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2017 Vol.36, Issue 6 Preview Page
Optimization of flow performance by designing orifice shape of outdoor unit of air-conditioner

블라인드 디컨볼루션 및 time of arrival 기법을 이용한 수중 표적 거리 추정 성능 향상 기법

Min Su Han1*
,
Jea Young Choi1
,
Kweon Son1
,
Phil Ho Lee1
한 민수1*
,
최 재용1
,
손 권1
,
이 필호1
1Agency Defence Development
1국방과학연구소 수중방사소음팀
*교신저자. *Corresponding Author. 
30 November 2017. pp. 378-386
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Abstract

Accurate distance measurement between maneuver target in underwater and measuring devices is required to perform quantitative test evaluation in marine weapons system R&D process. In general, the target distance is measured using a one-way ToA (Time of Arrival) method that calculates the time difference between transmitted and received signals from the two accurately synchronized devices. However, the distance estimation performance is degraded because of the multi-path environments. In this paper, the time–variant transfer function of complex underwater environment is estimated from each received data frame using RBD (Ray-based Blind Deconvolution), and the estimated time-variant transfer function is then used to get rid of the effect about complex underwater environment and to recover the data signal using PTRM (Passive Time Reversal Mirror). The result from the simulation and experimental data show that the suggested method improve the distance estimation performance when comparing with the conventional ToA method.

Keywords
ToA (Time of Arrival)
RBD (Ray-based Blind Deconvolution)
Beamforming
Channel impulse response

해양무기체계 연구개발 과정에 있어서 정량적 시험평가를 수행하기 위해 수중에서 기동하는 표적과 계측 장비간의 거리측정이 요구된다. 일반적으로 정확하게 동기화된 송‧수신기 사이의 전송 시간차를 측정하는 단방향 ToA(Time of Arrival) 기법을 이용하여 목표물의 거리를 측정한다. 하지만 수신된 신호는 다중경로의 영향으로 왜곡되어 거리 추정 성능을 저하시킨다. 본 논문에서는 음선 기반의 블라인드 디컨볼루션 기법을 사용하여 수신된 각 데이터 프레임으로부터 시변하는 복합 수중 채널 함수를 추정하고 추정된 시변 전달 함수를 시역전하여 다중경로 현상을 제거한다. 제안된 기법으로 시뮬레이션 및 해상실험을 진행하였을 때, 기존의 ToA 기법보다 거리 추정 성능이 향상되는 결과를 확인하였다.

키워드
도착 시간
음선기반 블라인드 디컨볼루션
빔형성
채널 임펄스 응답
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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 :6
  • Pages :378-386
  • Received Date : 2017-08-09
  • Revised Date : 2017-08-29
  • Accepted Date : 2017-11-29
  • DOI :https://doi.org/10.7776/ASK.2017.36.6.378
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