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

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...

AI Technical Summary

Problems solved by technology

The inversion of normal wave modal dispersion characteristics can obtain high-resolution seafloor parameters, but this characteristic is not obvious in deep sea environments, and the near-field calculation of normal wave models is inaccurate when the water depth is large

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