the most serious influence on the reverberation. The predicted seafloor reverberations using the measured average sound velocity have little difference with the predicted seafloor reverberation. When the sea depth is deeper, the seafloor reverberation The effect of small, sea depth on the seafloor reverberation is in between these two factors. Based on the simulation analysis, the thesis mainly analyzes the vertical directivity of shallow reverberation experimental data. Beamforming was performed on the reverberation data collected by the vertical array of East China Sea 60 yuan and the reverberation curves of a single hydrophone and some beams were compared with those of the shallow sea reverberation model. The preliminary analysis shows that the experimental data are in good agreement with the model.