A method, system and medium for improving the accuracy of ocean sound field prediction

Abstract

The invention discloses a method, a system and a medium for improving the prediction accuracy of an ocean sound field. The method steps include: step S1. Acquire on-site measurement data of the ocean water sound field to be measured and parameter information of the sound source, and establish a horizontal layered ocean environment. The underwater acoustic Helmholtz equation in the cylindrical coordinate system is transformed to obtain the depth equation; step S2. establish the sound vector of the upper and lower boundaries of the sound field; step S3. transfer the sound vector from the upper and lower boundaries to the middle depth respectively; step S4. in the middle Establish the sound vector equation in depth, and solve the vertical vibration velocity of the upper and lower boundaries, and calculate the sound pressure wavenumber kernel function of each layer; Step S5. Perform horizontal wavenumber integration on the sound pressure wavenumber kernel function to obtain the sound pressure value of the receiving depth; step S6. Calculate the propagation loss curve of the receiving depth to realize the prediction of the ocean sound field to be measured. The invention can realize sound field prediction based on marine environment measurement data, and can improve the accuracy of ocean sound field prediction at the same time.

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 improving the accuracy of ocean sound field prediction. Background technique [0002] Acoustic waves can travel long distances in the seawater medium, and are currently the main information carriers for underwater acoustic communication, seawater and submarine environment detection, and underwater target positioning. They have important application values ​​in the military and economic fields. Since the underwater sound propagation characteristics are closely related to the sound velocity and density distribution of seawater and sedimentary layers, it is generally necessary to establish an appropriate underwater acoustic model to describe the relationship between the sound pressure variable and the acoustic parameters of the environmental medium and the sound source parameters, and use a computer to carry out Finally, t...

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Problems solved by technology

However, the above traditional methods have great shortcomings when used in deep sea conditions, especially when the sound source is close to the sea surface, the distance from the lower boundary acoustic vector to the depth of the sound source is very far, and the calculation stability is poor (horizontal wave number exceeds The calculation interruption occurs soon after the wave number of the medium), which leads to a large error in the integral calculation of the sound pressure wave number at the depth near the sound source, thereby reducing the prediction accuracy of the sound field

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