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An Amplitude Weighted Music Direction Finding Method for Acoustic Vector Sensor

A sound vector sensor and amplitude weighting technology, applied in directions such as ultrasonic/sonic/infrasonic direction finders, can solve the problem of inconsistency of noise power in the marine environment without considering the sound vector sensor, MUSIC direction finding technology cannot obtain high-precision estimation, etc. problem, to achieve the effect of high estimation accuracy and resolution

Active Publication Date: 2021-11-23
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • An Amplitude Weighted Music Direction Finding Method for Acoustic Vector Sensor
  • An Amplitude Weighted Music Direction Finding Method for Acoustic Vector Sensor
  • An Amplitude Weighted Music Direction Finding Method for Acoustic Vector Sensor

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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.

[0104] Assume that the initial magnitude weighting matrix is

[0105]

[0106] 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.

[0107] 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 p...

Embodiment 2

[0109] 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 ,φ 1 )=(80°,5°) and (θ 2 ,φ 2 )=(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

[0110]

[0111] 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.

[0112] 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°...

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Abstract

The invention discloses an amplitude-weighted MUSIC direction finding method for an acoustic vector sensor, which belongs to the technical field of sensor signal processing, and specifically uses a single acoustic vector sensor to measure the direction of a target in a marine environment noise field. The method is realized by an acoustic vector sensor. The acoustic vector sensor is composed of a sound pressure sensor and three vibration velocity sensors at the same point in space, and simultaneously measures the sound pressure and three vibration velocity components in x, y, and z directions. The invention jointly estimates the target angle and the environmental noise power of the sound pressure channel and the vibration velocity channel, compensates the inconsistency of the sound pressure and the environmental noise power of the vibration velocity channel, and ensures that the direction finding method is still effective under the condition of low signal-to-noise ratio. It has high estimation accuracy and resolution. At the same time, it solves the problems of high side lobe, fat main lobe, and inability to distinguish two targets when the existing MUSIC direction finding technology is applied in the marine environmental noise field, and can be effectively used to solve the problem of weak targets and double targets in the marine environmental noise field. Passive direction finding problem.

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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Patent Type & Authority Patents(China)
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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