A Depth-Correlation Method for Velocity Inversion of Internal Soliton Waves

This paper proposes a depth-correlation method for velocity inversion of internal soliton waves (ISWs). ISWs can cause perturbation of acoustic field when propagating along acoustic path, which can be represented by coupled modes. According to Dyson Series, the coupling frequency is related to the velocity of ISWs, and the vertical structures of acoustic perturbation spectrum at positive and negative coupling frequencies are consistent with the mode depth function of a pair of coupled modes, respectively. This information can be used to estimate the velocity of ISWs by a depth-correlation method. There are two cases in simulation: (1) constant velocity; (2) time-varying velocity. The validity of the method is verified by simulation results.