Underwater target radiated noise measurement method based on Fourier integration method

A Fourier integral and underwater target technology, applied in the field of noise measurement, can solve the problems of large measurement errors of underwater target radiation noise source level, etc., and achieve the effect of improving signal-to-noise ratio and accurate measurement results

Active Publication Date: 2018-11-20
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0005] The technical problem solved by the present invention is: in order to overcome the problem that the measurement error of the underwater target radiation noise source level is relatively large due to the low signal-to

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  • Underwater target radiated noise measurement method based on Fourier integration method
  • Underwater target radiated noise measurement method based on Fourier integration method
  • Underwater target radiated noise measurement method based on Fourier integration method

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Embodiment Construction

[0052] see Figure 1-Figure 6 , main content of the present invention has:

[0053] 1) In the shallow sea waveguide environment, the vertical linear array is used to receive the target radiation noise signal. The vertical array is arranged at equal intervals, and the length of the array is greater than or equal to 1 meter, and less than or equal to half of the water depth of the measurement field. According to the shallow sea waveguide environment, sound velocity profile, depth and distance of the underwater target in the measurement field, the vertical angle of arrival of the underwater target is estimated and tracked. The method is to use the geometric ray to directly estimate the vertical angle of arrival of the direct wave of the radiated noise signal;

[0054] 2) Perform cross-correlation processing on the received signals on the N elements of the vertical linear array, which can be equivalent to N 2 The outputs on the virtual array elements are then de-redundantly pro...

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Abstract

The invention relates to an underwater target radiated noise measurement method based on a Fourier integration method. More outputs of different phases are obtained through cross-spectrum combinationof array elements, and the outputs of the phases are equivalent to virtual array elements with different coordinates and thus a large aperture virtual array is formed, so that the aperture of the vertical array is expanded to be larger than the original physical aperture and a higher degree of freedom is obtained to suppress noise. On this basis, spatial smoothing and adaptive beamforming are performed on the virtual array subjected to aperture expansion, and an obtained underwater target radiated noise measurement result is superior to that of a traditional mono-acoustic hydrophone measurement method. Compared with the traditional mono-acoustic pressure hydrophone measurement method, the method of the invention utilizes the noise suppression capability of cross-correlation processing of the Fourier integration method and obtains the aperture expansion effect of the virtual array; the signal-to-noise ratio is improved and measurement results more accurate than those obtained by the existing method can be obtained.

Description

technical field [0001] The invention belongs to the field of noise measurement, in particular to a method for measuring radiation noise of an underwater target based on a Fourier integral method. Background technique [0002] The radiation noise of underwater targets is one of the important indicators affecting the concealment of underwater targets, and its accurate measurement is the premise of reducing vibration and noise to reduce the probability of being discovered. Therefore, it is necessary to study a high-precision underwater target radiation noise measurement method. [0003] At present, the measurement method of underwater target radiated noise is mainly the single sound pressure hydrophone measurement method. The principle of this method is simple. When deploying, it is only necessary to deploy the measuring hydrophone at the same depth as the geometric center of the underwater target. , passing through the measuring hydrophone at a constant speed. During this p...

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Application Information

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IPC IPC(8): G01S7/52
CPCG01S7/52001
Inventor 刘雄厚李晓彬孙超蒋国庆张少东
Owner NORTHWESTERN POLYTECHNICAL UNIV
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