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Shallow sea geoacoustic parameter inversion method based on low-frequency underwater acoustic propagation characteristics

A technology of propagation characteristics and geoacoustic parameters, applied in the directions of sound wave reradiation, special data processing applications, electrical digital data processing, etc., can solve problems such as easy reduction of work efficiency, CPU burnout, etc., to improve evaluation accuracy, eliminate The influence of various factors and the effect of high parameter accuracy

Inactive Publication Date: 2019-03-19
ZHEJIANG OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In shallow seas, the working environment of sonar is complex and changeable, and the propagation of acoustic signals is significantly affected by factors such as the seabed, the scale of the waveguide, and the hydrological conditions of the fluid. Acoustic propagation modeling and performance evaluation of underwater acoustic equipment need to know the acoustic parameters of the seabed. How to quickly and cost-effectively obtain the geoacoustic parameters of the entire test sea area is still in the blank stage in China. At the same time, the above-mentioned modeling and parameter calculation operations Computer equipment is generally used for processing, and the CPU of existing computers is prone to reduce work efficiency and even burn out the CPU after the temperature rises during the process of large amount of data calculation.

Method used

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  • Shallow sea geoacoustic parameter inversion method based on low-frequency underwater acoustic propagation characteristics
  • Shallow sea geoacoustic parameter inversion method based on low-frequency underwater acoustic propagation characteristics
  • Shallow sea geoacoustic parameter inversion method based on low-frequency underwater acoustic propagation characteristics

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Effect test

Embodiment 1

[0043] Such as figure 1 , 2 As shown, a shallow sea geoacoustic parameter inversion method based on the propagation characteristics of low-frequency underwater sound:

[0044] Use mobile terminals to acquire and / or input data and build parametric models;

[0045] Obtain the sound pressure field of the parameterized model by using the normative formula;

[0046] Use the objective function to optimize the solution to obtain the parameters of the seabed of the parametric model;

[0047] The mobile terminal stores and outputs data;

[0048] The memory and display connected to the mobile terminal are used to store and display the seabed parameters of the parameterized model obtained. The present invention selects the shallow sea parametric model with elastic seabed as the parametric model, and then uses the standard formula to obtain the sound pressure field of the parametric model, and in the parametric model, the change of the seabed sound will have a parameter influence on t...

Embodiment 2

[0061] see Figure 4 , the shallow sea geoacoustic parameter inversion method based on the low-frequency underwater acoustic propagation characteristics of the present invention and the program operation flow in the computer are as follows:

[0062] S1: Acquiring and / or inputting data, the specific data is: Let the position z=0 represent the sea surface, the sea surface downwards is the positive value direction of the depth z axis, and the r positive axis represents the outward propagation direction of the sound field; let the depth of the uniform fluid layer be H, Density ρ 1 , speed of sound c 1 , the sound source is located at depth z below the sea surface s place; the seabed is an isotropic semi-infinite medium space, and the sound speed of longitudinal wave, sound speed of transverse wave and density are respectively c p 、c s and ρ b , α p and alpha s Represent the sound velocity attenuation of the longitudinal wave and the sound velocity attenuation of the shear w...

Embodiment 3

[0069] The present embodiment further verifies the method of the present invention by experiment:

[0070] The marine environment simulation parameters are given in Table 1.

[0071] Table 1 Marine environment simulation parameters

[0072]

[0073]

[0074] Figure 9 The solid lines in (A)-(E) correspond to the calculation results of the true value parameters in Table 1, and the dotted and dashed lines respectively correspond to the calculation results of the five submarine geoacoustic parameters when they take the discussed values. Figure 9 (F) Combined with the anomaly, it gives the degree of influence on the TL curve when each parameter changes within the discussion value interval of the five submarine geoacoustic parameters. Calculated TL values ​​are regarded as discrete data to calculate anomalies.

[0075] From Figure 9 (A)- Figure 9 From the comparison of (F), it can be seen that under the premise that other simulation conditions remain unchanged, changi...

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Abstract

The invention discloses a shallow sea geoacoustic parameter inversion method based on low-frequency underwater acoustic propagation characteristics. The method comprises the following steps: acquiringand / or inputting data by adopting a mobile terminal and constructing a parameterized model; obtaining a parameterized model sound pressure field by utilizing a standard formula; Utilizing an objective function to optimize and solve to obtain each parameter of the seabed of the parameterized model; according to the method, the influence of sound field errors can be eliminated, the geoacoustic parameters of the whole test sea area can be quickly obtained at low cost, the inversion process is operated by adopting a mobile terminal, and the equipment operation stability is high.

Description

technical field [0001] The invention belongs to the technical field of marine acoustics, and in particular relates to a shallow sea geoacoustic parameter inversion method based on the propagation characteristics of low-frequency underwater sound. Background technique [0002] In the shallow sea waveguide, the limitation of the complex ocean environment on the performance of the sonar system has always been one of the challenges faced by the application of shallow sea acoustic engineering. In shallow seas, the working environment of sonar is complex and changeable, and the propagation of acoustic signals is significantly affected by factors such as the seabed, the scale of the waveguide, and the hydrological conditions of the fluid. Acoustic propagation modeling and performance evaluation of underwater acoustic equipment need to know the acoustic parameters of the seabed. How to quickly and cost-effectively obtain the geoacoustic parameters of the entire test sea area is stil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01S15/88
CPCG01S15/88G06F30/20
Inventor 祝捍皓肖瑞朱军郑广学汤云峰陈超赵益智张念念杨昕王文杰蒋嘉豪
Owner ZHEJIANG OCEAN UNIV
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