Wiener filtering-based ambient noise reduction technique for improved acoustic target detection of directional frequency analysis and recording sonobuoy

Jungpyo Hong; Inyeong Bae; Jongwon Seok

doi:10.7776/ASK.2022.41.2.192

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2022 Vol.41, Issue 2 Preview Page Next Page

Research Article

Wiener filtering-based ambient noise reduction technique for improved acoustic target detection of directional frequency analysis and recording sonobuoy Directional frequency analysis and recording 소노부이의 표적 탐지 성능 향상을 위한 위너필터링 기반 주변 소음 제거 기법

31 March 2022. pp. 192-198

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Abstract

As an effective weapon system for anti-submarine warfare, DIrectional Frequency Analysis and Recording (DIFAR) sonobuoy detects underwater targets via beamforming with three channels composed of an omni-direcitonal and two directional channels. However, ambient noise degrades the detection performance of DIFAR sonobouy in specific direction (0°, 90°, 180°, 270°). Thus, an ambient noise redcution technique is proposed for performance improvement of acoustic target detection of DIFAR sonobuoy. The proposed method is based on OTA (Order Truncate Average), which is widely used in sonar signal processing area, for ambient noise estimation and Wiener filtering, which is widely used in speech signal processing area, for noise reduction. For evaluation, we compare mean square errors of target bearing estmation results of conventional and proposed methods and we confirmed that the proposed method is effective under 0 dB signal-to-noise ratio.

Keywords

DIrectional Frequency Analysis and Recording (DIFAR) sonobuoy

Ambient noise reduction

Wiener filtering

Order Truncate Average (OTA)

DIrectional Frequency Analysis and Recording(DIFAR) 소노부이는 대잠전에 효과적인 무기체계로 하나의 무지향성 센서와 두 개의 지향성 센서로 구성된 3채널 빔형성을 통해 표적의 방향을 탐지한다. 하지만, 주변 소음의 영향으로 DIFAR소노부이의 특정방위(0°, 90°, 180°, 270°) 표적 탐지 성능이 저하되는 단점이 있다. 따라서, 본 논문에서는 주변 소음을 추정하고 제거를 통해 DIFAR 소노부이의 표적 탐지 성능을 향상시키는 방법을 제안하였다. 주변소음 추정을 위해 소나신호처리에서 널리 쓰이는 Order Truncate Average(OTA)기법을, 추정된 소음을 제거하기 위해 음성신호처리에서 널리 쓰이는 위너필터링 기법을 사용하였다. 제안한 방법을 평가하기 위해 표적 방위추정 결과의 평균 제곱 오차를 비교한 결과 신호대잡음비 0 dB이하에서 제안한 방법이 효과적임을 확인할 수 있었다.

키워드

DIrectional Frequency Analysis and Recording (DIFAR) 소노부이

주변잡음제거

위너필터링

Order Truncate Average (OTA)

References

R. A. Holler, "The evolution of the sonobuoy from World War II to The Cold War," U.S. Navy Journal of Underwater Acoustics, 322-346 (2014).

D. Desrochers, High resolution beamforming techniques applied to a DIFAR sonobuoy, (Master's thesis, Royal Military College of Canada, 1999).

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D. -H. Chang, H.. -B. Park, Y. -N. Na, and J. -H. Ryu, "Bearing estimation of narrow band acoustic signals using cardioid beamroming algorithm in shallow water" (in Korean), J. Acoust. Soc. Kr. 21, 71-80 (2002).

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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 : 41
No :2
Pages :192-198
Received Date : 2022-01-17
Revised Date : 2022-03-07
Accepted Date : 2022-03-10
DOI :https://doi.org/10.7776/ASK.2022.41.2.192

The Journal of the Acoustical Society of Korea ISSN:1225-4428(Print) 2287-3775(Online) 한국음향학회지

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