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A Direction Finding Method of Acoustic Vector Sensor

A sound vector sensor, sound pressure sensor technology, applied in directions such as direction finders using ultrasonic/sonic/infrasonic waves, systems for determining direction or offset, etc., can solve problems such as reduced estimation accuracy, and achieve high estimation accuracy and robustness Effect

Active Publication Date: 2022-05-20
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MUSIC direction finding technology is susceptible to the influence of channel phase error, and the estimation accuracy is reduced

Method used

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  • A Direction Finding Method of Acoustic Vector Sensor
  • A Direction Finding Method of Acoustic Vector Sensor
  • A Direction Finding Method of Acoustic Vector Sensor

Examples

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example 1

[0097] The acoustic vector sensor is composed of a sound pressure sensor and a three-dimensional vibration velocity sensor orthogonal to each other in the horizontal plane at the same point in space. The acoustic vector sensor measures the sound pressure and the three vibration velocity components in the x, y, and z axes at the same time. The ambient noise is isotropic noise, a 3kHz single-frequency target signal from (θ 1 ,φ 1 ) = (50°, 40°) incident to the vector sensor, SNR = 5dB, and the number of samples is 5000. The estimated results of the horizontal azimuth and elevation angles are given below.

[0098] When there is no phase error, the two-dimensional spatial spectra of the direction finding method of the present invention and the MUSIC direction finding method are respectively as follows figure 2 and image 3 shown. Depend on figure 2 It can be seen that there is ambiguity in angle estimation in the direction finding method of the present invention, and the a...

example 2

[0102] The acoustic vector sensor is composed of a sound pressure sensor and a two-dimensional vibration velocity sensor orthogonal to each other in the horizontal plane. The acoustic vector sensor measures the sound pressure and the two vibration velocity components in the x and y axes at the same time. The ambient noise is isotropic noise, a 3kHz single-frequency target signal from (θ 1 ,φ 1 )=(50°, 0°) is incident to the vector sensor, SNR=0dB, and the number of samples is 5000. Pitch angle φ 1 =10° is known, and the estimation result of horizontal azimuth is given below.

[0103] When there is no phase error, the horizontal azimuth spatial spectrum of the MUSIC direction-finding method and the direction-finding method of the present invention is as follows Figure 6 shown. Depend on Figure 6 It can be seen that there is ambiguity in angle estimation in the direction finding method of the present invention, and the azimuth corresponding to the first spectral peak on ...

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Abstract

The invention discloses a direction finding method of an acoustic vector sensor, which specifically uses a single acoustic vector sensor to perform robust and high-precision direction finding for 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 specific process of the present invention is firstly using the Hadamard product of the first principal eigenvector of the received signal covariance matrix to construct a spatial spectrum, thereby eliminating the influence of the channel phase error on the direction finding result, and then using the defuzzification operation to obtain the direction finding result without ambiguity. The effect of the present invention is not affected by the phase error of the channel, and has strong robustness, which ensures that the direction finding method still has a high estimation accuracy under the condition of the phase error of the channel, and is helpful to realize high-precision measurement of the single vector sensor to the practical application of technology.

Description

technical field [0001] The invention relates to a direction finding method of an acoustic vector sensor, belonging to the technical field of sensor signal processing. Background technique [0002] Due to the directivity of the vibration velocity channel of the acoustic vector sensor, a single acoustic vector sensor can realize target direction finding. The most commonly used orientation estimation method for single-vector sensors is the acoustic energy flow method. Under the condition of high signal-to-noise ratio, the acoustic energy flow method has high estimation accuracy; but at low signal-to-noise ratio, its estimation accuracy drops sharply. If the received data of the sound pressure channel and the vibration velocity channel of the single vector sensor constitute a vector, the target orientation estimation can be realized by means of array signal processing. The single vector sensor multiple signal classification (MUSIC) direction finding method is to use the array ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S3/802
CPCG01S3/802
Inventor 柳艾飞杨德森时胜国李思纯李赢
Owner HARBIN ENG UNIV