Submarine sound velocity passive access method based on noise field vertical vibration velocity signal

Abstract

The invention relates to a submarine sound velocity passive access method based on a noise field vertical vibration velocity signal. The method comprises the steps that a marine environment noise field vector signal vertical coherent characteristic prediction model is built, aiming at three elements of inversion, an optimization algorithm, forward modeling and a cost function, a submarine sound velocity inversion model based on noise field vertical vibration velocity signal vertical coherent characteristics is given, and noise field vertical coherent characteristics are selected for conductinginversion of the submarine sound velocity. Accordingly, seawater acoustic parameters can be obtained through actual measurement, by means of a submarine geological database, geology types of the experimental seafloor can be obtained roughly, the search range of submarine parameters can be determined through table look-up, by means of a genetic algorithm, the best agreement of noise field verticalcoherent characteristic results and measured results under a group of ground acoustic parameters, and the parameters can be approximatively considered as actual submarine earth sound parameters.

Description

technical field [0001] The invention relates to a passive acquisition method of seabed sound velocity based on a noise field vertical vibration velocity signal. Only two vertical vibration velocity hydrophones are needed to realize accurate acquisition of seabed sound velocity. The simulation results show that: compared with the sound pressure signal of the noise field, the vertical vibration velocity signal of the noise field can be inverted to obtain a more accurate seabed sound velocity. Background technique [0002] my country's continental shelf stretches for thousands of kilometers, and most of the sea areas are shallow seas. The hydrological parameters of the shallow seas and the submarine geoacoustic parameters have a great influence on the sound propagation process, especially the seabed sound velocity will significantly affect the long-range propagation of shallow sea sound waves, thus affecting the underwater affect the performance of the equipment. Therefore, obt...

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Problems solved by technology

[0012] The accuracy of the geoacoustic parameters obtained by the active inversion method is generally high, but the active acquisition method has the following defects: the active sound source is required to emit signals, which will cause acoustic pollution to the ocean and may cause harm to marine life; the active sound source It consumes a lot of energy, and deployment and recovery are relatively cumbersome, and the cost of acquisition is high; it is not concealed, and cannot be implemented in disputed sea areas and combat sea areas

The passive inversion method does not have the above three problems. At present, there are two main methods for passive acquisition of geoacoustic parameters based on marine environmental noise: one is to use the vertical directivity of the noise field for inversion. The sound pressure line array of array elements is realized. The cost of the line array is relatively high and it is relatively difficult to deploy and recycle.

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