Period estimation in broadband propeller noise using auto-correlation and adaptive line enhancement

Jun-Seok Lim; Keunhwa Lee

doi:10.7776/ASK.2025.44.5.482

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2025 Vol.44, Issue 5 Preview Page Next Page

Research Article

Period estimation in broadband propeller noise using auto-correlation and adaptive line enhancement 자기 상관과 적응형 회선 잡음 개선기를 이용한 광대역 프로펠러 소음의 주기 추정

30 September 2025. pp. 482-488

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Abstract

Detection of Envelope Modulation On Noise (DEMON) processing technique for the underwater target detection analyzes envelope modulation induced by propeller cavitation to extract propeller-related information. Existing DEMON processing that applies the autocorrelation technique is effective in highlighting the periodicity of the envelope, but its performance improvement is limited in low signal-to-noise ratio environments. This paper proposes a novel approach that integrates autocorrelation with Adaptive Line Enhancement (ALE) in a single-channel DEMON processing architecture. ALE employs adaptive filtering to enhance the SNR of weak periodic signals buried in strong broadband noise. The proposed method achieves 2 dB ~ 5 dB reduction in ambient noise compared to conventional autocorrelation-based DEMON processing.

Keywords

Sonar signal processing

Detection of Envelope Modulation On Noise (DEMON)

Adaptive Line Enhancement (ALE)

Auto-correlation

수중 표적 탐지를 위한 데몬(Detection of Envelope Modulation On Noise, DEMON) 처리 기법은 프로펠러 캐비테이션으로 인한 포락선 변조를 분석하여 프로펠러 관련 정보를 추정한다. 기존 자기 상관 기법을 적용한 데몬 처리는 포락선의 주기성 부각에 효과적이나, 낮은 신호 대 잡음 비율 환경에서는 성능 개선 효과가 제한된다. 본 연구는 단일 채널 데몬 구조에 자기 상관과 적응형 회선 잡음 개선기(Adaptive Line Enhancement, ALE)를 결합한 새로운 기법을 제안한다. ALE는 적응 필터를 통해 광대역 잡음 환경에서 약한 주기성 신호의 신호 대 잡음 비율을 개선한다. 제안된 방법은 기존 자기 상관 데몬 처리 대비 2 dB ~ 5 dB의 주변 잡음 감소 효과 개선을 달성하였다.

키워드

소나 신호 처리

데몬

적응형 회선 잡음 개선기

자기 상관

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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 : 44
No :5
Pages :482-488
Received Date : 2025-07-04
Accepted Date : 2025-08-01
DOI :https://doi.org/10.7776/ASK.2025.44.5.482

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

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