论文部分内容阅读
简正波群速度广泛应用于海底参数反演,海深不确定性对反演结果有较大影响。为了减小海深测量误差对反演结果的影响,本文通过理论分析和仿真计算对Pekeris声波导情况下正则简正波群速度随海深和海底声速的变化规律进行研究,结果表明当所选取的频率处于某号简正波的Airy频率附近时,该号简正波的群速度对海深变化不敏感,而比同频率的低号简正波的群速度受海底声速的影响更大。将这一变化规律应用于由简正波群速度反演海底声速,仿真与实验结果表明,应用Airy频率附近的简正波的群速度反演海底声速,能有效克服海深不确定性对反演结果的影响。
The simple normal wave group velocity is widely used in the inversion of seafloor parameters. The uncertainty of sea depth has a great influence on the inversion results. In order to reduce the influence of the sea depth measurement error on the inversion results, this paper studies the regularity of regular normal wave group velocity with sea depth and sea floor sound velocity under the condition of Pekeris acoustic waveguide through theoretical analysis and simulation. The results show that when the selected frequency is at When a certain normal frequency is near Airy frequency, the group velocity of simple normal wave is not sensitive to the sea depth change, while the group velocity of low-order simple normal waves with the same frequency is more affected by the speed of sound at sea floor. This variation law is applied to the inversion of seafloor sound velocities by simple normal swarm velocities. The simulation and experimental results show that the inversion of seafloor sound velocities by the group velocity of normalized waves near Airy frequency can effectively overcome the influence of sea depth uncertainty on the inversion results .