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2018 Vol.37, Issue 1 Preview Page
Detection of low frequency tonal signal of underwater radiated noise via compressive sensing

압축센싱 기법을 적용한 선박 수중 방사 소음 신호의 저주파 토널 탐지

Jinhong Kim1
,
Byonghyo Shim1
,
Jae-Kyun Ahn2
,
Seongil Kim2
,
Wooyoung Hong3*
김 진홍1
,
심 병효1
,
안 재균2
,
김 성일2
,
홍 우영3*
3Department of Defense Systems Engineering, Sejong University
1서울대학교 전기정보공학부
2국방과학연구소
3세종대학교 국방시스템공학과
*교신저자. *Corresponding Author. 
31 January 2018. pp. 39-45
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Abstract

Compressive sensing allows recovering an original signal which has a small dimension of the signal compared to the dimension of the entire signal in a short period of time through a small number of observations. In this paper, we proposed a method for detecting tonal signal which caused by the machinery component of a vessel such as an engine, gearbox, and support elements. The tonal signal can be modeled as the sparse signal in the frequency domain when it compares to whole spectrum range. Thus, the target tonal signal can be estimated by S-OMP (Simultaneous-Orthogonal Matching Pursuit) which is one of the sparse signal recovery algorithms. In simulation section, we showed that S-OMP algorithm estimated more precise frequencies than the conventional FFT (Fast Fourier Transform) thresholding algorithm in low SNR (Signal to Noise Ratio) region.

Keywords
Passive sonar
Tonal signal detection
Compressive sensing
S-OMP (Simultaneous-Orthogonal Matching Pursuit)

압축센싱을 적용하면 전체 신호의 차원 대비 실제 사용하는 신호의 차원이 작은 희소신호의 경우, 적은 수의 관측치를 통하여 빠른 시간 내에 복원이 가능하다. 수중 표적의 기어박스 및 보조 장치 등으로부터 방사되는 신호의 토널 주파수 성분들은 처리하고자 하는 주파수 대역에서 상대적으로 주파수 성분이 적다. 따라서 토널 신호는 주파수 영역 전체 대비 희소신호로 모델링 될 수 있으므로 희소 신호 복원 알고리듬인 S-OMP(Simultaneous-Orthogonal Matching Pursuit)를 이용하여 복원할 수 있다. 본 논문에서는 압축센싱 기법을 이용하여 수중 표적의 방사 소음 신호의 토널 주파수를 검출하는 기법을 제안하고 모의 실험을 통해 성능을 확인한다. 모의실험에서 기존의 FFT(Fast Fourier Transform) 임계치 기법을 이용한 방법에 비해 낮은 SNR(Signal to Noise Ratio)에서도 정확한 토널 성분을 추정 할 수 있음을 확인하였다.

키워드
수동소나
토널 신호 검출
압축센싱
S-OMP (Simultaneous-Orthogonal Matching Pursuit)
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 : 37
  • No :1
  • Pages :39-45
  • Received Date : 2017-10-31
  • Accepted Date : 2018-01-30
  • DOI :https://doi.org/10.7776/ASK.2018.37.1.039
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