一种舰船声尾流回波信号建模方法

A Modeling Method of Ship Acoustic Wake Echo Signal

通过声尾流回波信号模型构建仿真数据是研究舰船尾流的重要方式。文中针对已有模型忽略单个气泡散射回波的不足,提出了一种分区域点散射模型。该模型首先依据不同舰船尺寸、航行速度和海况确定尾流几何模型,进而根据气泡尺寸分布划分尾流为不同散射区域;然后根据收发平台的波束宽度、位置和发射角度确定尾流自导系统作用范围;最后划分尾流自导系统作用范围为有限散射单元,综合考虑传播损失后根据点散射模型计算尾流散射回波信号。仿真和水箱实验结果表明,文中所提模型可用于舰船尾流仿真,并为进一步开展尾流检测和识别提供支撑。

It is an important way to study the ship wake by building simulation data through the acoustic wake echo signal model.At present,the scattering echo of a single bubble is ignored in the existing models.Therefore,a point scattering model for different regions was proposed in this paper.Firstly,the wake geometry model was determined according to the ship size,speed,and sea condition,and then the wake was divided into different scattering regions according to the bubble size distribution(BSD).The range of the wake homing system was determined according to the beam width,position,and launch angle of the transmitting and receiving platform.Finally,the range of the wake homing system was divided into finite scattering elements,and the scattering echo signal was calculated according to the point scattering model after considering the propagation loss.The results of simulation and water tank experiments show that the model can be used in ship wake simulation and provide support for further wake detection and identification.