Near field acoustic source localization using beam space focused minimum variance beamforming

Taek-Ik  Kwon; Ki-Man  Kim; Seongil  Kim; Jae-kyun   Ahn

doi:10.7776/ASK.2017.36.2.100

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Near field acoustic source localization using beam space focused minimum variance beamforming 빔 공간 초점 최소 분산 빔 형성을 이용한근접장 음원 위치 추정

31 March 2017. pp. 100-107

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Abstract

The focused MVDR (Minimum Variance Distortionless Response) can be applied for source localization in near field. However, if the number of sensors are increased, it requires a large amount of calculation to obtain the inverse of the covariance matrix. In this paper we propose a focused MVDR method using that beam space is formed from output of far field beamformer at the subarray. The performances of the proposed method was evaluated by simulation. As a result of simulation, the proposed method has the higher spatial resolution performance then the conventional delay-and-sum beamformer.

Keywords

Source localization

Sensor array

Near-field beamforming

Focused MVDR (Minimum Variance Distortionless Response) beamformer

Focused beam-space MVDR beamformer

초점 MVDR(Minimum Variance Distortionless Response) 빔 형성은 근접장에서 표적의 위치를 추정하는데 적용될 수 있다. 하지만 배열을 구성하는 센서의 수가 많아질수록 공분산 행렬의 역행렬을 구하는데 많은 계산량을 필요로 한다. 본 논문에서는 부 배열의 원거리 빔 형성기 출력들로부터 빔 공간을 형성하고 이를 이용하여 초점 MVDR 빔 형성을 수행하는 방식을 제안하였다. 제안된 방법의 성능을 분석하기 위하여 모의실험을 수행하였다. 모의실험 결과, 제안된 방법의 공간 분해능이 기존의 지연 합 빔 형성기를 이용한 경우 보다 높게 나타났다.

키워드

위치 추정

센서 어레이

근접장 빔 형성

초점 MVDR(Minimum Variance Distortionless Response)

빔 공간 MVDR

References

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Information

Publisher :The Acoustical Society of Korea
Publisher(Ko) :한국음향학회
Journal Title :The Journal of the Acoustical Society of Korea
Journal Title(Ko) :한국음향학회지
Volume : 36
No :2
Pages :100-107
Received Date : 2016-12-27
Revised Date : 2017-02-01
Accepted Date : 2017-03-29
DOI :https://doi.org/10.7776/ASK.2017.36.2.100

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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