A Method for Measuring Radiation Noise of Underwater Target Based on Fourier Integral Method

A Fourier integration and radiation noise technology, applied in radio wave measurement systems, instruments, etc., can solve the problem of large measurement errors of underwater target radiation noise source level, and achieve the effect of improving the signal-to-noise ratio and accurate measurement results.

Active Publication Date: 2022-03-25
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-noise ratio of the traditional single sound pressure hydrophone measurement method, the present invention proposes a method based on Fourier Integral method (FIM: Fourier integral method) radiation noise measurement method

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  • A Method for Measuring Radiation Noise of Underwater Target Based on Fourier Integral Method
  • A Method for Measuring Radiation Noise of Underwater Target Based on Fourier Integral Method
  • A Method for Measuring Radiation Noise of Underwater Target Based on Fourier Integral Method

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Embodiment Construction

[0052] see Figure 1-Figure 6 , the main contents of the present invention are:

[0053] 1) In the shallow sea waveguide environment, the vertical linear array is used to receive the target radiated 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 directly predict the vertical arrival angle of the direct wave of the radiated noise signal by using geometric rays;

[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 de-redundant, and the out...

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Abstract

The invention relates to a method for measuring radiation noise of an underwater target based on the Fourier integral method. The cross-spectrum between array elements is used to combine more outputs of different phases, and the outputs of these different phases are equivalent to having different coordinates. The virtual array elements are combined to form a large-aperture virtual array, 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 after aperture expansion, and the underwater target radiation noise measurement results are better than the traditional single sound pressure hydrophone measurement method. Compared with the traditional single-sound pressure hydrophone measurement method, the present invention uses the noise suppression ability of the cross-correlation processing of the Fourier integral method, and obtains the aperture expansion effect of the virtual array, improves the signal-to-noise ratio, and can Obtain more accurate measurement results than existing methods.

Description

technical field [0001] The invention belongs to the field of noise measurement, in particular to an underwater target radiation noise measurement method 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 vibration reduction and noise reduction to reduce the probability of detection. Therefore, it is necessary to study high-precision underwater target radiation noise measurement methods. [0003] At present, the measurement method for the radiated noise of underwater targets is mainly the single sound pressure hydrophone measurement method. The principle of this method is simple. When deploying, the measuring hydrophone only needs to be placed at the same depth as the geometric center of the underwater target. , at a constant speed through the measuring hydrophone. During this process, th...

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Application Information

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Patent Type & Authority Patents(China)
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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