Near-field underwater fixed multi-element linear array three-dimensional correction method

Abstract

The invention discloses a near-field underwater fixed multi-element linear array three-dimensional correction method, which comprises the following steps of: arranging a single signal correction signal source system at a plurality of positions and a plurality of depths around a seabed fixed multi-element underwater linear array in a time-sharing placement mode, transmitting single-frequency high-power correction signals, and recording azimuth information and time information of the signal source; recording depth information of each position of the array by using a depth sensor; carrying out synchronous time service on signal data sent by a fixed multi-element linear array receiving signal source by utilizing a navigation satellite signal, and carrying out time marking and conditioning on the data; after signals are received, constructing a near-field signal model containing amplitude-phase errors and three-dimensional position errors, then constructing a target function by taking a spatial spectrum estimation method as a theoretical basis, setting related parameters of a particle swarm intelligent algorithm, optimizing a target, and obtaining estimated values of the amplitude-phase errors and the three-dimensional position errors of an array; and substituting the error estimation value into an original array manifold, completing near-field array error correction, and obtaining absolute latitude and longitude coordinates of each array element of the whole array at the same time.

Description

technical field [0001] The invention relates to the field of underwater array formation correction, in particular to a three-dimensional correction method for a near-field underwater fixed multi-element linear array. Background technique [0002] In the underwater noise measurement of ships, using a large-aperture multi-element line array as a platform, supplemented by a high-resolution sound source localization algorithm is an effective means to achieve accurate localization and identification of noise sources. However, for a fixed multi-element linear array noise test system deployed underwater, deformation will inevitably occur during the deployment process. If it is simplified to an ideal array for processing, the performance of the sound source localization algorithm may drop sharply , so array error correction is required. For the underwater multi-element linear array, the error of the array mainly comes from the three-dimensional position error of the array and the a...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the three-dimensional position error caused by the deformation of the submarine fixed underwater large-aperture multi-element linear array and the amplitude and phase error between the array element hydrophones in the underwater ship noise test. The present invention proposes a near-field A joint correction method for amplitude-phase error and three-dimensional position error

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