Doppler shift frequency estimation using single chirp and continuous wave replica

Dan-bi Ou; Ki-man Kim; Jun-ho Kim; Byoung-sun Ahn

doi:10.7776/ASK.2025.44.4.384

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2025 Vol.44, Issue 4 Preview Page Next Page

Research Article

Doppler shift frequency estimation using single chirp and continuous wave replica 단일 처프와 continuous wave 리플리카를 이용한 도플러 천이 주파수 추정

31 July 2025. pp. 384-391

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Abstract

Doppler estimation in underwater environments is essential for analyzing channel characteristics and enhancing communication. Commonly chirp signals such as Linear Frequency Modulated (LFM) signals have been used, and the most widely known method is to measure the cross-correlation with its replica at the receiver or to estimate the Doppler shift frequency by concatenating different types of chirp signals. In this paper, we propose a Doppler shift frequency estimation method based on the change in the frequency characteristics of a single LFM signal at the receiver. The proposed method configures a replica using a Continuous Wave (CW) signal to estimate the first Doppler shift frequency, and then goes through a correction process through curve fitting. It was confirmed through simulations that the proposed method reduces the computational load by about 72% compared to the previous method when estimating the Doppler frequency.

Keywords

Doppler shift frequency

Linear Frequency Modulated (LFM)

Continuous Wave (CW)

Replica

Curve fitting

수중 환경에서의 도플러 천이 주파수 추정은 채널 특성을 분석하고, 통신 성능을 향상시키기 위한 중요한 단계이다. 주로 Linear Frequency Modulated(LFM) 신호와 같은 처프 신호가 사용되었으며, 수신단에서 이의 리플리카(replica)와 상호상관도를 측정하거나 다른 형태의 처프 신호를 연접하여 도플러 천이 주파수를 추정하는 것이 가장 널리 알려진 방법이다. 본 논문에서는 하나의 LFM 신호를 이용하면서 수신단에서 이 신호의 주파수 특성 변화를 기반으로 하는 도플러 천이 주파수 추정 방법을 제안한다. 제안한 방법은 Continuous Wave(CW) 신호를 사용하여 리플리카를 구성하여 1차 도플러 천이 주파수를 추정하며, 이후 곡선 적합을 통해 보정 과정을 거친다. 제안한 방법을 이용하여 도플러 천이 주파수를 추정하는 경우 기존의 방법에 비해 약 72 %의 계산량 감소를 나타내는 것을 모의실험을 통해 확인하였다.

키워드

도플러 천이 주파수

선형 주파수 변조

연속 신호

리플리카

곡선 적합

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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 :4
Pages :384-391
Received Date : 2025-04-24
Revised Date : 2025-06-13
Accepted Date : 2025-06-15
DOI :https://doi.org/10.7776/ASK.2025.44.4.384

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

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