Bounded space correction method for low-frequency super-directional multi-polar vector array

A technology of super directivity and correction method, applied in radio wave measurement systems, instruments and other directions, it can solve problems such as complex problems, increased difficulty in low-frequency correction, and the non-negligibility of correction space, achieving the effect of wide application and strong operability

Active Publication Date: 2017-08-11
HARBIN ENG UNIV
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Problems solved by technology

Due to the actual working site, the frequency that can be corrected in the pool environment is very strictly limited, and the difficulty of low-frequency calibration is greatly increased; due to the existence of factors such as the high amplitude and phase error sensitivity of the super-directional ar

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  • Bounded space correction method for low-frequency super-directional multi-polar vector array
  • Bounded space correction method for low-frequency super-directional multi-polar vector array
  • Bounded space correction method for low-frequency super-directional multi-polar vector array

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Embodiment Construction

[0044] Below in conjunction with accompanying drawing, invention is described in more detail:

[0045] (1) The super-directional multipole sub-vector array includes array elements 0 to 4, which form a cross shape. The origin of the cross is array element 0, and the distance d between array elements 1 to 4 is equal to that of array element 0. , and kd<<1 is satisfied between the array element spacing d and the wave number k. Install the basic array on the crane of the measuring pool through the adapter flange, and put it into the pool at about 1 / 2 of the depth. Among them, the No. 0 primitive is located in the center of the array, and it is hung directly under the mechanical rotating device. At the same time, the auxiliary sound source for measurement is hoisted to the same depth. The distance between the sound source and the geometric center of the basic array is r to meet the acoustic far-field condition.

[0046] (2) Adjust the signal transmitter to generate the CW pulse si...

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Abstract

The present invention belongs to the field of underwater acoustic vector array calibration, and more particularly relates to a bounded space correction method for the low-frequency directional multi-polar vector array for the calibration of the super-directional multi-polar vector array within the low-frequency ranging from 20 to 1000 hz. The method comprises the following steps: establishing a super-directional multi-polar vector array including 0 to 4 matrixes; producing by a modulating signal generator a CW pulse signal to be loaded by a power amplifier into a sound source to form a testing sound field; rotating super-directional multi-polar vector array for 0 to 360 degrees; and collecting and storing the receiving signals of the 0 to 4 elements with each array element consisting of a sound pressure signal and two channels of vibration velocity communication signals, etc. The method of the invention overcomes the problem that currently, the calibration of a small-scale array needs a large-scale free field space and provides a calibration method for bounded water areas. The method has strong operability, is convenient and practical to use and can be widely used in the calibration of low-frequency super-directional vector array, making it widely used in various fields of low-frequency water sound metering.

Description

technical field [0001] The invention belongs to the field of underwater acoustic vector array correction, in particular to a bounded space correction method for low-frequency super-directivity multipole sub-vector array correction in the low frequency range of 20-1000 Hz. Background technique [0002] In the low-frequency and very low-frequency working section, the Rayleigh limit of traditional sonar design seriously restricts the application of underwater acoustic array and its azimuth estimation performance. The breakthrough in the research work of super-directional matrix provides a solution to this problem. In recent years, the super-directional array beamforming method based on small aperture has become a research hotspot. A large number of design analysis and computer simulations have shown the advantages of this type of array, but only a limited number of finished systems have been used in actual work. One of the main reasons is the strong sensitivity of this type of...

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Application Information

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IPC IPC(8): G01S7/52
Inventor 郭俊媛杨士莪陈洪娟朴胜春李智张虎
Owner HARBIN ENG UNIV
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