Sound velocity profile inversion method based on over-complete dictionary

An over-complete dictionary and sound velocity profile technology, which is applied in the reradiation of sound waves, character and pattern recognition, and pattern recognition in signals, can solve problems such as poor accuracy of sound velocity profiles, and achieve improved accuracy, high reconstruction accuracy, and flexible training data Effect

Active Publication Date: 2020-02-25
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

[0007] The purpose of the present invention is to provide a sound velocity profile inversion method based on an overcomplete dictionary in order to overcome the deficiencies in the prior art, which is used to solve the technical problem of poor accuracy of the sound velocity profile obtained by the existing method

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  • Sound velocity profile inversion method based on over-complete dictionary
  • Sound velocity profile inversion method based on over-complete dictionary
  • Sound velocity profile inversion method based on over-complete dictionary

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[0051] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0052] In order to prove the effectiveness of the sound velocity profile inversion method based on an over-complete dictionary in improving the accuracy of the sound velocity profile inversion, the following seas in northeastern Arabia (range 14-19°N, 65-70°E) were selected as the experimental sea area in 2011 - Calculate the sound velocity profile data in the Argo profile sequence in September in 2017, in which M=224 sound velocity profiles from ...

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Abstract

The invention discloses a sound velocity profile inversion method based on an over-complete dictionary, and the method comprises the steps: 1), constructing a non-orthogonal and over-complete dictionary D of a sound velocity profile based on a K-SVD algorithm according to historical data; 2) linearizing the nonlinear response of the forward model by using a first-order Taylor expansion, and creating a measurement matrix Q; 3) laying a single sound source and a vertical array in a sea area to be measured, and transmitting and receiving signals; 4) based on an OMP algorithm, inverting a sparse coefficient vector X of the over-complete dictionary atoms; and 5) calculating the sound velocity profile according to the time-varying non-orthogonal dictionary atomic coefficient obtained by inversion. Compared with a method based on an empirical orthogonal function, the method is based on an over-complete dictionary, the intrinsic characteristics of the sound velocity profile can be better captured through redundancy characteristics, and the inversion precision of the sound velocity profile is greatly improved.

Description

technical field [0001] The invention relates to a sound velocity profile inversion method using sound waves, in particular to a sound velocity profile inversion method based on an overcomplete dictionary, belonging to the technical field of marine environment parameter inversion. Background technique [0002] Acoustic waves are an effective carrier for transmitting information in the ocean and an important means of detecting marine environmental information. How to use acoustic signals to detect marine environmental information has been widely studied. The propagation of sound waves in the ocean is closely related to the physical processes in the ocean, and the process of sound propagation contains a wealth of ocean temperature field and flow field distribution information. Using ocean acoustics technology to extract these parameter information can realize long-term and large-scale dynamic real-time monitoring of the marine environment. [0003] Compared with other inversi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F17/16G01S7/539G01S15/89
CPCG06F17/16G01S15/89G01S7/539G06F2218/22
Inventor 李倩倩李宏琳罗宇郑炳祥施剑
Owner SHANDONG UNIV OF SCI & TECH
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