Method and system for forecasting ocean vector sound field and medium

Abstract

The invention discloses a method and system for forecasting an ocean vector sound field and a medium. The method comprises the steps: S1, obtaining the field measurement data and sound source parameter information of a to-be-forecasted ocean region, building a cylindrical coordinate system underwater sound Helmholtz equation, and obtaining a depth equation after transformation; S2, solving a depthequation to obtain a sound pressure kernel function and a vertical vibration velocity kernel function of each dielectric layer interface; S3, calculating the sound pressure according to the sound pressure kernel function, calculating the vertical vibration velocity by using a vertical derivative based on an Hankel inverse transformation integral formula according to the vertical vibration velocity kernel function, and calculating the horizontal vibration velocity based on a horizontal derivative of the Hankel inverse transformation integral formula; and S4, according to the solved sound pressure and vibration velocity vector, calculating a water sound propagation loss and sound intensity vector of the to-be-forecasted ocean area. The method can achieve the prediction of the vibration velocity vector based on the marine environment measurement data, and can improve the prediction precision 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, system and medium for forecasting ocean vector sound field. Background technique [0002] Acoustic waves are currently the main means of underwater communication, marine environment and target detection, and have important application values ​​in military and economic fields. The receiving sensor of underwater sound waves is generally called a hydrophone. Traditional hydrophones are scalar hydrophones, which can only measure scalar parameters (such as sound pressure) in the sound field. The current relatively 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] Since factors such as seabed topogra...

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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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