浅海海底单参数快速反演模型研究

Single parameter rapid inversion model of shallow water

根据大量观测数据中小掠射角下反射损失随掠射角近似线性增长的规律,提出以反射损失随掠射角的变化率FdB为反演单参数。利用海底密度等基本参数拟合出单参数FdB,证实单参数假设合理且能反映海底性质。利用简正波理论推导了单参数对浅海平均声场结构的控制公式,确定各个过渡距离和最佳反演尺度。利用接收声信号距离和信号延时的关系,获得了波形衰减规律,为反演声信号中提取底质信息提供了依据。获得的结果证实了单参数反演是可行的,并为下一步的反演研究提供了支持。

According to a large number of observations that bottom loss increases linearly with the grazing angle under the condition of small grazing angle, the bottom loss gradient FdB is proposed for single parameter inversion, and FdB can be fitted out from basic sediment parameters. The average sound intensity described by FaB is derived with the normal mode approach. Four propagation regions are divided and the appropriate distance for inversion is determined. By using the relationship between distance and signal delay at receiver, the rules of the wave attenuation is obtained. The results of this paper can inverse FaR from acoustic signal, which lay the foundation for further single parameter inversion research.