The document presents a wireless optical communication and localization system for underwater wireless sensor networks. It describes a node design with multiple optical transceivers for omni-directional communication that can automatically switch transceivers to maintain reliable data transmission as nodes move. Each transceiver has two photodiodes to detect signal strength for distance estimation and 2D node localization calculation. The system achieves reliable communication through an optical communication protocol and localization is demonstrated through simulation experiments.

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E-mail: lfeng.luo@yahoo.com
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The Design and Implement of an Underwater Wireless Optical Communication and
Localization System
Luo Linfeng, Wang Shuo
Complex System and Intelligent Science Lab, Institute of Automation, CAS, Beijing
E-mail: lfeng.luo@yahoo.com
Abstract: In this paper, a node’s wireless optical communication module scheme for underwater wireless sensor
networks is presented and partly realized. And a distance measurement and 2-Dimension localization algorithm is
integrated in the scheme. The module scheme has the following features: the module consists of multiple optical
transceivers for omni-direction communication; it can keep data transmission reliable by automatically switching the
transceivers in case of nodes’ relative position change. Two photodiodes, which detect the optical signal strength for
distance estimation, are installed on each transceiver. The 2-Dimension relative positioning among nodes can be
calculated by the detected optical signal strength of the photodiodes.
Keywords: wireless optical communication, underwater, distance measurement, localization
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[1] Maurice Tivey, Paul Fucile, and Enid Sichel. A Low
10 A B C Power, Low Cost, Underwater Optical Communication
C A B System. Ridge 2000 Events, 2(1): 27-29, 2004
' ' ' [2] F. Schill, U. Zimmer, and J. Trumpf . Visible spectrum
IA IB IA = I A
optical communications and distance sensing for
' underwater applications. In Proc. Australian Conf.
IB = IB 10 Robotics and Automation (Canberra, 2004)
A B [3] I. Vasilescu, K. Kotay, D. Rus, M. Dunbabin, and P.
A B Corke. Data collection, storage, and retrieval with an
C 11 underwater sensor network. Sensys’05. 2005
[4] Vasilescu, I., Varshavskaya, P., Kotay, K., and Rus, D.
Autonomous modular optical underwater robot (amour):
2008 Chinese Control and Decision Conference (CCDC 2008) 3265
Authorized licensed use limited to: University of the Phillippines. Downloaded on July 29, 2009 at 04:28 from IEEE Xplore. Restrictions apply.

6. Design, prototype, and feasibility study. In Proceedings of
the 2005 International Conference on Robotics and
Automation (Barcelona, Apr. 2005)
[5] Smart, J.H., "Underwater Optical Communications
Systems part 2: basic design consideration" MILCOM
2005.
[6] Hiroyuki Takai, Gen’ichi Yasuda, Keihachiro Tachibana.
Development of a space-division infrared receiver for fully
distributed inter-robot communication networks. Systems,
Man and Cybernetics, 2002 IEEE International
Conference 2002
[7] Heidemann, J., Li, Y., Syed, A., Wills, J., and Ye, W.
Underwater sensor networking: Research challenges and
potential applications. Tech. Rep. ISI-TR-2005-603,
USC/Information Sciences Institute, July 2005
[8] Silonex. SLD70-BG2
[9] Luliu Vasilescu, Carrick Detweiler, Daniela Rus.
AquaNodes: An underwater sensor network. International
Conference on Mobile Computing and Networking 2007
3266 2008 Chinese Control and Decision Conference (CCDC 2008)
Authorized licensed use limited to: University of the Phillippines. Downloaded on July 29, 2009 at 04:28 from IEEE Xplore. Restrictions apply.