高速运动声呐海底宽带混响建模与仿真  

Subsea Broadband Reverberation Modeling and Simulation of High-speed Motion Sonar

作　　者：杨佳宜 杨云川 李永胜 石磊 杨向锋 YANG Jiayi;YANG Yunchuan;LI Yongsheng;SHI Lei;YANG Xiangfeng(The 705 Research Institute,China State Shipbuilding Corporation Limited,Xi’an 710077,China)

机构地区：[1]中国船舶集团有限公司第705研究所,陕西西安710077

出　　处：《水下无人系统学报》2023年第2期285-290,共6页Journal of Unmanned Undersea Systems

摘　　要：海底混响是鱼雷在声速近似满足负梯度分布的浅海水域进行目标探测时的主要干扰源。为了准确、便捷、可复现地获得混响信号,并研究其统计特性,文中提出一种基于Bellhop模型的高速运动声呐海底宽带混响仿真方法。该方法先将对混响有贡献的海底区域划分为若干个不均匀的散射单元,计算每个单元的散射特征函数,其中传播损失通过Bellhop模型计算;再基于网络模型仿真得到包含幅值、相位与多普勒频移等主要影响因子的海底混响模拟信号。最后,对仿真信号与实航信号进行时频域分析及相似性比较。结果表明,以仿真信号与实测数据瞬时值的概率密度分布的点积比为评价标准,文中的方法与实航数据相似度明显提高,验证了模型的有效性。Subsea reverberation is the main source of interference when torpedoes detect targets in shallow waters where thesound velocity approximately satisfies the negative gradient distribution.In order to obtain the reverberation signal accurately,conveniently and reproducibly,and study its statistical characteristics,this paper proposes a high-speed motion sonar subseabroadband reverberation simulation method based on the Bellhop model.In this method,the seabed area that contributes to thereverberation is divided into several non-uniform scattering units,and the scattering characteristic function of each unit iscalculated.The propagation loss is calculated by the Bellhop model.Subsea reverberation analog signal with main influencingfactors such as doppler shift.Finally,the time-frequency domain analysis and similarity comparison between the simulatedsignal and the actual flight signal are carried out.The results show that using the dot product ratio of the probability densitydistribution of the instantaneous value of the simulated signal and the measured data as the evaluation standard,the similaritybetween the method in this paper and the actual flight data is greatly improved,which verifies the validity of the model.

关 键 词：鱼雷 海底混响 运动平台 Bellhop模型 单元散射模型 

分 类 号：TJ630.34[兵器科学与技术—武器系统与运用工程]