Reliable acoustic path-based deep sea earthquake sound parameter inversion method

A geo-acoustic parameter and sound path technology, applied in the fields of hydroacoustic engineering, ocean engineering and sonar, can solve the problems of inconspicuousness and inaccurate near-field calculation, and achieve the avoidance of use, a wide range of glancing angles, and the scale of submerged objects. small effect

Active Publication Date: 2018-06-19
NORTHWESTERN POLYTECHNICAL UNIV
View PDF3 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inversion of normal wave modal dispersion characteristics can obtain high-resolution seafloor parameters, but this characteristic i

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Reliable acoustic path-based deep sea earthquake sound parameter inversion method
  • Reliable acoustic path-based deep sea earthquake sound parameter inversion method
  • Reliable acoustic path-based deep sea earthquake sound parameter inversion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0039] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0040] This embodiment figure 1 The sound velocity profile of the experimental sea area extracted from the Simple Ocean Data Assimilation database is given, and the water depth is 5300m. figure 2 is the geometric configuration diagram of the system in the experiment. The hydrophone is placed at a water depth of 5050m. To illustrate the physical principles of the present invention, image 3 Given the sea depth of 5300m, the propagation loss at a depth of 50m varies with the horizontal distance when using different seabed sound velocities, densities and attenuation coefficients calculated by BELLOP. play an important role. Figure 4 The reflection loss model OASR based on wavenumber integration is used to calculate the "interference" phenomenon between the layers that occurs with frequency when the sea bottom reflection loss occurs with frequency when two laye...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A reliable acoustic path-based deep sea earthquake sound parameter inversion method of the present invention comprises the steps of firstly arranging a single hydrophone nearby the seabed below a deepsea critical depth, enabling a ship to sail only in a survey sea area, at the same time, emitting a sound source signal, and acquiring the deep sea experiment data; using a receiving hydrophone to obtain a multi-path signal nearby the seabed below the critical depth by utilizing a sound source target, analyzing and extracting the multi-path information of a direct wave and a seabed reflected wave, calculating the seabed reflection loss changing along with the grazing angles, and finally matching the seabed reflection loss simulated by a model, and inverting to obtain a seabed parameter. Compared with the prior art, the deep sea earthquake sound parameter inversion method has the superiority of not needing a large aperture array and being convenient to arrange. By utilizing a stable physical phenomenon that the interference occurs between the layers at the seabed at different frequencies, and by the experiment data processing and the seabed modeling and simulation, the seabed earthquake sound parameter of a large depth sea area is obtained by inverting, the signal to noise ratio of the experiment data obtained in the present invention is high, and the robustness of the inversion method is good.

Description

technical field [0001] The invention belongs to the fields of underwater acoustic engineering, marine engineering, sonar technology, etc., and relates to a deep-sea geoacoustic parameter inversion method based on a reliable acoustic path, a method for inverting geoacoustic parameters by using seabed reflection loss, and is suitable for deep-sea environments . Background technique [0002] Geoacoustic parameters such as sound velocity c, attenuation coefficient α, density ρ, and layered characteristics h of the seabed are very important in sound field forecasting and target positioning. In the deep sea environment, it is very difficult to measure geoacoustic parameters in situ, and it is necessary to find new methods to obtain geoacoustic parameters. A variety of methods have been used for the inversion of geoacoustic parameters, such as matching field inversion, propagation loss and waveform matching inversion, normal wave modal dispersion characteristic inversion, bottom r...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01V1/28
CPCG01V1/28G01V1/282G01V2210/679G01V2210/70
Inventor 杨坤德徐丽亚段睿刘鸿杨秋龙
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap