Center-symmetric acoustic vector circular array fast spatial spectral compression super-resolution orientation estimation method

A azimuth estimation, center-symmetric technology, which is used in systems for determining direction or offset, direction finders using ultrasonic/sonic/infrasonic waves, etc. It can solve the problem of fast azimuth estimation methods that cannot be directly applied to sonar equipment and that do not have acoustic vector circular arrays. , large amount of calculation and other problems, to achieve the effect of solving low computing efficiency, high resolution, and improving resolution

Active Publication Date: 2019-11-26
HARBIN ENG UNIV
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AI Technical Summary

Problems solved by technology

The above methods have achieved good results in improving the anti-noise performance, robustness and resolution of the acoustic vector circular array azimuth estimation, but due to the huge amount of calculation in practical applications, the above methods cannot be directly applied to sonar equipment
At present, there is still no fast orientation estimation method suitable for acoustic vector circular arrays

Method used

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  • Center-symmetric acoustic vector circular array fast spatial spectral compression super-resolution orientation estimation method
  • Center-symmetric acoustic vector circular array fast spatial spectral compression super-resolution orientation estimation method
  • Center-symmetric acoustic vector circular array fast spatial spectral compression super-resolution orientation estimation method

Examples

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example 1

[0098] Example 1: Analysis of Single Sound Source Processing Effect

[0099]Example 1 The parameters are set as follows: 8-element uniform circular array, the radius of the circular array is R=0.5m, the narrow-band acoustic signal with the sound source frequency of 1kHz is incident on the circular array from the far field, the incident angle is 220°, the number of snapshots is 500, and the search The step size is 0.5°, the signal-to-noise ratio is 10dB, and the noise is Gaussian white noise. image 3 Shown are the azimuth spectrograms obtained by half-spectrum search in [0,180°] by different methods under a single sound source, where the curve with "*" represents the conventional MVDR method using the sound pressure array element, and the curve with "+" represents The method of the present invention when using the sound pressure array element is the fast MVDR method. Figure 4 Shown are the azimuth spectrograms obtained by half-spectrum search in [0,180°] by different methods...

example 2

[0100] Example 2: Analysis of Dual Sound Source Processing Effect

[0101] The parameters of Example 2 are set as follows: an 8-element uniform circular array, the radius of the circular array is R=0.5m, a narrow-band acoustic signal with a frequency of 1kHz is incident from the far field to the circular array, the incident direction is 220° and 260°, and the number of snapshots is 500. The search step size is 0.5°, the signal-to-noise ratio is 10dB, and the noise is Gaussian white noise. Figure 5 Shown are the azimuth spectrograms obtained by half-spectrum search in [0,180°] by different methods under dual sound sources, where the curve with "*" represents the conventional MVDR method using sound pressure array elements, and the curve with "+" represents the use of The method of the present invention when the sound pressure array element is used is the fast MVDR method. Figure 6 Shown are the azimuth spectrograms obtained by half-spectrum search in [0,180°] by different me...

example 3

[0102] Example 3: Analysis of orientation estimation efficiency

[0103] The parameters of Example 3 are set as follows: 8-element uniform sound vector circular array, circular array radius R=0.5m, two narrow-band incoherent acoustic signals with a frequency of 1kHz are incident on the circular array from the far field, the number of snapshots is 500, and the signal-to-noise ratio is 10dB, and the noise is Gaussian white noise. In order to ensure the reliability of the simulation results, 200 Monte Carlo experiments were carried out. Use the tic and toc functions in MATLAB to record the running time of the algorithm on the computer, and compare the time spent by the two methods for DOA estimation with different search steps in the acoustic vector circular array. The results are shown in the following table:

[0104] The time used for DOA estimation by two methods of vector circular array (unit / s)

[0105]

[0106] Examples one and two show that the application of the fast ...

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Abstract

The invention provides a center-symmetric acoustic vector circular array fast spatial spectral compression super-resolution orientation estimation method. The method comprises the steps that sensors on the upper and lower half rings of an acoustic vector circular array are arranged in a specific order respectively, and acoustic signals are collected to construct a satisfactory steering vector; then based on the average sound intensity anti-noise principle of acoustic vector sensors, a covariance matrix is constructed by using the method of combined processing of sound pressure and vibration velocity, which reduces the dimension of a vector matrix steering vector matrix and improves the anti-noise ability; a new spatial spectrum function is constructed from the spatial spectrum of a real source and a virtual source 180-degree away from the real source to carry out half-spectral search to compress the spatial spectrum of the acoustic vector circular array; and finally, through the discriminant constructed in the invention, the true sound source orientation is quickly determined. According to the invention, the spatial spectrum of the vector circular array is compressed for the firsttime, which greatly improves the operation efficiency while ensuring high resolution; and fast and efficient super-resolution orientation estimation of the acoustic vector circular array is realized.

Description

technical field [0001] The invention relates to a fast spatial spectrum compression super-resolution orientation estimation method of a center-symmetric sound vector circular array, which belongs to the field of underwater sound vector signal processing. Background technique [0002] The vector hydrophone can measure the sound pressure and particle velocity information of the sound field at the same time, and brings the ability to distinguish left and right ambiguity to the simplest line array, which can realize ambiguity-free positioning in the whole space and improve the detection and accuracy of the sound pressure array. The ability to estimate has many advantages. Circular arrays are widely used in sonar systems. Uniform circular arrays can obtain 360° all-round unambiguous azimuth information and approximately the same angular resolution, which has great advantages over uniform linear arrays. But compared with the fruitful achievements of vector linear array, there are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S3/802
CPCG01S3/802
Inventor 时洁李赫颖杨德森时胜国张宇涵李志超朱中锐柳艾飞
Owner HARBIN ENG UNIV
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