Deep-sea direct sound area target depth estimation method based on deep neural network

Abstract

The invention provides a deep-sea direct sound area target depth estimation method based on a deep neural network, and the method comprises the steps: carrying out the FFT processing of time-array element domain data obtained through the actual measurement of a vertical array, and obtaining frequency-array element domain data; performing conventional beam forming processing on the frequency-array element domain data after frequency domain normalization processing to obtain a beam response matrix of a frequency-glancing angle domain; and inputting the wave beam response matrix of the frequency-glancing angle domain into a pre-trained deep neural network, and outputting a sound source depth estimation result. The method provided by the invention can overcome the limitation of the multi-spectrum depth estimation method by the frequency band width and the array aperture; and the accuracy of depth estimation is obviously higher than that of a deep neural network estimation method with input data being frequency-depth sound pressure field data and a traditional sound source depth estimation method, and the relative error is the lowest.

Description

technical field [0001] The invention relates to the field of underwater acoustic physics, in particular to a method for estimating the depth of a target in a deep-sea direct sound region based on a deep neural network. Background technique [0002] The depth of the broadband sound source in the deep-sea direct wave region can be estimated by the Multispectral Depth Estimation Method (MSDE Method). This method is based on the point source interference sound field based on the constant sound velocity model, and based on the analysis of the interference spectrum of the array receiving frequency domain signal, Fourier transform, beamforming and improved Fourier transform cubic signal spectrum are respectively performed on the original signal Analysis, there is no need to predict the motion state of the sound source, and the beamforming result also has a certain ability to resist spatial noise interference. However, it is difficult to give an accurate solution to the point sourc...

AI Technical Summary

Problems solved by technology

However, it is difficult to give an accurate solution to the point source interference structure in the actual hydrological environment, and the solution results at constant sound velocity may lead to errors in estimating the depth of the sound source

Images