基于参考点之间水声传播的声速剖面反演

针对海洋声速剖面测量成本高、长期观测困难的难题，文章初步研究了利用水下固定参考点与水面已知位置之间的声信号传播时延来反演海水声速剖面的方法，提出了一种等声速分层模型下的声速剖面反演方法。将海水分层，对声信号传播过程进行建模，推导反演声速的非线性方程组；再利用牛顿迭代法，对非线性方程组进行求解。通过仿真和海试试验数据处理，分层数不同时，反演声速与实际声速之间的误差随着分层数的增加而变小，声速误差最小为0.80 m·s^-1左右，验证了反演方法的有效性与准确性。

Sound velocity profile inversion based on underwater acoustic propagation between reference points

In view of the high cost of ocean sound velocity profile measurement and the difficulty of long-term observation, the method using the sound signal propagation time delay between a fixed underwater reference point and a known position on the water surface to invert the ocean sound velocity profile is studied. A sound velocity profile inversion method based on the isosonic layered model is proposed. The seawater is layered, the sound signal propagation process is modeled, and the non-linear equations for inverting the sound velocity are derived. Then the Newton iteration method is used to solve the non-linear equations. Through simulation and sea trial data processing, it is shown that for different numbers of layers, the error between the inverted sound velocities and the actual sound velocities become smaller with the increase of the number of layers. The minimum error is about 0.80 m·s^-1, which verifies the effectiveness and accuracy of the inversion method.