Left right discrimination performance improvement for the line array sonar system

Ho-Jun Lee; Jong-Min Ahn; Jong-Pill Seo; Jae-Kyun Ahn; Seong-Il Kim; Jae-Hak Chung

doi:10.7776/ASK.2017.36.1.039

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2017 Vol.36, Issue 1 Preview Page Next Page

Left right discrimination performance improvement for the line array sonar system 선 배열 소나 시스템을 위한 좌 우 구분 성능 개선 기법

31 January 2017. pp. 49-56

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Abstract

This paper proposes a method to improve the left right discrimination performance by eliminating the imaginary target based on the frequency features of the beam pattern for bow array. The beamwidth of the imaginary target is wider than that of the real target. If an azimuth axis is considered as a time axis, the real and the imaginary targets can be assumed as high and low frequencies, respectively. To eliminate the imaginary target which has a low frequency component, we design a cut-off frequency of the High Pass Filter (HPF) using the back-lobe imaginary beamwidth. The real target is estimated by eliminating the imaginary target by applying HPF to the entire power of the beamformer output. Computer simulations show that the proposed method can increase the left right discrimination performance above 8 dB on average.

Keywords

Left right discrimination

Nonlinear array

Bow array

Beam pattern frequency division method

본 논문에서는 활 형상 배열의 빔패턴 주파수 특성을 이용하여 허위표적을 제거함으로써 좌 우 구분 성능을 개선하는 방법을 제안한다. 방위각을 시간 축으로 변환하여 실 표적과 허위표적을 각각 고주파수와 저주파수 성분으로 간주한다. 허위표적의 후엽 빔 폭을 이용하여 허위표적 제거용 고역 통과 필터를 설계한다. 전체 빔형성기 출력 파워를 설계한 고역 통과 필터에 통과시켜 허위표적을 제거하여 실 표적을 추출한다. 전산 모의실험에서 제안된 방법의 적용 전후를 비교 분석하여 제안된 방법이 평균 8 dB 이상 허위표적을 감쇄시키는 것을 보였다.

키워드

좌 우 구분

비선형 배열

활 형상 배열

빔패턴 주파수 분해 기법

References

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2.Y. J. Son, S. Y. Chun and K. M. Kim, “Signal processing for improvement of resolution and direction ambiguity of source in line array” (in Korean), J. Acoust. Soc. Kr. 22, 482-488 (2003).

3.S. I. Kim, K. C. Dho, W. T. Oh, D. H. Youn and C. Y. Lee, “A beamforming method for a perturbed linear towed array” (in Korean), J. Acoust. Soc. Kr. 21, 478-484 (2002).

4.R. A. Wagstaff and P. Zanasca, “Spatial-gain improvement resulting from left/right discriminating elements of an underwater towed array,” SACLANT ASW Res. Cen. 15, 50 (1981).

5.W. S. Hodgkiss, “The effects of array shape perturbation on beamforming and passive ranging,” IEEE J. Oceanic Eng. 8, 120-130 (2003).

6.D. M. Caveny, D. R. Del Balzo, J. H. Leclere, and G. E. Loup, “Performance of sinusoidally deformed hydrophone line arrays,” J. Acoust. Soc. Am. 104, 2203-2209 (1998).

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 :1
Pages :49-56
Received Date : 2016-12-15
Revised Date : 2016-12-28
Accepted Date : 2017-01-25
DOI :https://doi.org/10.7776/ASK.2017.36.1.039

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

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