NDLI: Ocean surface wave measurements using a small autonomous underwater vehicle

Content Provider	IEEE Xplore Digital Library
Author	Earle, M.D. Borgman, L.E. Mettlach, T.R.
Copyright Year	2002
Description	Author affiliation: Neptune Sci., Inc., Slidell, LA, USA (Earle, M.D.)
Abstract	Small Autonomous Underwater Vehicle (AUV) capabilities are advancing rapidly and small AUV's are being used increasingly to collect many types of oceanographic data. Techniques have been developed, tested by wave simulations, and preliminarily field tested to provide ocean surface wave information, including directional wave spectra, using small AUV's. The techniques are adaptable to several small AUV's being developed and operated by the U.S. Navy. Either one or two small pressure sensors attached to an AUV's hull are utilized. Using two sensors along an AUV's bow-stern axis constitutes a moving slope array for one of the data analysis methods. After corrections for wave-induced vehicle motions measured by small accelerometers and angular rate sensors, three different data processing methods can provide wave information. The first method provides key wave height, period, and direction parameters. The second method treats the corrected wave data as a moving slope array. Both of these methods correct for Doppler shifts caused by an AUV's velocity while it maintains a nearly constant depth. The third method treats the wave motion-corrected wave data as an array of many point measurements made by non-stationary wave sensors with their horizontal positions known as functions of time. Doppler shifts do not occur due to this method's mathematical formulation. The required sensors and a data acquisition/processing system have been integrated into a small AUV used as a test vehicle and the system is being used to collect preliminary field data. The small AUV wave measurement system can be used for coastal wave mapping to support military operations, coastal processes studies, and driving nearshore models such as surf models and sediment transport models.
Starting Page	272
Ending Page	276
File Size	366385
Page Count	5
File Format	PDF
ISBN	0780375343
DOI	10.1109/OCEANS.2002.1193283
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-10-29
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Oceans Surface waves Sea surface Sea measurements Underwater vehicles Sensor arrays Testing Doppler shift Data analysis Accelerometers
Content Type	Text
Resource Type	Article

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