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Estimation of Time Difference Using Cross-Correlation in Underwater Environment

수중 환경에서 상호상관을 이용한 시간차이 추정

Lee, Young-Pil;Moon, Yong Seon;Ko, Nak Yong;Choi, Hyun-Taek;Lee, Jeong-Gu;Bae, Young-Chul
이영필;문용선;고낙용;최현택;이정구;배영철

  • Received : 2016.02.26
  • Accepted : 2016.04.22
  • Published : 2016.04.30

Abstract

Recently, underwater acoustic communication (UWAC) has been studied by many scholars and researchers. In order to use UWAC, we need to estimate time difference between the two signals in underwater environment. Typically, there are major three methods to estimate the time-difference between the two signals such as estimating the arrival time of the first non-background segment and calculate the temporal difference, calculating the cross-correlation between the two signal to infer the time-lagged, and estimating the phase delay to infer the time difference. In this paper, we present calculating the cross-correlation between the two signals to infer the time-lagged to apply UWAC. We also present the experimental result of estimating the arrival time by using cross-correlation. We get EXCORR = 0.003055 second as the estimation error in mean absolute difference.

Keywords

Cross-correlation;Time difference;Underwater acoustic communication;Underwater environment;Hydrophone

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Acknowledgement

Grant : R&D center for underwater construction robotics

Supported by : Korea Institute of Marine Science &Technology Promotion(KIMST)