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Acoustic vector sensor amplitude weight MUSIC direction finding method

A sound vector sensor and amplitude weighting technology, which is applied in directions such as ultrasonic/sonic/infrasonic direction finders, which can solve the problem that the MUSIC direction finding technology cannot obtain high-precision estimation, and the inconsistency of noise power in the marine environment of the sound vector sensor is not considered. question

Active Publication Date: 2018-08-31
HARBIN ENG UNIV
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Problems solved by technology

[0004] When the existing MUSIC direction finding technology is applied in the direction finding of a single acoustic vector sensor, the inconsistency of the ocean environment noise power received by the sound pressure channel and the vibration velocity channel of the acoustic vector sensor is not considered, which leads to the inconsistency of the MUSIC direction finding technology under water. In the target detection, the due high-precision estimation cannot be obtained

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  • Acoustic vector sensor amplitude weight MUSIC direction finding method
  • Acoustic vector sensor amplitude weight MUSIC direction finding method

Examples

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Embodiment 1

[0103] The acoustic vector sensor is composed of a sound pressure sensor and three vibration velocity sensors perpendicular to the spatial axis. The acoustic vector sensor measures the sound pressure and the three vibration velocity components in the x, y, and z directions at the same time. The ambient noise is isotropic noise, at this time A target from (θ 1 ,φ 1 )=(20°,5°) is incident on the acoustic vector sensor, and the signal-to-noise ratio is -5dB. Assume that the initial magnitude weighting matrix is

[0104]

[0105] At this time, the spatial spectrum of the amplitude-weighted MUSIC direction-finding technique is as follows: figure 2 As shown, the spatial spectrum of the MUSIC direction finding technology is as follows image 3 shown.

[0106] to combine figure 2 , when the signal-to-noise ratio (SNR=-5dB) is low, the amplitude-weighted MUSIC direction-finding technology has a sharp spectral peak at (20.6°, 4.2°), and the position of this spectral peak ba...

Embodiment 2

[0108] The acoustic vector sensor is composed of a sound pressure sensor and three vibration velocity sensors perpendicular to the spatial axis. The acoustic vector sensor measures the sound pressure and the three vibration velocity components in the x, y, and z directions at the same time. The ambient noise is isotropic noise, at this time The two targets are respectively from (θ 1,φ1)=(80°,5°) and (θ 2 ,φ2)=(20°,5°) incident to the acoustic vector sensor, the signal-to-noise ratio is -5dB. Assume that the initial magnitude weighting matrix is

[0109]

[0110] At this time, the spatial spectrum of the amplitude-weighted MUSIC direction-finding technique is as follows: Figure 4 As shown, the spatial spectrum of the MUSIC direction finding technology is as follows Figure 5 shown.

[0111] to combine Figure 4 , when the signal-to-noise ratio (SNR=-5dB) is low, the amplitude-weighted MUSIC direction-finding technology has two sharp spectral peaks at (81.8°, 4.8°) a...

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Abstract

The invention discloses an acoustic vector sensor amplitude weight MUSIC direction finding method, belongs to the sensor signal processing technical field, and specifically relates to a method that uses a single acoustic vector sensor to carry out target direction finding in a sea environment noise field; the method is realized via an acoustic vector sensor; the acoustic vector sensor comprises asound pressure sensor and three vibration velocity sensor in a space common point mode, and can simultaneously measure the sound pressure and three vibration velocity components in x, y and z directions. The method combines to consider target angle and sound pressure channel and vibration velocity channel ambient noise powers, compensates the sound pressure and vibration velocity channel ambient noise power non-consistency, thus ensuring high estimation precision and resolution under a low signal to noise ratio condition; the method can solve the problems that an existing MUSIC direction finding technology is high in sidelobe and fat in main lobe, and cannot distinguish two targets in the sea environment noise field; the method can be applied to solve the passive direction finding problemsof a weak target and dual-target in the sea environment noise field.

Description

technical field [0001] The invention belongs to the technical field of sensor signal processing, in particular to an amplitude-weighted MUSIC direction finding method for an acoustic vector sensor. Background technique [0002] The acoustic vector sensor can obtain the sound pressure and vibration velocity information of the sound field at the same time, which provides a more favorable tool and more information for underwater target direction finding. MUSIC direction finding technology is a super-resolution direction finding technology. MUSIC technology was originally proposed in the application of radio direction finding. [0003] In recent years, MUSIC technology has been extended to the direction finding application of underwater targets with a single acoustic vector sensor. When the acoustic vector sensor is used underwater, the ocean environment noise is the main noise source. However, the sound pressure channel and the vibration velocity channel receive The noise powe...

Claims

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Application Information

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IPC IPC(8): G01S3/80
CPCG01S3/80
Inventor 柳艾飞杨德森时胜国朱中锐
Owner HARBIN ENG UNIV
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