摘要
为了实现鱼雷浅海海底混响仿真,并体现鱼雷运动对混响信号的影响,提出了一种直观、易于实现的海底混响仿真方法。该方法把产生混响的海底划分成若干散射单元,并把散射单元等价为系统,采用连续波(CW)信号和线性调频(LFM)信号作为鱼雷的主动声信号。采用该方法进行海底混响仿真,可以根据需要把散射单元划分到足够小,因此鱼雷相对每个散射单元的多普勒频移相同,从而比较准确的体现了鱼雷运动对混响信号的影响;同时,把散射单元等价为系统,可以利用卷积进行混响信号的计算。仿真结果表明,该方法物理意义清晰,仿真简单易行,仿真混响信号的频谱特性与混响的基本理论相符,充分验证了该方法的有效性。
To simulate the torpedo reverberation on shallow seafloor and reveal the effect of torpedo motion on the re- verberation signal, a seafloor reverberation simulation method is presented. In this method, the seafloor generating re- verberation is divided into several scattering units, and each scattering unit is equivalent to a system. Continuous wave（CW） signal and linear frequency modulation（LFM） signal are taken as torpedo active acoustic signal. In seafloor reverberation simulation, the scattering units can be small enough to keep the Doppler frequency shift produced by tor- pedo motion in each scattering unit is the same, thus the effect of torpedo motion on reverberation signal is revealed. Because each scattering unit is equivalent to a system, convolution can be used to compute reverberation signal. Simula- tion results show that the present method is of clear physical meaning and simple calculation. Moreover, the spectrum characteristic of the simulated reverberation signal is consistent with the basic theory of reverberation, verifying the validity of the method.
出处
《鱼雷技术》
2013年第2期100-104,共5页
Torpedo Technology
基金
国家自然科学基金(51179157)
国家自然科学基金(51179158)
关键词
鱼雷
浅海海底混响
散射单元
多普勒频移
torpedo
shallow seafloor reverberation
scattering unit
Doppler frequency shift
