Array processing method for phased array three-dimensional acoustics image pickup sonar

Abstract

The invention relates to an array processing method for phased array three-dimensional acoustics image pickup sonar. The array processing method for the phased array three-dimensional acoustics image pickup sonar divides an enormous beam forming operation problem of a two- dimensional area array into a plurality of small beam forming operation problems of secondary subarrays based on the subarray division principle of making a minimum operating distance of three-dimensional image pickup sonar design meet a far field condition of the secondary subarrays; and preformed beams of the secondary subarrays synthesize preformed beams of primary subarrays to obtain all the preformed beams of the prior two-dimensional area array. The method has the advantages that the processing method for simplifying greatly improves efficiency of beam forming. In addition, the array processing method for the phased array three-dimensional acoustics image pickup sonar fully considers a situation that a target stays in a near field, and adopts a method of combining time delay and phase adjustment in the process of beam forming of the primary subarrays so as to make the array processing method have automatic adaptive functions to the targets in the far field and the near field.

Description

Technical field [0001] The invention relates to the field of underwater acoustics, and mainly relates to an array processing method of a phased array three-dimensional acoustic imaging sonar. Background technique [0002] In order to meet the requirements of marine development for three-dimensional detection of underwater targets, marine instruments generally use a two-dimensional array as the receiving array of the transducer (such as figure 1 As shown, note: a circle represents a sub-array). The two-dimensional area array used to receive echo signals usually has more than 2,000 array elements, and the number of pre-formed beams reaches more than 10,000. The conventional beamforming algorithm has the following disadvantages: [0003] ① The time-domain beamforming algorithm needs to calculate the time delay of each pre-formed beam for each array element and store these time delays, resulting in a sharp increase in storage capacity; [0004] ② During the beamforming process...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the disadvantages of low calculation efficiency and inability to automatically adapt to far and near-field targets in conventional beamforming algorithms of two-dimensional arrays, and to provide a phased array three-dimensional acoustic imaging sonar array processing method for The receiving beamforming algorithm of various marine instruments such as phased array three-dimensional acoustic camera sonar (hereinafter referred to as three-dimensional camera sonar) that uses a two-dimensional area array as the receiving array has high computing efficiency and can automatically adapt to far and near-field targets. Matching advantages

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