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2012 Vol.31, Issue 4
Measurement of Spatial Coherence of Active Acoustic Sensor Array Signal

능동 음향센서 배열신호의 공간 상관성 측정

Joung-Soo Park1*
,
Hyoung Rok Kim1
박 정수1*
,
김 형록1
1국방과학연구소
*Corresponding Author
31 May 2012. pp. 205-213
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Abstract

Active acoustic array signal was measured in the East Sea and the South sea and spatial coherence was analyzed. The measurement of ambient noise, target reflection signal, sea surface backscattering signals took place including environmental measurements of sea wind, and vertical temperature profiles. The spatial coherence of ambient noise was lower than that of target reflection signal in the South Sea. The spatial coherence of target reflection signal was above 0.5 over all array length. The spatial coherence of sea surface backscattering signal was higher in high incident angle. The maximum non-dimensional array length was 3.0 (26°) and 3.5 (32°) to have spatial coherence above 0.5 in the East Sea. To find a design criteria for array configuration and array performance, more measurements of temporal and spatial coherence will be needed continuously in the future.

Keywords
Mid-frequency
Acoustic sensor array
Spatial coherence
Ambient noise
Reverberation

동해와 남해에서 능동 음향센서 배열 신호를 측정하고, 신호의 공간 상관성을 분석하였다. 주변소음, 표적신호, 해수면과 후방산란 신호, 해상풍, 수직 수온을 25시간 동안 동시에 관측하였다. 남해 측정에서는 분석결과로 부터 주변소음의 공간 상관성이 표적신호 보다 매우 낮고, 표적신호는 전체 음향센서에서 0.5 이상의 상관성을 보였다. 동해 측정에서는 해수면 잔향 신호의 공간 상관성은 해수면 입사각이 클때 높고, 상관성이 0.5이상인 무차원화된 배열의 최대길이는 26도의 입사각에서 3.0, 32도의 입사각에서 3.5였다. 배열센서의 형상과 배열성능을 결정하는 기준이 되는 공간 상관성 파악을 위해서는 향후에 다양한 시공간 변동을 포함한 지속적인 관측이 필요하다.

키워드
중주파수
음향센서 배열
공간 상관성
주변소음
잔향음
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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 : 31
  • No :4
  • Pages :205-213
  • Received Date : 2012-04-03
  • Accepted Date : 2012-05-02
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