【摘要】 研究海底混响特性问题,海底混响是声纳设备在浅海海域进行水下探测、通信和导航中遇到的主要干扰信号。为了有效识别水中混响特征,提出了一种海底混响模型,用仿真软件为实现抗混响提供较完整的依据。采用划分散射单元,得到包含相位信息、多普勒频移信息等主要影响混响形成具有空时特性的海底混响模型,能广泛适用于各种阵列,并推导了任意阵型的阵列信号输出模型,采用带通采样技术在matlab上进行仿真,结果表明,实现了混响模型的瞬时值和包络值的概率密度分布、频谱、空时特性等。表明了仿真特性能够为抗混响研究提供依据。更多还原

【Abstract】 A simulation model of seafloor reverberation was studied in this paper.When sonar works in underwater target detection,communication and navigation in seafloor of shallow sea,seafloor reverberation are one of the most mainly disturb.This paper introduced the software which imitated the flow of seafloor reverberation for reverberation suppression.In this model,by dividing seafloor into many scattering units,an accurate seafloor reverberation model can be obtained that included the main factors of the reverberation(such as the phase and Doppler information) and the space-time characteristic.The model can be widely applied to various arrays by deriving signal output model of an arbitrary array.However,the numerical calculation for the model was complicated.By using bandpass sampling to reduce the amount of calculations,an exact real-time model was derived on the premise of maintaining accuracy and feasibility of the original model.At last,the paper simulated the reverberation data’s scattering strength,probability density distributions of transient value and envelope,spectrum and space-time characteristic.The validity of the simulation model of seafloor reverberation is proved and the simulated data can meet the need of the research on reverberation suppression.更多还原