A method, system and medium for predicting ocean vector sound field

Abstract

The invention discloses a method, a system and a medium for predicting an ocean vector sound field. The method steps include: S1. Acquiring on-site measurement data and sound source parameter information of an ocean area to be predicted, establishing a cylindrical coordinate system hydroacoustic Helmholtz equation, and after transformation Obtain the depth equation; S2. Solve the depth equation to obtain the sound pressure kernel function and vertical vibration velocity kernel function at the interface of each medium layer; S3. Calculate the sound pressure according to the sound pressure kernel function, and use the inverse Hankel transform based on the vertical vibration velocity kernel function. The vertical vibration velocity is calculated by the integral vertical derivative, and the horizontal vibration velocity is calculated based on the integral horizontal derivative of the Hankel inverse transformation; S4. According to the calculated sound pressure and vibration velocity vector, calculate the underwater acoustic propagation loss and Sound intensity vector. The invention can realize the prediction of the vibration velocity vector based on the marine environment measurement data, and at the same time can improve the precision of the prediction of the vibration velocity vector.

Description

technical field [0001] The invention relates to the technical field of underwater sound field detection, in particular to a method, a system and a medium for predicting an ocean vector sound field. Background technique [0002] Acoustic waves are the main means of underwater communication, marine environment and target detection, and have important application value in military and economic fields. The receiving sensors of underwater sound waves are generally called hydrophones, and traditional hydrophones are scalar hydrophones, which can only measure scalar parameters (such as sound pressure) in the sound field. At present, the more advanced hydrophone is the vector hydrophone, which can measure both scalar parameters and vector parameters in the sound field (such as particle vibration velocity, referred to as vibration velocity), which is of great significance for improving the performance of underwater detection systems. [0003] Due to the seabed topography, marine env...

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Problems solved by technology

[0005] (1) The grid spacing of the sound field is limited by the finite difference method

In order to ensure the correctness of the derivative difference calculation, the grid spacing needs to be small enough (the sound pressure value does not change much in the interval between adjacent grid points), and the grid spacing in each direction generally takes several minutes of the reference wavelength. One (for example, take one tenth), in the case where only a few spatial positions around the hydrophone need to be calculated, this restriction will have an adverse effect on the calculation amount of the sound field vector and the flexibility of the calculation method

[0006] (2) Calculating the sound pressure derivative by the finite difference method will introduce additional numerical errors

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