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Broadening of Foci in an Ocean Time Reversal Processing and Application to Underwater Acoustic Communicaion  

Shin, Kee-Cheol (Maritime R&D Lab., LIG Nex1 Co., Ltd.)
Kim, Jea-Soo (Department of Ocean Engineering, Korea Maritime University)
Publication Information
The Journal of the Acoustical Society of Korea / v.27, no.3E, 2008 , pp. 104-111 More about this Journal
Abstract
Recently, a method for robust time reversal focusing has been introduced to extend the period of stable focusing in time-dependent ocean environments [S. Kim et al., J. Acoust. Soc. Am. 114, 145-157, (2003)]. In this study, concept of focal-size broadening based on waveguide invariant theory in an ocean time reversal acoustics is described. It is achieved by imposing the multiple location constraints. The signal vector used in multiple location constraints are found from the theory on waveguide invariant for frequency band corresponding the extended focal range. The broadening of foci in an ocean waveguide can play an important role in the application of time reversal processing, particularly to the underwater acoustic communication with moving vehicles. The proposed method is demonstrated in the context of the underwater acoustic communication from the transmit/receive array (TRA) to a slowly moving vehicle.
Keywords
Time reversal processing (TRP); Broadening of foci; Underwater acoustic communication; Multiple location constraints (MLC);
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