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Method for positioning underwater low-frequency sound source based on acoustic sensor arrays in air

A sensor array, sensor technology, used in positioning, instruments, measuring devices, etc., can solve problems such as no longer applicable

Inactive Publication Date: 2009-12-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In conditions where underwater targets are not visible, the system is no longer applicable
So far, there has been no report on the application of this abnormal phenomenon to realize the location of underwater sound sources based on the acoustic information measured in the air.

Method used

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  • Method for positioning underwater low-frequency sound source based on acoustic sensor arrays in air
  • Method for positioning underwater low-frequency sound source based on acoustic sensor arrays in air
  • Method for positioning underwater low-frequency sound source based on acoustic sensor arrays in air

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Embodiment Construction

[0023] Taking the positioning of a 100Hz point sound source at a depth of 0.24m underwater and having rectangular coordinates of (0, 0, -0.24) (the units of the rectangular coordinates are all m) as an example, the present invention will be described in detail below. The medium in z≥0 area is set as air, and the medium in z<0 area is water.

[0024] 1. At height z h A sensor is placed arbitrarily within a horizontal plane of 1m, assuming that the measured sound pressure is a single-frequency signal of 100Hz. Arrange two circular acoustic sensor arrays with any two points A and B in the plane as the center of the circle. The radius of the array is taken as 1 / 2 of the wavelength of the 100Hz sound wave in the air, that is, 1.7m. Each array contains 12 acoustic sensors, which are distributed at equal angular intervals. See the specific configuration diagram image 3 .

[0025] 2. For the sensor array A, take the quantity in formula (1) as the observed value, and the change cur...

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Abstract

The invention discloses a method for positioning an underwater low-frequency sound source by laying acoustic sensor arrays in the air, which comprises the steps: (1) laying two round acoustic sensor arrays on any horizontal plane in the air, measuring an acoustic pressure signal, estimating directions of arrival of the sound source from the projection position on the horizontal plane to the sensor arrays, and determining the position of the projection of the sound source on the horizontal plane according to the two directions of arrival; (2) freely selecting two sensors in certain array, drawing a change curve of the sound pressure difference at the two positions along with the depth of the sound source based on a law of low-frequency acoustic transmission of underwater point sources, and determining possible depths of the underwater sound source through one-dimensional search according to the actually measured sound pressure difference; and (3) determining the depth of the underwater sound source by calculating and comparing average deviations of measured values and theoretical values of sound pressure differences among all sensors in the array under various possible depths. The method can cheaply, simply and conveniently position underwater target sound sources, and has great practical value.

Description

1. Technical field [0001] The invention relates to a method for locating an underwater low-frequency sound source, in particular to a method for locating an underwater low-frequency sound source by laying an array of acoustic sensors in the air. 2. Background technology [0002] The main applications of underwater sound source location are: reconnaissance and anti-reconnaissance of submarines, torpedoes and unmanned underwater vehicles; environmental monitoring of various underwater crustal movements such as submarine earthquakes and volcanic eruptions; detection of underwater fish activity areas . The characteristic impedance of water and air is very different. The traditional acoustic theory believes that when the acoustic signal in water reaches the water-air interface, it is totally reflected and cannot be transmitted into the air. Therefore, the prior art realizes underwater sound source localization based on the underwater acoustic signal response and the spatial char...

Claims

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Application Information

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IPC IPC(8): G01S5/18G01S5/20G01S11/14
Inventor 陶建成邱小军
Owner NANJING UNIV
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