Single-hydrophone sound source passive positioning method in deep sea environment

A deep-sea environment, passive positioning technology, applied in the field of sonar, underwater acoustic detection, can solve the problem of a large number of hydrophones, active sound and so on

Active Publication Date: 2018-05-29
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] In order to avoid the deficiencies of the prior art, the present invention proposes a single hydrophone sound source passive positioning method in the deep sea environment, which solves the problems that the existing sound source positioning method in the deep sea environment requires a large number of hydrophones and requires active sounding.

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  • Single-hydrophone sound source passive positioning method in deep sea environment
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  • Single-hydrophone sound source passive positioning method in deep sea environment

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Embodiment Construction

[0041] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0042] Step 1: Deploy a single hydrophone in the sea in the form of a submersible buoy or a buoy, and obtain the depth information of the hydrophone through a depth sensor.

[0043] The depth z refers to the distance between the hydrophone and the sea level. The depth of the ocean is H. In the deep sea environment, the depth of the sound source is d, and the horizontal distance between the sound source and the hydrophone is r. When dB , T SB , T BS , T SBS .

[0044] Step 2: For the received broadband signal, by performing autocorrelation processing on the signal, six relative time delays between the arrival signals of the four paths can be obtained without prior information of the signal.

[0045] The received signal is set as s(t), and the autocorrelation of the signal can be expressed as

[0046]

[0047] where T is the signal length, ( ) * denotes the...

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Abstract

The invention relates to a single-hydrophone sound source passive positioning method in a deep sea environment. A wide-band signal received by a single hydrophone is used. A large-aperture array composed of a number of hydrophones is not needed. Signal synchronization between hydrophones is not needed. Sound source positioning in the deep sea environment can be realized without exposing the position in a passive receiving mode. According to the invention, six indiscernible relative time delays are arranged in ascending order to form a relative time delay vector for sound source positioning; anerror vector is acquired by subtracting the measured time delay vector from a predicted time delay vector, and the 1-norm and the reciprocal of the error vector is acquired for sound source positioning; the method is used in the South China Sea at a sea depth of 2680 meters in summer; a sound source is a linear chirp signal with a bandwidth of 2.9kHz to 3.1kHz; the sound source distance is 13.8 kilometers, and the depth is 49 meters; the positioning of the sound source is completed; the relative distance error is 2.9%; and the relative depth error is 22.5%.

Description

technical field [0001] The invention belongs to the fields of underwater acoustic detection, sonar technology and the like, and relates to a sound source localization method in water, in particular to a single hydrophone sound source passive localization method in a deep sea environment. Background technique [0002] The underwater sound source localization method usually reconstructs the sound source position information by extracting the information contained in the signal received by a single hydrophone (sensor) or multiple hydrophone arrays arranged in a certain way. The more common method is the matching field processing method, but this method requires a large aperture and the number of array elements to collect enough information to locate the sound source, and this type of method has a large amount of calculation and is greatly affected by environmental mismatch. , not suitable for sound source localization in deep sea environment. In the deep sea environment, there...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S5/22
CPCG01S5/22
Inventor 杨益新刘文旭
Owner NORTHWESTERN POLYTECHNICAL UNIV
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