한국해양대학교

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힐베르트 변환과 포락선을 이용한 시간 지연 추정

Title
힐베르트 변환과 포락선을 이용한 시간 지연 추정
Author(s)
정동환
Keyword
시간지연추정, Time delay estimation, Time delay, Hilbert transform, envelope
Publication Year
2017
Publisher
한국해양대학교 일반대학원
URI
http://repository.kmou.ac.kr/handle/2014.oak/11415
http://kmou.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000002331682
Abstract
Time delay estimation of an acoustical signal in an ocean environment is a challenging problem because of the phase distortion of the received signal due to reflection or transmission by the sea surface and seabed.

In this thesis, the conventional time delay estimation methods based on the cross-correlation and Hilbert transform are reviewed, and an improved algorithm to enhance the accuracy of time delay is presented. The presented algorithm is based on the Hilbert transform of the envelope of the received signal. The advantage of this technique is demonstrated by the mathematical formulation and consequently, the numerical simulations are performed for the cases of various SNR(signal-to-noise ratio) conditions. The simulation results are compared with those of existing techniques such as cross-correlation, zero crossing of Hilbert transform.
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해양공학과 > Thesis
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