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Impedance characteristic calibration method of low-frequency sonar array

A technology of impedance characteristics and calibration methods, applied in radio wave measurement systems, instruments, etc., can solve problems such as unfavorable ship monitoring, inaccurate monitoring results, and affecting ship operation, and achieve the effect of ensuring stability

Active Publication Date: 2019-02-22
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When human beings explore the ocean, they cannot do without the ship, and to grasp the operation of the ship in the ocean is mainly to monitor the active sonar of the ship based on the underwater sound. If the underwater sonar at the ship is of low frequency, it is not conducive to monitoring the ship, resulting The monitoring results are inaccurate, which affects the judgment of the ship's operation

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  • Impedance characteristic calibration method of low-frequency sonar array
  • Impedance characteristic calibration method of low-frequency sonar array
  • Impedance characteristic calibration method of low-frequency sonar array

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Embodiment 1

[0089] The method for calibrating the impedance characteristics of the low-frequency sonar array in this embodiment includes the following steps:

[0090] a. Development of software for calibration of impedance characteristics of low-frequency sonar arrays:

[0091] a1. First, design the software architecture for the calibration of the impedance characteristics of the low-frequency sonar array

[0092] Based on the calibration principle model of the near-field acoustic holography method based on the impedance characteristics of the planar sonar array, the software architecture and human-computer interaction interface design are carried out. The software needs to complete the following functions:

[0093] Various parameter settings during calibration;

[0094] Control the normal operation of instrumentation equipment;

[0095] Complete various arithmetic operations;

[0096] Printout of calibration results and storage of calibration results, etc. The finally developed low-fr...

Embodiment 2

[0253] Designing an actual acoustic holographic calibration measurement test in step b3 in the first embodiment includes the following steps:

[0254] b31. Test site: open water (free field);

[0255] b32. Test sample: planar emission array (nine-element array);

[0256] b33. Inspection frequency: 100Hz~630Hz;

[0257] b34. Sample size: length 3m, width 1m;

[0258] b35. Sound field layout: reasonably place the hydrophone array to ensure the stability of the sound field test results as much as possible;

[0259] b36. Sound field measurement parameters:

[0260] b37. Measurement signal: long enough (5-10 cycles), collected multiple times (5-20) and averaged multiple times.

Embodiment 3

[0262] The sound field measurement parameters of step b36 in the second embodiment include the following steps:

[0263] b36.1, measuring surface size

[0264] In order to ensure the accuracy of the holographic transformation field and ensure that the measurement data obtains the necessary multi-sound source radiation energy and sound source information, the holographic surface must be large enough. If the ratio of the scale of the sound source surface to the wavelength and the measurement distance are known, the size of the measurement surface can be determined. If the sound pressure amplitude at the edge of the measuring aperture has a 30dB attenuation as the criterion, for the case of L / λ=1, when the measuring distance is 1 / 4λ, the side length of the measuring surface L x It should be 3 times the side length L of the sound source surface; when the measurement distance is 1 / 2 wavelength, the side length L of the measurement surface x It should be 3.5 times the side length ...

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Abstract

The invention relates to an impedance characteristic calibration method of a low-frequency sonar array, and belongs to the technical field of research on impedance characteristic near-field acoustic holographic measurement methods of the large planar emission array. The method is technically characterized in that an impedance characteristic calibration software configuration of the low frequency sonar array is designed; a consistency calibration function module of a measurement system is developed; and calibration measurement and test via the impedance characteristic near field acoustic holographic method of the planar sonar array is carried out. Research related to basic principles of the impedance characteristic near field acoustic holographic method of the planar sonar array, near-fieldholographic method calibration scheme design, low-frequency sonar array impedance characteristic measurement calibration software development and measurement and test of the near-field acoustic holographic calibration can be carried out in a targeted way according to requirements for acoustic characteristic calibration of an active sonar device of a water sound monitoring ship, the calibration capability of the lower-frequency emitting energy transducer calibration system is improved, the problems in evaluating the impedance characteristics of the low frequency sonar array are solved, the ship whose water sonar is in low frequency can be used for monitoring, and the low-frequency sonar monitoring result of the ship is more accurate.

Description

Technical field: [0001] The invention relates to the research on the near-field acoustic holographic measurement method of the impedance characteristics of large-scale planar emission arrays, in particular to a method for calibrating the impedance characteristics of low-frequency sonar arrays Background technique: [0002] The ocean occupies more than 70% of the earth's total area, and it contains a lot of energy and resources. With the continuous advancement of the world's scientific and technological level, the pace of human exploration of the ocean is accelerating, and the status of the ocean is increasing. People are increasingly aware that the ocean will become the basic environment for human survival. When human beings explore the ocean, they cannot do without ships, and mastering the operation of ships in the ocean is mainly to monitor the active sonar of the ship based on the underwater sound. If the underwater sonar at the ship is of low frequency, it is not conduci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/52
CPCG01S7/52004
Inventor 商德江平自红肖妍韩金风刘月婵孙超
Owner HARBIN ENG UNIV
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