基于运动平台的海底混响建模与仿真

Modeling and simulation of sea bottom reverberation based on moving platform

混响是主动声呐目标检测的主要干扰,混响的建模与仿真对研究水下信号处理具有重要的意义。以海底混响为研究对象,综合考虑发射信号的波形、海底散射体散射特性以及运动平台带来的多普勒频移等影响因素,提出了一种基于运动平台的海底混响仿真方法。该方法同时结合了散射原理与网络模型,具有明确的物理意义,且其仿真实现方法简单高效。最后,通过分析混响仿真信号的瞬时值、包络的概率分布、频谱特性以及时间相关性,验证了该方法对海底混响仿真的有效性。

Reverberation is the main influential factor for active target detection of sonar. Modeling and simulation of reverberation play an important role inon the underwater signal processing. A novel sea bottom reverberation simulation method for moving platform was proposed under the consideration of a variety of influential factors, such as the waveform of transmission signal, the characteristics of scattering, the Doppler frequency drift caused by the platform movement, and etc. This method combines the scatter theory and network model and has clear physical meaning, which can be efficiently realized in simulation. The proposed method shows good performance in simulating sea bottom re- verberation by analyzing the instantaneous value of the simulated reverberation signal, the probability distn＇bution of the temporal envelop, the spectral characteristics, and the temporal correlation.