摘要
针对实际海底环境的分层介质特性,建立了一种适用于任意阵型的分层海底空时混响模型。充分考虑了多普勒频移、散射体方位、海底沉积层与基层的不均匀性、以及海水与沉积层界面对混响形成的影响,将所有散射信号在接收阵元处叠加,得到单通道混响的输出,从而建立了更加符合复杂海底环境的混响空时模型。以连续波(CW)信号作为发射信号对建立的混响模型进行了仿真,所得到混响的时域特性和2D空时特性符合理论分析,验证了该海底空时混响模型的有效性和准确性。
Considering the layered medium in the seafloor environment, a reverberation space-time model adapted to the arbitrary array was established for the layered seafloor. The impacts of the Doppler shift, the direction of scattering body, the inhomogcneity of sediment and basement, and the sediment-water interface on the reverberation were considered in the model, All the received scattering signals were superposcd at the array element to form the single channel output of the reverberation. The proposed space-time model of the reverberation was adapted to the complex seafloor environment The reverberation of continuous wave（CW） signal was simulated using this model. By comparing the characteristics of the simulated reverberations in time domain and 2D space-time domain with the theoretical expectation, the validity and accuracy of the proposed reverberation space-time model arc proved.
出处
《鱼雷技术》
2015年第6期414-419,共6页
Torpedo Technology
基金
国家自然科学基金(61379007)
关键词
海底混响
任意阵型
分层海底
空时模型
seafloor reverberation
arbitrary array
layered seafloor
space-time model
