一种海底混响时间序列仿真方法研究

Research on Simulation Method for Seafloor Reverberation Time Series

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。

By considering the process of forming reverberation,a simulation frame with intuitionistic physics signification was proposed to simulate numerical results of reverberation time series.The simulation frame is essentially a real time simulation method for simulating reverberation network model.The assumption that the scatter echo from cell obeys Gauss distribution may be unreasonable,so the point scatter model methods and the cell model methods were combined in the simulation frame.On the assumption that the amount of scatters obeys Poisson distribution,an easy method for forming scatters coordinate was constructed.The simulation method based on simulating reverberation complex envelop was used for implementing simulation frame,and then,the method was applied for simulating the narrowband reverberation signal in the case of monostatic.Simulation results show the efficiency of the method.The time series data can be used to evaluate relative performance of alternative signal processing algorithms.