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2017 Vol.36, Issue 4 Preview Page
Reverberation suppression algorithm for continuous-wave active sonar system based on overlapping nonnegative matrix factorization

중첩 비음수 행렬 분해 기법에 기반한 지속파 능동 소나의 잔향 신호 제거 기법

Seokjin Lee1*
,
Jun-Seok Lim2
,
Myoung Jun Cheong3
이 석진1*
,
임 준2
,
정 명준3
1경기대학교 전자공학과
2세종대학교 전자정보통신공학과
3국방과학연구소
*교신저자. *Corresponding Author. 
31 July 2017. pp. 273-278
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Abstract

In this paper, a post-processing algorithm to suppress reverberation for continuous-wave active sonar system is developed. The developed algorithm is designed for a low-doppler environment where the target echo is not distinguishable from the reverberation. The algorithm is developed based on overlapping nonnegative matrix factorization method. The algorithm analyzes the frequency characteristics of transmitting ping signal, then suppresses the reverberation using time-frequency characteristics of the received signal. Simulations performed in order to evaluate the proposed algorithm, and the results show that the proposed algorithm makes 6 dB signal-to-reverberation ratio enhancement in various reverberation energy conditions.

Keywords
Active sonar
Continuous wave
Reverberation suppression
Nonnegative matrix factorization

본 논문에서는 지속파 능동 소나의 수신된 신호에서 잔향 신호를 제거하는 후처리 알고리즘을 도출하고자 하며, 제안하는 알고리즘은 작은 도플러효과가 존재하여 목표물로부터 반사된 핑 신호가 잔향신호와 잘 구분이 되지 않는 경우를 목표로 하여 고안되었다. 본 알고리즘은 중첩 비음수 행렬 분해 기법에 기반하고 있으며, 방사될 핑 신호의 주파수 특성을 분석한 후, 수신된 신호의 시간-주파수 영역 특성을 이용하여 잔향 신호를 제거하고 핑 신호를 복원한다. 알고리즘의 효과를 분석하기 위하여 시뮬레이션을 수행하였으며, 시뮬레이션 결과 다양한 진향 신호 에너지 환경에서 6 dB 가량의 신호대잔향비 성능 향상을 보임을 확인할 수 있었다.

키워드
능동 소나
지속파
잔향 제거
비음수 행렬 분해
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 :4
  • Pages :273-278
  • Received Date : 2017-03-10
  • Revised Date : 2017-04-17
  • Accepted Date : 2017-07-31
  • DOI :https://doi.org/10.7776/2017.36.4.273
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