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Method for rapidly estimating scattering sound field of underwater circular corner reflector

A corner reflector, scattered sound technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of slow calculation speed and large amount of calculation.

Active Publication Date: 2014-06-11
HARBIN ENG UNIV
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Problems solved by technology

At present, most of the methods for estimating the scattering sound field of corner reflectors are numerical calculation methods that require computer-aided software for grid division. The calculation amount is large and the calculation speed is slow. The existing fast calculation methods can only calculate the edge of the reflective surface as a straight line. Triangular corner reflectors or square corner reflectors of , round corner reflectors with curved edges cannot be calculated

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  • Method for rapidly estimating scattering sound field of underwater circular corner reflector
  • Method for rapidly estimating scattering sound field of underwater circular corner reflector
  • Method for rapidly estimating scattering sound field of underwater circular corner reflector

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Embodiment Construction

[0050] Attached below Figure 1-9 A method for quickly estimating the scattering sound field of an underwater circular-corner reflector in the present invention will be further described in detail with an example.

[0051] The first step is to set the parameters of the round corner reflector and the sound source parameters. The parameter of the circular corner reflector is the length of the right-angled side of the corner reflector, and the sound source parameters are the position of the sound source and the frequency of the sound wave.

[0052] The second step is to discretize the arc edges that make up the circular corner reflector, and the discretization is to take A on the arc 1 、A 2 、A 3 ...A N-1 、A N A discrete point, where the distance between two adjacent points is one-eighth of the wavelength of the sound wave, and a straight line is used to connect the two adjacent points, so that the entire arc is replaced by a connected line segment, such as figure 1 shown. ...

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Abstract

The invention discloses a method for rapidly estimating a scattering sound field of an underwater circular corner reflector. The method comprises the following steps of measuring parameters of the circular corner reflector and parameters of a sound source; discretizing a circular arc of the circular corner reflector to obtain N primarily-divided surface elements; calculating a scattering sound field of one primarily-divided surface element after multiple scattering; calculating first scattering sound fields of the primarily-divided surface elements at an acceptance point, judging whether primarily-reflected sound beams are interested with the other surfaces of the circular corner reflector or not to obtain secondarily-divided surface elements, calculating second scattering sound fields of the secondarily-divided surface elements at the acceptance point, calculating whether secondarily-reflected sound beams are intersected with the other surfaces of the circular corner reflector or not to obtain tertiarily-divided surface elements, calculating third scattering sound fields of the tertiarily-divided surface elements at the acceptance point, and superimposing and summing the first, second and third scattering sound fields; superimposing the scattering sound fields of the N primarily-divided surface elements after multiple scattering. According to the method, a theoretical calculation method for the use of the corner reflector is provided, the calculation time is reduced, and the working efficiency is improved.

Description

technical field [0001] The invention belongs to the field of underwater target sound scattering, and mainly relates to a method for estimating the scattering sound field of an underwater circular corner reflector. Background technique [0002] Corner reflectors are divided into two-sided and three-sided corner reflectors. The corner reflector composed of three mutually perpendicular planes is called a three-sided corner reflector. When the three mutually perpendicular planes are the same quarter circle It is called a circular trihedral corner reflector or a circular corner reflector. The trihedral reflector has the characteristic of having a larger target intensity in a larger spatial azimuth range, so it can be used as an acoustic reflector or an underwater acoustic marker, and can also be used as a standard reflector to calibrate the underwater target intensity, or as a Acoustic decoys and experimental targets that simulate the echo of underwater targets. At present, mos...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 陈文剑孙辉孙铁林孙筱逸
Owner HARBIN ENG UNIV
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