Seabed acoustic array formation estimation method by using sound field interference characteristics

Abstract

The invention belongs to the field of underwater acoustic detection, underwater acoustic positioning, sonar technology and the like, and relates to a seabed acoustic array formation estimation method by utilizing sound field interference characteristics. According to the method, corresponding time for a sound source to achieve each hydrophone at the seabed at the same distance is obtained through a sound field interference structure formed by single-frequency continuous signals of a known sound source position so as to construct equations, and formation estimation of a seabed shore array is performed. When the aperture of the array is larger, the sound field interference effect received by each hydrophone is more obvious, so that the method is particularly suitable for a large-aperture horizontal array. According to the method, the steady information of the sound pressure amplitude received by the horizontal array is fully utilized, marine acoustic environment parameter measurement does not need to be carried out, and transceiving synchronization is not needed, so that the method is low in required equipment requirement, low in test design and cost and simple and efficient in calculation in practical application. The method can be applied to the real-time correction of large-aperture horizontal arrays in shallow sea and deep sea environments.

Description

technical field [0001] The invention belongs to the fields of underwater acoustic detection, underwater acoustic positioning, sonar technology and the like, and in particular relates to a submarine acoustic array formation estimation method utilizing the interference characteristics of the sound field. Background technique [0002] With the proposal of my country's maritime power and "going deep blue" strategy, the importance of maritime security has become increasingly prominent. As a passive receiving array, the shore-based array has the characteristics of high security, good concealment, and superior detection performance, and its array aperture is not limited by the platform, which is convenient for increasing the array aperture and increasing the range of sonar, so it is an underwater target. One of the important means of passive detection. [0003] Before the shore-based array sonar is put into use, the position of the array in the geodetic coordinate system must be d...

AI Technical Summary

Problems solved by technology

This type of algorithm is simple in principle, with a small amount of calculation and high precision, but it mainly obtains the shape of the two-dimensional array, and cannot obtain the absolute position of the array in the geodetic coordinate system; the second type is the arrival time estimation method, which uses several spatial orientations to accurately Known broadband sound sources (such as linear FM signals) or explosion sound sources, through the time system equipment, etc., provide accurate timing for the transceiver system, so as to accurately obtain the propagation time of the sound source to each hydrophone of the array, and then construct equations to solve each hydrophone of the array. location of the hydrophone

This type of algorithm has high requirements for various types of equipment, and the test design is complex and costly; the third type is the matching field method, which requires the known auxiliary source and marine acoustic environment parameters as the input of the sound field calculation model to obtain the copy field , to estimate the formation of the array by matching it with the sound pressure field measured by the hydrophone array

Therefore, the performance of this method depends on the full investigation of the ocean acoustic environment, including real-time measurement of the sound velocity profile and the investigation of the seabed bottom.

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