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Sound shielding method for multipath channel

A sound shielding and channeling technology, applied in the field of distinguishing multiple targets, can solve the problems of being unable to add one, impractical, etc.

Inactive Publication Date: 2008-12-31
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sea trial proves that the method is scientific, but it requires setting a PS (Probe Source) source at the target or using a physical time mirror, which is not practical, and it is impossible to add a PS source at a non-cooperative target whose position is unknown

Method used

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  • Sound shielding method for multipath channel
  • Sound shielding method for multipath channel
  • Sound shielding method for multipath channel

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Embodiment Construction

[0022] The present invention is described in more detail below in conjunction with accompanying drawing example:

[0023] The purpose of the present invention is not only for setting the null anti-reverberation, but also for setting the shielding area against interference from coherent noise sources. Moreover, the present invention can be applied to a horizontal array (or a single hydrophone), and can be suitable for loading on a moving platform or a fixed type on the seabed, so that the application is more convenient.

[0024] In order to realize the purpose of the present invention, the realization of sound shielding and sound focusing in the multi-channel channel that the present invention takes comprises the following steps:

[0025] (1) Measure the sound velocity of water by the sound velocity meter, predict the channel impulse response function of the target and interference by modeling, or estimate the channel by receiving the transmitted signal of the detection sound s...

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Abstract

The invention discloses an acoustic screen method of a multi-path channel. The method of the invention comprises the following steps: a sound velocity meter measures the acoustic velocity of water; a horizontal receiving array receives a radiation signal of a plurality of point sources in a sound field, amplifies the filtration and then carries out the data acquisition; the weight obtained by realizing the sound focusing of a spherical sound field array is the optimum focusing weight; based on the optimum focusing weight, shielding factors are increased to obtain the optimum focusing shielding weight; the output waveform is obtained by inverse Fourier transform and output power also can be obtained by frequency domain integral; the following coherent processing is carried out or the power after sound shielding and focusing is output. The invention is based on the principle and the method of sound shielding, applicable to multi-point source coherent interference in the water acoustics engineering; and in the engineering, the invention can adopt the horizontal array, thus being more applicable to being loaded on motion platform or being fixed at sea bottom.

Description

(1) Technical field [0001] The invention relates to distinguishing multiple targets in an underwater acoustic coherent multi-channel channel by using signal processing technology, in particular to the resolution of multiple targets in the same direction, that is, a method for detecting arbitrary sound sources at different distances in the same direction. (2) Background technology [0002] If there are multiple sound sources in the field of view of the array, they will interfere with each other and reduce the detection capability of any one of them, which is called "multi-target mutual interference". The ideal decision for signal processing is to focus on the point source (target) of interest to detect, and to block the rest of the sound sources. Under the condition of plane waves, neither focusing nor shielding can be achieved, and the optimal processing that can be achieved is the array processing technology, that is, the beam is aimed at the target, and the directivity nul...

Claims

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Application Information

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IPC IPC(8): H04B13/02H04B1/707H04L25/02H04L27/26G01S7/52
Inventor 惠娟赵安邦惠俊英余赟
Owner HARBIN ENG UNIV
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