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Analysis of the Ocean Acoustic Channel Using M-sequences in Ocean Acoustic Tomography  

Seo, Seok (한양대학교 전자컴퓨터공학부)
Lee, Chan-Kil (한양대학교 전자컴퓨터공학부)
Publication Information
The Journal of the Acoustical Society of Korea / v.23, no.1, 2004 , pp. 24-29 More about this Journal
Abstract
In ocean acoustic tomography (OAT), the pulse compression techniques using M-sequences are employed in the many studies for investigating the ocean structures. M-sequences can provide the good time and Doppler resolution in the process of demodulation using matched-filter. The signal-to-noise (SNR) performance at the output of receiver may be improved by manipulating received signal, i. e. coherently averaging. The processing time can be significantly reduced by using fast hadarmard transform (FHT) or fast Fourier transform (FFT). In this paper, we estimate the multipath arrival structures and delay times using the East Korean Sea experiment data and explore the compensation method for the detrimental effects on performance due to sampling rate error. We also analyze the characteristics of the ocean acoustic channels through scattering function, delay power profile, and time dispersions.
Keywords
OAT; M-sequence; OAT; Phase modulation; Channel; Matched-filter;
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