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Distinguishing method of ship radiation noise source based on super-directivity small-aperture cylindrical array

A radiated noise, super-directivity technology, applied in the measurement of ultrasonic/sonic/infrasonic waves, measurement devices, instruments, etc., can solve the problems of large sonar arrays, unfavorable practical application and engineering implementation, etc.

Inactive Publication Date: 2015-10-28
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0004] In conventional array signal processing, the interval between adjacent elements of the array is half of the signal wavelength. If the working frequency band of the sonar is relatively low, in order to obtain a certain spatial processing gain, the volume of the sonar array will become very large. Huge, not conducive to practical application and engineering implementation

Method used

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  • Distinguishing method of ship radiation noise source based on super-directivity small-aperture cylindrical array
  • Distinguishing method of ship radiation noise source based on super-directivity small-aperture cylindrical array
  • Distinguishing method of ship radiation noise source based on super-directivity small-aperture cylindrical array

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Embodiment

[0089] (1) Cylindrical array super-directional beamforming

[0090] The matrix parameters used in the simulation are M=10, N=6, cylinder radius a=0.5m, height d=0.5m. figure 2 The super-directional beam patterns of cylindrical arrays with different frequencies are given, where the horizontal angle θ=0°, and the elevation angle φ=90°. It can be seen that the array has better beam directivity in the low frequency band, and its main lobe width in the horizontal and elevation directions is narrower, and it has better consistency at different frequencies. image 3 , Figure 4 , Figure 5 and Figure 6 The super-directivity beam patterns of the cylindrical array with the frequency of 400Hz and different azimuths are given respectively. It can be seen that with the change of the desired direction, the change of the main lobe is small, and it has good stability.

[0091] In order to better analyze the relationship between the main lobe width of the beam and the frequency, it is ...

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Abstract

The invention provides a ship radiation noise source distinguishing method based on a super directivity small-bore cylindrical array so as to realize ship radiation noise source distinguishing through the super directivity small-bore cylindrical array. All array elements of a measurement array are used for receiving correlation properties between ambient noise signals to design a super directivity weight vector so as to form a narrow beam width and high gain processing system; on the assumption of a six-lightspot target model, a ship radiation noise source distinguishing result based on the super directivity small-bore cylindrical array is obtained through computer simulation; a comparison simulation study with conventional beam forming proves the advantages of the ship radiation noise source distinguishing method based on the super directivity small-bore cylindrical array in terms of ship radiation noise source distinguishing.

Description

technical field [0001] The invention relates to a method for measuring ship radiation noise. Background technique [0002] At present, there are many measurement methods of ship radiated noise at home and abroad, which can be roughly divided into: 1) the method using a single hydrophone, 2) the method using a cluster of hydrophones, and 3) the method using horizontal and vertical arrays , 4) using the method of cylindrical array, 5) using the method of synthetic aperture. In each method, the hydrophones or arrays are used in a different way. With the continuous development of vibration and noise reduction technology, its radiated noise level is getting lower and lower, and it is more difficult to accurately measure it and identify the source of noise. For this reason, many countries have spent huge sums of money on the research of measurement system integration technology and the construction of offshore Noise test field and movable test platform. For example, the Atlanti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00G01S5/28
Inventor 孙超向龙凤马远良杨益新杨坤德
Owner NORTHWESTERN POLYTECHNICAL UNIV
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