Seabed sound speed multi-step inverting method based on dual-vector hydrophone

Abstract

The invention relates to a seabed sound speed multi-step inverting method based on a dual-vector hydrophone. The method includes the steps of reestablishing a sound field green function between two points in the vertical direction through noise field vertical vibration velocity signals and extracting different multiplicity arrival structures to obtain the seabed layered structure and the relationbetween the sound speed and the thickness of each depositing layer, selecting a corresponding seabed model, and inverting the seabed sound speed through the vertical coherence characteristic of the noise field vertical vibration velocity signals. By means of the multi-step inverting method, it can be ensured that the selected seabed model is correct during inverting, and the guarantee is providedfor the accuracy of the inverting result. In addition, by means of the multi-step inverting method, the sound speed and the thickness of the seabed depositing layer can be represented with an inverting amount, the dimension of the parameter search space during inverting is reduced, and the inverting efficiency is improved.

Description

technical field [0001] The invention belongs to underwater acoustic signal processing technology, and relates to a subsea sound velocity step-by-step inversion method based on double-vector hydrophones. Background technique [0002] Ocean ambient noise is the background sound field in the ocean, which exists in the ocean all the time. The performance of any sonar device is affected by ambient noise in the ocean. Traditional underwater acoustics regards the noise signal of the ocean environment as an interference signal. The purpose of studying the noise field is to suppress noise, improve the signal-to-noise ratio, and maximize the range of sonar equipment. In fact, the ocean environment noise signal continuously interacts with the sea surface and the seabed during the propagation process, so the noise field will carry the information of the ocean environment parameters (especially the seabed parameters), so the spatial characteristics of the noise field can be used to pass...

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Problems solved by technology

[0005] The above two inversion methods assume that the layered structure of the seabed is known, but in practice, acoustic equipment such as shallow sections is needed to obtain the layered structure of the seabed, and the use of shallow sections to obtain the layered structure of the seabed requires active emission of acoustic signals. will lose the advantage of passive inversion

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