Covariance-based source localization performance improvement for underwater ultra-short baseline systems

Sangman Han; Minhyuk Cha; Haklim Ko; Hojun Lee

doi:10.7776/ASK.2024.43.1.089

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2024 Vol.43, Issue 1 Preview Page Next Page

Research Article

Covariance-based source localization performance improvement for underwater ultra-short baseline systems 공분산 기반 수중 ultra-short baseline 시스템의 위치 추정 성능 개선 기법

31 January 2024. pp. 89-94

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Abstract

Since Ultra-Short BaseLine (USBL) uses an array with narrow sensor spacing, precise synchronization is required to improve source localization performances. However, in the underwater environment, synchronization errors occur due to relatively strong noise and underwater acoustic channels such as multipath and Doppler, which deteriorates the source localization performances. This paper proposes a covariance-based synchronization compensation method to improve the source localization performances of the underwater USBL systems. The proposed method arranges the received signals through cross-correlation and calculates the covariance of the arranged signals. The synchronization error is related to the phase difference in the covariance. Thus, the phase difference is estimated as the covariance and compensated. Computer simulations demonstrate that the proposed method has better source localization performances than the conventional cross-correlation method.

Keywords

Ultra-Short BaseLine (USBL)

Synchronization

Covariance

Cross-correlation

Source localization

Ultra-Short BaseLine(USBL) 은 센서 간격이 좁은 배열을 사용하기 때문에 위치 추정 성능 향상을 위해서는 정밀한 동기화가 필요하다. 그러나 수중 환경은 비교적 강한 잡음과 다중 경로 및 도플러 등의 수중 음향 채널로 인해 동기화 오류가 발생하여 위치 추정 성능이 저하된다. 본 논문에서는 수중 USBL 시스템의 위치 추정 성능을 향상시키기 위한 공분산 기반 동기 보상 기법을 제안한다. 제안 방법은 상호상관을 통해 신호를 정렬한 후, 정렬된 신호의 공분산을 계산한다. 공분산에서 동기 오차는 위상차와 선형적으로 관련되어 있으므로 위상차를 공분산으로부터 추정하여 동기 오차를 보상한다. 전산 모의실험을 통해 제안 방법이 기존 상호상관 방법보다 우수한 위치 추정 성능을 가지는 것을 보였다.

키워드

Ultra-Short BaseLine (USBL)

동기

공분산

상호상관

신호원 위치 추정

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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 :89-94
Received Date : 2023-11-07
Revised Date : 2023-12-11
Accepted Date : 2023-12-12
DOI :https://doi.org/10.7776/ASK.2024.43.1.089

The Journal of the Acoustical Society of KoreaISSN:1225-4428(Print) 2287-3775(Online)한국음향학회

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