Characteristics of source localization with horizontal line array using frequency-difference autoproduct in the East Sea environment

Joung-Soo Park; Jungyong Park; Su-Uk Son; Ho Seuk Bae; Keun-Wha Lee

doi:10.7776/ASK.2024.43.1.029

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2024 Vol.43, Issue 1 Preview Page Next Page

Research Article

Characteristics of source localization with horizontal line array using frequency-difference autoproduct in the East Sea environment 동해 환경에서 차주파수 곱 및 수평선배열을 이용한 음원 위치추정 특성

31 January 2024. pp. 29-38

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Abstract

The Matched Field Processing (MFP) is an estimation method for a source range and depth based on the prediction of sound propagation. However, as the frequency increases, the prediction inaccuracy of sound propagation increases, making it difficult to estimate the source position. Recently proposed, the Frequency-Difference Matched Field Processing (FD-MFP) is known to be robust even if there is a mismatch by applying a frequency-difference autoproduct extracted from the auto-correlation of a high frequency signal. In this paper, in order to evaluate the performance of the FD-MFP using a horizontal line array, simulations were conducted in the environment of the East Sea of Korea. In the area of Bottom Bounce (BB) and Convergence Zone (CZ) where detection of a sound source is possible at a long range, and the results of localization were analyzed. According to the the FD-MFP simulations of horizontal line array, the accuracy of localization is similar or degraded compared to the conventional MFP due to diffracted field and mismatch of sound speed. There was no clear result from the simulations conforming that the FD-MFP was more robust to mismatch than the conventional MFP.

Keywords

Frequency-difference autoproduct

Frequency-difference matched field processing

Source localization

Mismatch

정합장처리(Matched Field Processing, MFP)는 음파전달 예측을 기반으로 음원의 거리와 심도를 추정하는 기법이다. 그러나 주파수가 높아지면 음파전달 예측의 부정확성이 증가하여 음원위치 추정이 어렵다. 최근에 제안된 차주파수 정합장처리(Frequency-difference Matched Field Processing, FD-MFP)는 고주파 신호의 자기상관으로 부터 추출한 차주파수 곱을 적용함으로써 음속의 오정합 등이 있어도 강인하다고 알려졌다. 본 논문에서는 수평선배열센서에서 차주파수 정합장처리의 성능을 알아보기 위하여, 동해의 환경에서 시뮬레이션을 수행하였다. 장거리 탐지가 가능한 해저면반사(Bottom Bounce, BB)와 수렴구역(Convergence Zone, CZ)이 발생하는 영역에서 위치추정 결과를 분석하였다. 수평선배열센서의 차주파수 정합장처리의 위치추정 정확도는 회절음장과 음속의 오정합에 의해 기존의 정합장처리에 비해 유사하거나 낮아졌다. 시뮬레이션으로부터 차주파수 정합장처리가 기존의 정합장처리보다 오정합에 강인하다는 명확한 결과는 볼 수 없었다.

키워드

차주파수 곱

차주파수 정합장처리

음원 위치추정

오정합

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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 : 43
No :1
Pages :29-38
Received Date : 2023-08-31
Revised Date : 2023-10-25
Accepted Date : 2023-12-06
DOI :https://doi.org/10.7776/ASK.2024.43.1.029

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

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