NDLI: Source speed estimation using a pilot tone in a high frequency acoustic modem

Content Provider	IEEE Xplore Digital Library
Author	Kathiroli, P. Beaujean, P.-P.J. Xiros, N.
Copyright Year	2011
Description	Author affiliation: Department of Ocean and Mechanical Engineering, Florida Atlantic University, SeaTech Research Center, 101, North Beach Road, Dania Beach 33004, USA (Kathiroli, P.; Beaujean, P.-P.J.) \|\| Department of Aerospace and Ocean Engineering, Virginia Tech, 215 Randolph Hall (0203), Blacksburg, 24061, USA (Xiros, N.)
Abstract	In this paper, the authors propose to estimate the Doppler velocity of a moving high-frequency underwater acoustic modem source. Hermes, as this modem is known, currently uses a robust moving average estimate for Doppler compensation. A new auto-regressive approach to Doppler estimation provides better estimates. Simulation results indicate that, at a constant velocity of 2 m/s and in the presence of additive noise (with a signal-to-noise ratio of 75 dB), the Doppler velocity is estimated with an RMSE of 0.23 m/s using moving average vs. 0.00018 m/s for the auto-regressive approach. An experiment was also conducted to compare the estimated Doppler velocity obtained using the two algorithms. The setup consisted of a receiver hydrophone attached to a towing carriage that moved with a known velocity relative to a stationary acoustic source. The source transmitted 375 kHz pilot tone. The accuracy of the algorithms was compared against the true velocity values of the carriage in the presence of noise and multipath. At a constant velocity of 0.4 m/s and for a signal-to-noise and interference ratio of 6.3 dB, the RMSE was 0.6055 m/s using moving average vs. 0.0780 m/s using auto regressive approach.
Starting Page	1
Ending Page	8
File Size	1149416
Page Count	8
File Format	PDF
ISBN	9781457714276
e-ISBN	9780933957398
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-19
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	MTS
Subject Keyword	Signal to noise ratio Receivers Acoustics Doppler shift Estimation Modems Modem Doppler High Frequency Acoustic
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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