Single-vector hydrophone sound source depth estimation method based on multipath feature matching

Abstract

The invention discloses a single-vector hydrophone sound source depth estimation method based on multipath feature matching. The method comprises the steps of receiving a broadband sound pressure of target radiation and a time domain signal of a three-component particle vibration velocity, and processing the time domain signal to obtain acoustic energy flows in x, y and z directions and a sound field intensity spectrum after mean removal; estimating a target azimuth angle by utilizing the acoustic energy flows in the x direction and the y direction and synthesizing a horizontal acoustic energyflow; calculating an estimated value of a target arrival angle according to the ratio of the acoustic energy flow in the z direction to the horizontal acoustic energy flow; carrying out double spectrum analysis on the sound field intensity spectrum subjected to mean value removal by utilizing spectrum analysis to obtain a multipath time delay estimation value; calculating multipath time delay template values corresponding to different sound source depths under the arrival angle according to the estimated value of the target arrival angle in combination with the sound velocity profile; and calculating a difference value between the multipath time delay estimation value and the multipath time delay template values under different sound source depths, and taking the depth corresponding to the multipath time delay template value with the minimum difference value as a target sound source depth estimation value.

Description

technical field [0001] The invention belongs to the technical field of underwater acoustic detection and sonar, and in particular relates to a single-vector hydrophone sound source depth estimation method based on multi-channel feature matching. Background technique [0002] Depth estimation of deep-sea targets is one of the hot and difficult issues in underwater acoustic research in recent years. Existing depth estimation methods include matching field method, depth determination method based on multipath arrival delay or interference fringe. The matching field processing method is sensitive to parameters such as ocean environment parameters and array tilt. For deep sea environments, the search range is large, the amount of calculation is large, and it takes a long time. The system configuration needs to be a large-aperture array comparable to the sea depth, which has poor applicability in deep sea conditions. . [0003] In the deep-sea direct sound area, the direct wave ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the above-mentioned technical defects, and propose a single-vector hydrophone sound source depth estimation method based on multi-channel feature matching, so as to solve the problem that the sound source depth estimation in the existing deep sea environment requires a vertical line array and a large amount of calculation. , only applicable to problems such as the near horizontal distance of the direct sound area

The present invention solves the problem that the traditional method requires a vertical line array and a large amount of calculation by using the following properties: the ratio of the vertical acoustic energy flow and the horizontal acoustic energy flow obtained by the single-vector hydrophone directly estimates the target angle of arrival, thereby eliminating the need for vertical The azimuth spectrum of the linear array is estimated, which greatly reduces the amount of calculation and system configuration requirements; on the other hand, it only needs to calculate the multi-path delay or frequency-domain interference period template value corresponding to different hypothetical sound source depths under a single estimated arrival angle , instead of calculating the simulated sound field in the entire distance and depth two-dimensional space, which reduces the amount of system calculation

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