The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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The relationship between the array invariant-based ranging and the effective range in a weakly range-dependent environment

거리 종속 환경에서의 배열 불변성 기반 거리추정과 상응 거리와의 관계

  • 김동현 (한국해양대학교 수중운동체특화연구센터) ;
  • 변기훈 (한국해양대학교 해양과학기술융합학과) ;
  • 김대환 (한국해양대학교 해양공학과) ;
  • 김재수 (한국해양대학교 해양공학과)
  • Received : 2024.05.08
  • Accepted : 2024.07.22
  • Published : 2024.07.31
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Abstract

In shallow water, the array invariant, known as the effective range estimation method, is developed based on the broadband dispersion characteristics in an ideal waveguide, which can be summarized by the waveguide invariant. It is robust enough to estimate both the array tilt and range simultaneously, even in situations where array tilt exists. Recently, it has been extended to fully consider the angle dependence of the waveguide invariant. However, applying the array invariant in range-dependent environments instead of range-independent environments can lead to range estimation errors due to bathymetry mismatch. In this paper, we interpret such range estimation errors by introducing the concept of effective range. Through numerical simulations and experimental data in a weakly range-dependent environment, we demonstrate the relationship between range estimation errors and effective range.

천해역에서 효과적인 거리추정 방법으로 알려진 배열 불변성은 도파관 불변성으로 요약될 수 있는 이상적인 도파관 내에서의 광대역 확산 특징을 기반으로 개발되었으며, 배열 기울기가 존재하는 상황에서도 배열 기울기와 거리를 동시에 추정할 정도로 강인하다. 최근에는 도파관 불변성의 각도 종속성을 완전히 고려할 수 있도록 확장되었다. 하지만, 거리-종속 환경에 대해 거리-독립 환경의 배열 불변성 기법을 적용한다면, 해저 지형 오정합에 의해 거리추정오차가 발생하게 된다. 본 논문에서는 이러한 거리추정 오차를 상응 거리 개념을 도입하여 해석하고자 한다. 거리-종속 환경에서의 수치 시뮬레이션 수행과 해상 실험 데이터를 통해 거리추정의 오차와 상응 거리 사이의 관계를 입증하였다.

Keywords

Acknowledgement

이 논문은 2022학년도 한국해양대학교 신진교수 정착연구지원사업 연구비의 지원을 받아 수행된 연구임.

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