Distributed underwater sensors are expected to provide oceanographic monitoring over large areas. As fabrication technology advances, low cost sensors will be available for many uses. The sensors communicate to each other and are networked using acoustic communications. This paper first studies the performance of such systems for current measurements using tomographic inversion approaches to compare with that of a conventional system which distributes the sensors on the periphery of the area of interest. It then proposes two simple signal processing methods for ocean current mapping (using distributed networked sensors) aimed at real-time in-buoy processing. Tomographic inversion generally requires solving a challenging high dimensional inverse problem, involving substantial computations. Given distributed sensors, currents can be constructed locally based on data from neighboring sensors. It is shown using simulated data that similar results are obtained using distributed processing as using conventional tomographic approaches. The advantage for distributed systems is that by increasing the number of nodes, one gains a much more improved performance. Furthermore, distributed systems use much less energy than a conventional tomographic system for the same area coverage. Experimental data from an acoustic communication and networking experiment are used to demonstrate the feasibility of acoustic current mapping.
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September 2013
September 01 2013
Acoustic mapping of ocean currents using networked distributed sensors
Chen-Fen Huang;
Chen-Fen Huang
Institute of Oceanography, National Taiwan University
, Taipei 10617, Taiwan
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T. C. Yang;
T. C. Yang
a)
Institute of Applied Marine Physics and Undersea Technology, National Sun Yat-sen University
, Kaohsiung 80424, Taiwan
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Jin-Yuan Liu;
Jin-Yuan Liu
b)
Institute of Applied Marine Physics and Undersea Technology, National Sun Yat-sen University
, Kaohsiung 80424, Taiwan
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Jeff Schindall
Jeff Schindall
Naval Research Laboratory
, 4555 Overlook Avenue SW, Washington, DC 20375
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a)
Author to whom correspondence should be addressed. Electronic mail: [email protected]
b)
Also at: National Taitung University, Taitung 95092, Taiwan.
J. Acoust. Soc. Am. 134, 2090–2105 (2013)
Article history
Received:
November 23 2012
Accepted:
July 18 2013
Citation
Chen-Fen Huang, T. C. Yang, Jin-Yuan Liu, Jeff Schindall; Acoustic mapping of ocean currents using networked distributed sensors. J. Acoust. Soc. Am. 1 September 2013; 134 (3): 2090–2105. https://doi.org/10.1121/1.4817835
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