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针对海底混响时间序列的数值仿真问题,结合混响信号形成过程,提出了物理意义清晰的仿真框架,仿真框架本质上是对混响网络模型的实时仿真。鉴于网络模型方法中假设单元散射回波服从高斯分布存在的不合理性,仿真框架中综合运用了点散射方法与单元散射方法。另外,为了提供仿真框架中所需的点散射体,在泊松分布假设条件下,设计了易于实现的散射体坐标向量生成方法。最后,针对仿真框架的具体实现,提出了一种限定采样频率的复包络混响信号仿真方法,并将该方法应用到收发合置情况下的窄带混响信号仿真,仿真结果显示了方法的有效性。仿真数据可用于测试声呐系统中信号处理方法的性能。
Aimed at the numerical simulation of seabed reverberation time series, a real-time simulation framework is proposed based on the formation of reverberation signals. The simulation framework is essentially a real-time simulation of the reverberation network model. In view of the irrationality of assuming Gaussian distribution of scattering scatterers in the network model method, the point scatter method and the unit scattering method are comprehensively used in the simulation framework. In addition, in order to provide the necessary point scatterers in the simulation framework, an easy-to-implement scatterer coordinate vector generation method is designed under the Poisson distribution assumption. Finally, aiming at the concrete realization of the simulation framework, a simulation method of complex envelope reverberation signal with limited sampling frequency is proposed, and the method is applied to the narrow-band reverberation simulation under the condition of receiving and transmitting. The simulation results show that Effectiveness. Simulation data can be used to test the performance of signal processing methods in sonar systems.