CAJ | 학술논문

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.
위료실현어뢰천해해저혼향방진,병체현어뢰운동대혼향신호적영향,제출료일충직관、역우실현적해저혼향방진방법.해방법파산생혼향적해저화분성약간산사단원,병파산사단원등개위계통,채용련속파(CW)신호화선성조빈(LFM)신호작위어뢰적주동성신호.채용해방법진행해저혼향방진,가이근거수요파산사단원화분도족구소,인차어뢰상대매개산사단원적다보륵빈이상동,종이비교준학적체현료어뢰운동대혼향신호적영향;동시,파산사단원등개위계통,가이이용권적진행혼향신호적계산.방진결과표명,해방법물리의의청석,방진간단역행,방진혼향신호적빈보특성여혼향적기본이론상부,충분험증료해방법적유효성.
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.